Hvac Service Near Me: Professional Cooling System Restoration Can Improve Your Home'S Comfort Quickly And Effectively
Common A/c Unit Problems
Is your a/c unit all of a sudden sounding like a remote thunderstorm? Or perhaps the cool breeze has turned into a faint whisper? These are timeless signs that your unit requires some severe a/c repair. Every summer, countless house owners face problems that freeze their convenience and surge their frustration.
Here's a fast rundown of the most frequent culprits behind an ailing air conditioning:
- Refrigerant Leaks-- When the coolant gets away, your a/c can't chill the air effectively.
- Unclean Filters-- A stopped up filter strangles airflow, triggering irregular cooling and higher energy expenses.
- Frozen Coils-- Ever seen ice construct up on your system? This often indicates blocked airflow or low refrigerant levels.
- Thermostat Malfunctions-- In some cases, the issue isn't the AC however the brain controlling it.
- Electrical Failures-- Faulty wiring or worn elements can cause abrupt shutdowns or irregular behavior.
Remember the last scorching day when your air conditioner offered up? It's not simply annoying; it can turn your home into an oven. However envision a group actioning in quickly, detecting the glitch with precision, and restoring your sanctuary's chill in no time. That's the kind of air conditioning unit repair service that transforms headaches into relief.
Problem | Signs | How Bold City Heating and Air Assists |
---|---|---|
Refrigerant Leakage | Warm air, hissing sounds | Professional leakage detection and exact refilling |
Filthy Filters | Weak airflow, dirty vents | Comprehensive cleansing and replacement |
Frozen Coils | Ice accumulation, no cooling | System thaw and airflow optimization |
Could a flickering thermostat be the sneaky offender taking your convenience? Or maybe an unseen electrical fault silently sabotaging your system? Bold City Heating and Air takes on these challenges head-on, guaranteeing your a/c unit hums efficiently and efficiently. - Bold City Heating and Air
Why choose unpredictable cooling when an expert touch can bring constant, refreshing air back into your life? The science of air conditioning system repair work isn't almost repairing machines-- it has to do with restoring peace of mind on the most popular days of the year.
Important Tools for Detecting and Fixing Air Conditioners
When an AC system sputters or unexpectedly stops cooling, the very first instinct may be to panic. The genuine secret lies in the precision instruments a specialist wields to identify the source quickly. Ever wonder why some specialists seem to fix complicated problems in a snap? It's all about having the right tools-- from the modest to the highly specialized
Key Instruments in the A/c Repair Toolbox
- Manifold Gauge Set: Consider this as the professional's stethoscope. It measures pressure in the refrigerant lines, revealing leakages or obstructions that invisible to the naked eye.
- Multimeter: Electrical power flows are challenging; this tool reads voltage, existing, and resistance, making sure every electrical element is humming as it should.
- Drip Detector: Identifying even the tiniest refrigerant leaks can save a system from early failure. This tool sniffs out unnoticeable gas escaping from seals or coils.
- Fin Comb: Bent fins on the condenser coil can choke airflow. An easy fin comb straightens these blades, bring back efficiency without replacing parts.
- Vacuum Pump: Before recharging refrigerant, the system often needs evacuation of air and moisture, an action crucial for durability and performance.
Why Bold City Heating and Air Excels
Bold City Heating and Air comprehends the delicate dance in between these tools and the complex machinery of your cooling system. They approach every repair with an eager eye and a well-stocked tool kit. It's not practically repairing what's broken; it's about avoiding future missteps through professional diagnosis and precision.
Pro Tips from the Field
- Always calibrate your manifold gauges before use; a tiny mistake in pressure reading can result in misdiagnosis.
- Do not ignore the importance of a clean workplace-- dust and particles can toss off sensitive electrical readings.
- When dealing with refrigerant, security is critical. Use gloves and safety glasses, and guarantee correct ventilation.
- Use a thermal imaging video camera to find hotspots or cold spots in wiring and coils that may not be noticeable otherwise.
Could there be a more interesting blend of science and craft than the tools utilized in air conditioner repair? Each tool tells a story, and with Bold City Heating and Air, that story is always one of swift, effective solutions and restored convenience.
Dissecting the Heart of Your Air Conditioning System
Ever wondered what really takes place when your air conditioning unit repair kicks off? It's not almost slapping on a new filter or completing refrigerant. The true art depends on an organized, careful detailed repair work process that Bold City Heating and Air has actually mastered. They understand that each unit narrates-- in some cases a whisper of a defective capacitor, other times a shout from a stopped up condenser coil.
Step 1: Diagnostic Deep Dive
The procedure begins with a comprehensive diagnostic that digs underneath surface area symptoms. Is the unit blowing warm air? Is there an unusual noise, like a ghost in the device? Bold City professionals use sophisticated tools to measure electrical currents, refrigerant levels, and airflow patterns. This isn't uncertainty-- it's accuracy.
Step 2: Identifying the Origin
Once the diagnostic puzzle is complete, the real offender emerges (Bold City Heating and Air). Could it be a compressor having a hard time against low refrigerant? Or a thermostat that's lost its marbles? Bold City Heating and Air masters recognizing the precise part causing the hiccup, avoiding unneeded part replacements
Step 3: Tactical Repair Execution
- Power down the system securely to prevent any shocks or damage.
- Remove and examine the malfunctioning part-- whether it's a fan motor, capacitor, or evaporator coil.
- Perform accurate repairs or replacements utilizing OEM-equivalent parts.
- Reassemble the unit making sure all connections are tight and sealed.
Step 4: Strenuous Performance Screening
After repair work, the unit goes through a battery of tests. Bold City Heating and Air does not just switch it on; they measure temperature differentials and airflow rates to confirm ideal energy performance. This action guarantees your system won't just run-- it'll glide through the blistering days like a breeze.
Pro Tips from the Trenches
- Check the condenser coil regularly-- dust and debris can turn a cool maker into a sweatbox.
- Listen for humming or clicking sounds. These subtle signals typically precede bigger failures.
- Watch on your unit's cycle duration; abnormally brief or long cycles may hint at underlying concerns.
Identifying the Silent Strain: Why Preventive Upkeep Matters
Ever seen how an ac system can suddenly sputter and sigh, as if gasping for breath in the thick summer heat? The reality is, a clogged air filter or a neglected coil can calmly stealth their method into your system, leading to ineffective cooling and unexpected breakdowns. Bold City Heating and Air recognizes these subtle whispers of distress before they escalate into full-blown breakdowns, comprehending that each skipped tune-up inches your system better to failure.
Expert Tips to Keep Your Air Conditioner in Top Shape
- Tidy or Replace Filters Regular Monthly: Dust and particles aren't just annoyances-- they choke air flow and force your compressor to overexert.
- Check the Refrigerant Levels: Low refrigerant can turn your cooling dreams into a lukewarm headache, sapping energy and straining elements.
- Examine Electrical Links: Loose wires or rusty contacts may trigger unexpected blackouts or fire risks.
- Clear the Condensate Drain: Obstructions here welcome water damage and mold growth, quietly undermining your system's health.
Why Regimen Tune-Ups Are a Game-Changer
Think about your air conditioner like a finely tuned instrument. Without routine adjustments, it falls out of harmony, developing discord in your house's comfort. Bold City Heating and Air dives deep, not simply skimming surface areas but carefully inspecting every nook-- from the evaporator coils to the blower motor. This proactive stance avoids the surprise of system failures throughout the most popular days, turning prospective catastrophes into simple footnotes.
Upkeep Job | Frequency | Benefit | |
---|---|---|---|
Filter Cleaning/Replacement | Every 1 month | Enhances air quality & & performance Refrigerant Level Examine | |
Every year Prevents compressor pressure Electrical Examination Annually Ensures safety & reliability Condenser | Coil Cleansing Yearly Increases | cooling efficiency Why await a sputtering unit to scream for help? Resolving these vital points early transforms your air conditioner from | a ticking time bomb into a fortress |
of consistent coolness. Bold City Heating and Air does not simply repair-- they anticipate, adapting their knowledge to the distinct needs your system deals with. Keep in mind, on the planet of air conditioner repair, insight is your coolest ally. Expert Cooling Solutions in Jacksonville, FL Jacksonville, FL, is the largest city by land location in the adjoining United States and boasts a population that makes it a vibrant city center in
Northeast Florida. Understood for its substantial park system,
lovely Atlantic beaches, and a dynamic riverfront, Jacksonville provides a distinct blend of urban and outdoor way of life. The city is likewise a hub for commerce, culture, and sports, hosting several professional sports teams and various cultural festivals throughout the year. If you need support with air conditioning system repair, they encourage you to connect to Bold City Heating and Air for a free assessment and specialist advice customized to your cooling needs.
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- Timuquana: Timuquana is a living neighborhood located in Jacksonville FL, known for its quiet streets and local parks. It offers a variety of detached houses and easy access to nearby amenities and schools.
- San Jose Forest: San Jose Forest is a housing neighborhood located in Jacksonville, Florida, known for its lush greenery and family-friendly atmosphere. The area features a mix of single-family homes and local parks, offering a serene suburban environment.
- E-Town: E-Town is a dynamic neighborhood located in Jacksonville, Florida, known for its diverse community and historical significance. It features a combination of residential areas, local businesses, and cultural landmarks that contribute to its unique character.
- Cummer Museum of Art and Gardens: The Cummer Museum of Art and Gardens showcases a varied collection of art encompassing different periods and cultures. Guests can also wander lovely formal gardens with views of the St. Johns River in Jacksonville FL.
- Jacksonville Zoo and Gardens: Jacksonville Zoo and Gardens presents a varied collection of animals and flora from across the world. It provides engaging displays, instructive programs, and preservation initiatives for guests of all ages. Jacksonville FL
- Museum of Science and History: This Museum of Science & History in Jacksonville FL showcases hands-on exhibits and a planetarium suitable for all ages. Visitors can explore science, history, and culture through engaging displays and informative programs.
- Kingsley Plantation: Kingsley Plantation is a historical site that offers a glimpse into Florida plantation history, including the lives of enslaved people and the planter family. Visitors can investigate the grounds, such as the slave quarters, plantation house, and barn. Jacksonville FL
- Fort Caroline National Memorial: Fort Caroline National Memorial honors the 16th-century French endeavor to establish a colony in Florida. It provides displays and trails investigating the history and natural environment of the area in Jacksonville FL.
- Timucuan Ecological and Historic Preserve: Timucuan Ecological and Historic Preserve protects one of the remaining pristine coastal marshes on the Atlantic Coast. It preserves the history of the Timucuan Indians, European explorers, and plantation owners.
- Friendship Fountain: Friendship Fountain is a big, well-known water fountain in Jacksonville FL. It showcases striking water displays and lights, making it a well-liked attraction and place to gather.
- Riverside Arts Market: Riverside Arts Market in Jacksonville FL, is a vibrant week-to-week arts and crafts marketplace under the Fuller Warren Bridge. It showcases regional craftspeople, live music, food sellers, and a gorgeous view of the St. Johns River.
- San Marco Square: San Marco Square is a charming retail and eating district with a European-inspired ambiance. It is renowned for its exclusive boutiques, restaurants, and the famous fountain with lions. Jacksonville FL
- St Johns Town Center: St. Johns Town Center is an upscale open-air shopping mall in Jacksonville FL, offering a selection of luxury stores, well-known brands, and restaurants. It's a leading destination for shopping, dining, and recreation in North East Florida.
- Avondale Historic District: Avondale Historic District presents charming early 20th-century architecture and boutique shops. It's a dynamic neighborhood known for its local restaurants and historic character. Jacksonville FL
- Treaty Oak Park: Treaty Oak Park is a gorgeous park in Jacksonville FL, home to a huge, ancient oak tree. The park provides a calm escape with trails and picturesque views of the St. Johns River.
- Little Talbot Island State Park: Little Talbot Island State Park in Jacksonville FL offers immaculate shores and diverse habitats. Visitors can enjoy recreation like hiking, camping, and observing wildlife in this natural coastal setting.
- Big Talbot Island State Park: Big Talbot Island State Park in Jacksonville FL, provides breathtaking coastal scenery and diverse ecosystems for outdoor lovers. Discover the one-of-a-kind boneyard beach, hike picturesque trails, and watch plentiful wildlife in this lovely natural sanctuary.
- Kathryn Abbey Hanna Park: Kathryn Abbey Hanna Park in Jacksonville FL, provides a beautiful beach, wooded trails, and a 60-acre fresh water lake for recreation. It is a favored place for camping, surfing, kayaking, and biking.
- Jacksonville Arboretum and Gardens: Jacksonville Arboretum and Gardens offers a beautiful ecological getaway with varied paths and specialty gardens. Visitors can explore a range of plant life and enjoy peaceful outdoor recreation.
- Memorial Park: Memorial Park is a 5.25-acre park that acts as a tribute to the over 1,200 Floridians who gave their lives in World War I. The area features a statue, reflecting pool, and gardens, offering a place for remembrance and thought. Jacksonville FL
- Hemming Park: Hemming Park is Jacksonville FL's most ancient park, a historic open square holding events, markets, and social gatherings. It provides a green space in the center of downtown with art exhibits and a lively ambiance.
- Metropolitan Park: Metropolitan Park in Jacksonville FL offers a lovely riverfront setting for occasions and leisure. With play areas, a concert venue, and picturesque vistas, it's a favorite destination for locals and tourists alike.
- Confederate Park: Confederate Park in Jacksonville FL, was originally named to pay tribute to Confederate soldiers and sailors. It has since been redesignated and re-purposed as a place for local events and recreation.
- Beaches Museum and History Park: Beaches Museum & History Park safeguards and relays the unique history of Jacksonville's beaches. Investigate exhibits on nearby life-saving, surfing, and initial beach communities.
- Atlantic Beach: The city of Atlantic Beach offers a charming coastal area with gorgeous beaches and a calm atmosphere. People can enjoy surfing, swimming, and exploring local shops and restaurants near Jacksonville FL.
- Neptune Beach: The city of Neptune Beach provides a typical Florida beach town experience with its sandy shores and laid-back atmosphere. People can enjoy surfing, swimming, and exploring nearby shops and restaurants in Jacksonville FL.
- Jacksonville Beach: Jacksonville Beach is a lively shoreline city known because of its sandy shores and surfing scene. It offers a mix of leisure activities, dining, and nightlife beside the Atlantic Ocean.
- Huguenot Memorial Park: Huguenot Memorial Park provides a stunning beachfront location with opportunities for campgrounds, fishing, and birdwatching. Visitors can enjoy the natural allure of the area with its diverse wildlife and scenic coastal views in Jacksonville FL.
- Castaway Island Preserve: Castaway Island Preserve in Jacksonville FL, offers picturesque paths and walkways through varied habitats. Guests can enjoy walks in nature, bird watching, and exploring the beauty of the shoreline area.
- Yellow Bluff Fort Historic State Park: Yellow Bluff Fort Historic State Park in Jacksonville FL safeguards the dirt remnants of a Civil War-era Southern fort. Visitors can explore the historical location and discover about its meaning through informative exhibits.
- Mandarin Museum & Historical Society: The Mandarin Museum & Historical Society protects the past of the Mandarin neighborhood within Jacksonville FL. Guests can discover displays and artifacts that showcase the area's distinctive history.
- Museum of Southern History: The Museum of Southern History exhibits artifacts and exhibits connected to the history and culture of the Southern United States. Visitors are able to delve into a variety of topics, such as the Civil War, slavery, and Southern art and literature. Jacksonville FL
- The Catty Shack Ranch Wildlife Sanctuary: The Catty Shack Ranch Wildlife Sanctuary in Jacksonville FL, offers guided walking tours to view rescued big cats and other uncommon animals. It's a not-for-profit organization committed to providing a secure, loving, forever home for these animals.
- Air Conditioning Installation: Proper installation of cooling systems assures effective and pleasant indoor climates. This important process assures peak performance and lifespan of climate control units.
- Air Conditioner: Air Conditioners cool indoor spaces by extracting heat and moisture. Proper setup by certified technicians ensures efficient performance and optimal climate control.
- Hvac: Hvac systems govern temperature and air's condition. They are crucial for creating environmental control answers in buildings.
- Thermostat: The Thermostat is the primary component for managing temperature in HVAC systems. It signals the cooling unit to turn on and off, keeping the desired indoor environment.
- Refrigerant: Refrigerant is vital for temperature control systems, absorbing heat to produce cool air. Proper management of refrigerants is vital during HVAC installation for efficient and safe operation.
- Compressor: This Compressor is the component of your cooling system, pumping refrigerant. The process is key for efficient temperature control in climate control systems.
- Evaporator Coil: An Evaporator Coil takes in heat from inside air, bringing it down. This part is critical for efficient climate control system installation in buildings.
- Condenser Coil: The Condenser Coil is an integral component in cooling systems, dissipating heat outside. It promotes the heat transfer needed for effective indoor climate management.
- Ductwork: Ductwork is vital for dispersing treated air around a building. Proper duct planning and installation are vital for effective climate regulation system positioning.
- Ventilation: Effective Ventilation is crucial for adequate air flow and indoor air standard. It has a critical role in ensuring peak operation and efficiency of climate control equipment.
- Heat Pump: Heat Pumps move heat, providing both heating and cooling. They're essential parts in modern climate control system installations, offering energy-efficient temperature regulation.
- Split System: Split systems offer both cooling and heating through an indoor unit connected to an outdoor compressor. They offer a ductless solution for temperature regulation in certain rooms or areas.
- Central Air Conditioning: Central air conditioning systems cool entire homes from a sole, potent unit. Proper setup of these systems is vital for efficient and functional home chilling.
- Energy Efficiency Ratio: Energy Efficiency Ratio measures cooling efficiency: higher Energy Efficiency Ratio shows improved operation and reduced energy consumption for climate control systems. Choosing a unit with a good Energy Efficiency Ratio can significantly lower long-term costs when installing a new climate control system.
- Variable Speed Compressor: Variable Speed Compressors adjust cooling production to meet need, enhancing efficiency and comfort in HVAC systems. This precise modulation lowers power waste and maintains uniform temperatures in indoor environments.
- Compressor Maintenance: Maintaining compressors ensures efficient operation and lifespan in refrigeration systems. Ignoring it can lead to costly repairs or system breakdowns when establishing climate control.
- Air Filter: Air Filter trap dust and debris, making sure of clean air flow within HVAC systems. This enhances system efficiency and indoor air condition during temperature regulation setup.
- Installation Manual: The Installation Manual gives key direction for appropriately installing a cooling system. It assures correct steps are used for peak performance and safety during the unit's setup.
- Electrical Wiring: Electrical Wiring is critical for supplying power to and controlling the parts of climate control systems. Suitable wiring assures safe and effective functioning of the cooling and heating units.
- Indoor Unit: Indoor Unit moves conditioned air within a space. It's a key part for HVAC systems, making sure of suitable temp control in buildings.
- Outdoor Unit: The Outdoor Unit houses the compressor and condenser, releasing heat externally. It's essential for a complete climate control system installation, ensuring effective cooling inside.
- Maintenance: Regular upkeep ensures efficient performance and extends the lifespan of climate control systems. Proper Maintenance averts failures and improves the efficiency of installed cooling systems.
- Energy Efficiency: Energy Efficiency is crucial for reducing energy use and costs when setting up new climate control systems. Prioritizing effective equipment and correct installation minimizes environmental effect and increases long-term savings.
- Thermodynamics: Thermodynamics explains how heat transfers and converts energy, crucial for cooling system system. Efficient climate control creation relies on Thermodynamics principles to optimize energy use during setup location.
- Building Codes: Construction regulations guarantee suitable and safe HVAC system setup in buildings. They control aspects such as energy efficiency and air flow for climate control systems.
- Load Calculation: Load Calculation establishes the warming and cooling requirements of a room. It's essential for choosing suitably sized HVAC equipment for effective environmental control.
- Mini Split: Mini Splits offer a no-duct approach to temperature management, providing targeted heating and cooling. Their simple installation renders them suitable for spaces where adding ductwork for climate modification is impractical.
- Air Handler: An Air Handler circulates treated air around a building. It is a crucial component for proper climate control system setup.
- Insulation: Insulation is essential for keeping efficient temperature regulation within a building. It minimizes heat transfer, lessening the workload on cooling systems and optimizing climate control setups.
- Drainage System: Drainage Systems eliminate condensate created by air conditioning equipment. Proper drainage avoids water damage and ensures efficient operation of climate control setups.
- Filter: Strainers are critical parts that eliminate pollutants from the air throughout the installation of climate control systems. This ensures cleaner air flow and protects the system's internal components.
- Heating Ventilation And Air Conditioning: Heating Ventilation And Air Conditioning systems control indoor climate by regulating temperature, humidity, and air quality. Proper setup of these systems guarantees economical and effective cooling and environmental control within buildings.
- Split System Air Conditioner: Split system air conditioners offer efficient cooling and heating by separating the compressor and condenser from the air handler. Their design simplifies the procedure of establishing climate control in residences and businesses.
- Hvac Technician: Hvac Technicians are skilled experts who focus in the configuration of climate control systems. They ensure correct operation and efficiency of these systems for maximum indoor well-being.
- Indoor Air Quality: Indoor Air Quality significantly affects comfort and health, so HVAC system setup should emphasize filtration and ventilation. Appropriate system planning and setup is essential for optimizing air quality.
- Condensate Drain: This Condensate Drain removes water created throughout the cooling operation, stopping damage and keeping system effectiveness. Correct drain assembly is crucial for successful climate control device and long-term performance.
- Variable Refrigerant Flow: Variable Refrigerant Flow (VRF) systems accurately regulate refrigerant volume to different zones, offering tailored cooling and heating. This technology is vital for establishing effective and flexible climate control in building environments.
- Building Automation System: Building automation systems orchestrate and optimize the functioning of HVAC equipment. This results in enhanced temperature regulation and power savings in buildings.
- Air Conditioning: HVAC systems regulate indoor temperature and air quality. Proper installation of these systems is vital for efficient and effective Air Conditioning.
- Temperature Control: Precise temperature control is essential for efficient climate control system setup. It guarantees optimal performance and comfort in newly installed cooling systems.
- Thermistor: Temperature-sensitive resistors are temperature-sensitive resistors used in weather control systems to measure accurately air temperature. This data helps to control system operation, guaranteeing optimal performance and energy efficiency in environmental control arrangements.
- Thermocouple: Temperature sensors are devices essential for assuring proper HVAC system setup. They accurately gauge temperature, allowing precise modifications and peak climate control performance.
- Digital Thermostat: These devices precisely control temperature, optimizing HVAC system operation. They are essential for establishing home climate regulation systems, guaranteeing effective and comfortable environments.
- Programmable Thermostat: Programmable Thermostats improve climate control systems by allowing personalized temperature schedules. This results in enhanced energy efficiency and comfort in residential AC setups.
- Smart Thermostat: Clever thermostat improve house climate control by learning user desires and changing temperatures on their own. They play a vital role in modern HVAC system setups, enhancing energy savings and comfort.
- Bimetallic Strip: A Bimetallic Strip, made up of two metals with different expansion rates, bends in reaction to temperature changes. This property is used in HVAC systems to operate thermostats and regulate heating or cooling operations.
- Capillary Tube Thermostat: The Capillary Tube Thermostat precisely controls temperature in cooling systems via remote sensing. The component is essential for maintaining desired climate control within buildings.
- Thermostatic Expansion Valve: This Thermostatic Expansion Valve controls refrigerant flow into the evaporator, keeping ideal cooling. This component is critical for effective operation of refrigeration and air conditioning systems in buildings.
- Setpoint: Setpoint is the desired temperature a climate management system aims to reach. It guides the system's performance during climate management configurations to maintain preferred comfort levels.
- Temperature Sensor: Temperature sensing devices are vital for adjusting warming, air flow, and air conditioning systems by observing air temperature and guaranteeing efficient climate control. Their data helps optimize system performance during climate control installation and maintenance.
- Feedback Loop: A Feedback Loop assists with controlling temperature during climate control system installation by continuously monitoring and adjusting settings. This guarantees optimal performance and energy efficiency of installed residential cooling.
- Control System: Control Systems govern temperature, moisture, and airflow in air conditioning setups. These systems ensure optimal comfort and energy savings in temperature-controlled environments.
- Thermal Equilibrium: Thermal Equilibrium is achieved when components attain the same temperature, vital for effective climate control system setup. Proper balance guarantees optimal performance and energy savings in installed cooling systems.
- Thermal Conductivity: Thermal Conductivity dictates how efficiently materials conduct heat, impacting the cooling system setup. Choosing materials with fitting thermal properties guarantees optimal performance of installed climate control systems.
- Thermal Insulation: Thermal insulation minimizes heat transfer, assuring efficient cooling by lessening the workload on climate control systems. This improves energy efficiency and keeps consistent temperatures in buildings.
- On Off Control: On Off Control keeps wanted temperatures by fully activating or deactivating cooling systems. This simple method is vital for regulating temperature within buildings throughout environmental control system installation.
- Pid Controller: PID controllers accurately regulate temps in HVAC systems. This makes sure effective climate control during building temperature setup and functioning.
- Evaporator: The Evaporator takes in heat from within a space, cooling the air. This is a vital component in climate control systems designed for indoor comfort.
- Condenser: This Condenser unit is a essential component in cooling systems, rejecting heat extracted from the indoor space to the outside environment. Its accurate setup is important for effective climate control system placement and performance.
- Chlorofluorocarbon: Chlorofluorocarbons have been previously common refrigerants that facilitated cooling in numerous building systems. Their role has decreased due to environmental concerns about ozone depletion.
- Hydrofluorocarbon: Hydrofluorocarbon are refrigerants commonly used in cooling systems for buildings and vehicles. Their proper handling is vital during the installation of environmental control systems to prevent environmental harm and assure effective operation.
- Hydrochlorofluorocarbon: Hydrochlorofluorocarbons were once widely used coolants in HVAC systems for buildings. Their phase-out has caused the implementation of more eco-friendly options for new HVAC systems.
- Global Warming Potential: Global Warming Potential (GWP) shows how much a certain mass of greenhouse gas adds to global warming over a specified period relative to carbon dioxide. Selecting refrigerants with less GWP is key when setting up climate control systems to lessen environmental impact.
- Ozone Depletion: Ozone Depletion from refrigerants poses environmental dangers. Technicians servicing cooling units must follow regulations to prevent further damage.
- Phase Change: Phase Change of refrigerants are vital for efficiently moving heat in climate control systems. Evaporation and condensation processes enable cooling by absorbing heat indoors and releasing it outdoors.
- Heat Transfer: Heat Transfer principles are vital for efficient climate control system setup. Grasping conduction, convection, and radiation ensures peak system performance and energy efficiency during the process of installing home cooling.
- Refrigeration Cycle: The cooling process moves heat, enabling cooling in climate-control systems. Correct installation and upkeep make sure of efficient operation and longevity of these refrigeration solutions.
- Environmental Protection Agency: EPA regulates refrigerants and sets standards for HVAC system servicing to protect the ozone layer and reduce greenhouse gas emissions. Technicians handling cooling equipment must be certified to ensure proper refrigerant handling and prevent environmental damage.
- Leak Detection: Leak Detection assures the integrity of refrigerant pipes after climate control system placement. Identifying and addressing leaks is crucial for peak function and ecological safety of newly installed climate control systems.
- Pressure Gauge: Pressure Gauge are vital tools for monitoring refrigerant levels during HVAC system installation. They ensure optimal performance and prevent damage by verifying pressures are within defined ranges for proper cooling operation.
- Expansion Valve: This Expansion Valve governs refrigerant flow in cooling systems, allowing for efficient heat uptake. It's a vital component for maximum performance in environmental control setups.
- Cooling Capacity: Cooling Capacity determines how well a system can reduce the temperature of a room. Selecting the right capacity is crucial for optimal performance in placement of environmental control systems.
- Refrigerant Recovery: Refrigerant Recovery is the procedure of removing and keeping refrigerants during HVAC system setups. Properly recovering refrigerants stops environmental damage and ensures effective new cooling equipment placements.
- Refrigerant Recycling: Refrigerant Recycling reclaims and recycles refrigerants, lessening environmental impact. This procedure is essential when setting up climate control systems, guaranteeing responsible handling and preventing ozone depletion.
- Safety Data Sheet: Safety Data Sheets (SDS) supply crucial information on the safe handling and potential hazards of chemicals utilized in cooling system setup. Technicians use SDS data to protect themselves and prevent accidents during HVAC equipment placement and connection.
- Synthetic Refrigerant: Synthetic Refrigerants are vital liquids utilized in refrigeration systems to transfer heat. Their correct handling is essential for effective climate control setup and maintenance.
- Heat Exchange: Heat Exchange is crucial for chilling buildings, enabling effective temperature regulation. It's a key process in climate control system setup, assisting the transfer of heat to offer comfortable indoor spaces.
- Cooling Cycle: Cooling Cycle is the fundamental procedure of heat extraction, utilizing refrigerant to take in and release heat. This process is critical for effective climate control system setup in buildings.
- Scroll Compressor: Scroll compressors effectively compress refrigerant for cooling systems. They are a critical component for efficient temperature regulation in buildings.
- Reciprocating Compressor: Reciprocating pumps are vital parts that compress refrigerant in refrigeration systems. They aid heat transfer , enabling effective climate control within structures.
- Centrifugal Compressor: Centrifugal Compressors are critical parts that boost refrigerant stress in big climate control systems. They efficiently circulate refrigerant, enabling efficient cooling and heating throughout extensive areas.
- Rotary Compressor: Rotary Compressor are a major component in cooling systems, employing a rotating mechanism to compress refrigerant. Their effectiveness and reduced size make them suitable for climate control setups in diverse applications.
- Compressor Motor: This Compressor Motor serves as the main force for the refrigeration process, moving refrigerant. It is crucial for proper climate control system setup and operation in buildings.
- Compressor Oil: Compressor Oil lubricates and seals mechanical parts inside a systems' compressor, ensuring effective refrigerant compression for suitable climate control. It is crucial to select the correct type of oil during system setup to guarantee longevity and peak function of the cooling appliance.
- Pressure Switch: A Pressure Switch checks refrigerant stages, guaranteeing the system operates safely. It prevents harm by shutting down the cooling apparatus if pressure drops beyond the ok range.
- Compressor Relay: The Compressor Relay is an electrical device that manages the compressor motor in cooling systems. It guarantees the compressor begins and ceases properly, allowing effective temperature control within climate control setups.
- Suction Line: The Suction Line, a vital part in cooling systems, transports refrigerant vapor from the evaporator to the compressor. Correct sizing and insulation of this line are essential for effective system operation during climate control setup.
- Discharge Line: This discharge line transports hot, high-pressure refrigerant gas from the compressor to the condenser. Proper dimensioning and setup of the discharge line are crucial for ideal cooling system configuration.
- Compressor Capacity: Compressor Capacity dictates the cooling power of a system for indoor temperature control. Choosing the right size ensures effective temperature regulation during climate control setup.
- Cooling Load: Cooling Load is the volume of heat that needs to be removed from a space to keep a desired temperature. Accurate cooling load calculation is important for proper HVAC system installation and size.
- Air Conditioning Repair: Air Conditioning Repair ensures systems function optimally after they are installed. It's vital for maintaining effective climate control systems put in place.
- Refrigerant Leak: Refrigerant Leakage reduce cooling efficiency and can cause equipment malfunction. Fixing these leaks is essential for appropriate climate control system configuration, guaranteeing optimal performance and durability.
- Seer Rating: SEER score represents an HVAC system's refrigeration performance, affecting long-term energy costs. Elevated SEER values mean greater energy savings when setting up climate control.
- Hspf Rating: HSPF rating demonstrates the heating efficiency of heat pumps. Increased ratings mean better energy efficiency during climate control installation.
- Preventative Maintenance: Preventative Maintenance guarantees HVAC systems work effectively and dependably after setup. Regular upkeep lessens breakdowns and extends the lifespan of climate control setups.
- Airflow: Airflow ensures efficient cooling and heating distribution across a building. Correct Airflow is essential for peak operation and comfort in climate control systems.
- Electrical Components: Electrical Components are critical for energizing and managing systems that regulate indoor temperature. They assure correct performance, safety, and effectiveness in temperature regulation systems.
- Refrigerant Charging: Refrigerant Charging is the procedure of introducing the right quantity of refrigerant to a cooling system. This assures best performance and effectiveness when installing climate control units.
- System Diagnosis: The System Diagnosis process identifies possible problems prior to, while, and following HVAC system installation. It guarantees peak performance and averts future problems in climate control setups.
- Hvac System: HVAC systems govern temperature, humidity, and air quality in buildings. They are vital for setting up climate-control solutions in residential and business spaces.
- Ductless Air Conditioning: Ductless systems offer targeted temperature control without extensive ductwork. They make easier temperature control setup in rooms that lack existing duct systems.
- Window Air Conditioner: Window air conditioners are standalone units placed in windows to cool individual spaces. They offer a simple way for specific climate control within a building.
- Portable Air Conditioner: Portable AC units provide a flexible cooling solution for spaces without central systems. They can also offer temporary temperature regulation during HVAC system setups.
- System Inspection: System Inspection ensures correct setup of cooling systems by confirming part condition and compliance to installation standards. This procedure assures efficient operation and avoids future malfunctions in climate control setups.
- Coil Cleaning: Coil Cleaning ensures effective heat transfer, vital for peak system performance. This maintenance procedure is essential for proper setup of climate control systems.
- Refrigerant Recharge: Refrigerant Recharge is essential for reinstating chilling capacity in air conditioning units. It assures optimal operation and lifespan of recently installed temperature regulation devices.
- Capacitor: Capacitors provide the needed energy boost to start and operate motors inside of climate control systems. Their proper function guarantees effective and dependable operation of the cooling unit.
- Contactor: The Contactor serves as an electrical switch which controls power to the outdoor unit's components. It allows the cooling system to activate when necessary.
- Blower Motor: The Blower Motor moves air via the ductwork, allowing for efficient heating and cooling distribution within a building. It's a key component for indoor climate control systems, guaranteeing stable temperature and airflow.
- Overheating: Overheating can severely hamper the functionality of recently installed climate control systems. Technicians must resolve this issue to guarantee efficient and reliable cooling operation.
- Troubleshooting: Fixing identifies and resolves problems that arise during climate control system setup. Effective fixing ensures optimal system performance and prevents later problems during building cooling appliance fitting.
- Refrigerant Reclaiming: Refrigerant Reclaiming retrieves and reprocesses used refrigerants. This procedure is essential for environmentally responsible HVAC system installation.
- Global Warming: Global Warming increases the demand or for cooling systems, requiring demanding more frequent setups installations. This heightened increased need drives fuels innovation in energy-efficient power-saving climate control solutions options.
- Montreal Protocol: This Montreal Protocol phases out ozone-depleting materials utilized in cooling systems. This shift requires using alternative refrigerants in new environmental control setups.
- Greenhouse Gas: Greenhouse gases trap warmth, affecting the energy efficiency and environmental footprint of climate control system configurations. Selecting refrigerants with lower global warming potential is vital for sustainable weather control execution.
- Cfc: CFCs were once essential refrigerants in cooling systems for buildings and vehicles. Their use has been phased out due to their damaging impact on the ozone layer.
- Hcfc: Hcfc were once common refrigerants used in cooling systems for structures and vehicles. They eased the process of setting up climate control systems, but are now being phased out due to their ozone-depleting properties.
- Hfc: HFCs are frequently used refrigerants in refrigeration systems for buildings. Their appropriate handling is essential during the installation of these systems to reduce environmental impact.
- Refrigerant Oil: Refrigerant oil lubricates the pump in refrigeration units, ensuring seamless operation and longevity. It's crucial for the proper function of cooling setups.
- Phase-Out: Phase-out refers to the gradual elimination of certain refrigerants with elevated global warming capacity. This impacts the selection and maintenance of climate control systems in buildings.
- Gwp: GWP indicates a refrigerant's potential to heat the planet if discharged. Lower GWP refrigerants are progressively favored in eco-friendly HVAC system setups.
- Odp: Odp refrigerants harm the ozone layer, influencing regulations for refrigeration system setup. Installers must use ozone-friendly alternatives during HVAC equipment installation.
- Ashrae: Ashrae defines criteria and recommendations for HVAC system installation. The standards assure optimized and safe environmental control system application in buildings.
- Hvac Systems: Hvac Systems provide temperature and air condition control for indoor environments. They are critical for establishing cooling setups in buildings.
- Refrigerant Leaks: Refrigerant Leaks lower cooling system effectiveness and can harm the environment. Correct procedures during climate control unit installation are vital to prevent these leaks and guarantee optimal performance.
- Hvac Repair Costs: Hvac Repair Costs can greatly influence decisions about switching to a new temperature system. Unexpected repair costs may encourage homeowners to invest in a complete home comfort setup for future savings.
- Hvac Installation: Hvac Installation includes installing warming, ventilation, and air conditioning units. This is essential for enabling effective climate control inside structures.
- Hvac Maintenance: Hvac Maintenance ensures effective operation and prolongs system life. Appropriate upkeep is essential for smooth climate control system setups.
- Hvac Troubleshooting: Hvac Troubleshooting pinpoints and fixes problems in heating, ventilation, and cooling systems. It ensures peak performance during climate control unit installation and operation.
- Zoning Systems: Zoning Systems split a building into individual areas for customized temperature regulation. This method optimizes comfort and energy efficiency during HVAC installation.
- Compressor Types: Different Compressor Types are critical parts for effective climate control systems. Their selection significantly impacts system effectiveness and performance in environmental comfort uses.
- Compressor Efficiency: Compressor Efficiency is vital, determining how efficiently the system cools a room for a given energy input. Optimizing this efficiency directly impacts cooling system installation costs and long-term operational expenses.
- Compressor Overheating: Compressor Overheating can severely damage the device's core, resulting in system malfunction. Proper installation ensures adequate air flow and refrigerant amounts, preventing this problem in climate control system placements.
- Compressor Failure: Compressor malfunction halts the cooling process, needing expert service during climate control system setups. A defective compressor compromises the entire system's efficiency and lifespan when incorporating it into a building.
- Overload Protector: An safeguards the compressor motor from overheating during climate control system installation. It prevents harm by automatically shutting off power when too much current or temperature is detected.
- Fan Motor: Fan motors move air through evaporator and condenser coils, a vital process for effective climate control system installation. They facilitate heat exchange, ensuring peak cooling and heating operation within the designated space.
- Refrigerant Lines: Refrigerant Lines are essential components that join the inside and outside units, circulating refrigerant to help cooling. Their correct installation is essential for streamlined and productive climate control system setup.
- Condensing Unit: The Condensing Unit is the outside component in a cooling system. The unit rejects heat from the refrigerant, allowing indoor temperature control.
- Heat Rejection: Heat Rejection is vital for refrigeration systems to efficiently remove unwanted heat from a cooled area. Correct Heat Rejection guarantees optimal performance and longevity of climate control setups.
- System Efficiency: System Efficiency is essential for reducing energy use and operational expenses. Optimizing efficiency during climate control setup guarantees long-term savings and environmental benefits.
- Pressure Drop: Pressure decrease is the reduction in fluid pressure as it moves through a system, affecting airflow in environmental control setups. Properly managing pressure decrease is essential for peak performance and effectiveness in climate control systems.
- Subcooling: Subcooling process assures best equipment operation by cooling the refrigerant below its condensing temperature. This action stops flash gas, maximizing refrigeration power and efficiency throughout HVAC equipment installation.
- Superheat: Superheat makes sure that just vapor refrigerant goes into the compressor, preventing damage. It's crucial to measure superheat during HVAC system installation to optimize cooling capabilities and efficiency.
- Refrigerant Charge: Refrigerant Charge is the quantity of refrigerant in a system, crucial for best cooling performance. Proper filling guarantees effective heat transfer and avoids damage during climate control setup.
- Corrosion: Rust impairs metallic parts, likely leading to leaks and system malfunctions. Guarding against Corrosion is vital for keeping the effectiveness and lifespan of climate control systems.
- Fins: Blades increase the surface area of coils, enhancing heat transfer efficiency. This is vital for optimal performance in climate control system setups.
- Copper Tubing: Copper piping is crucial for refrigerant transport in HVAC systems because of its robustness and effective heat transfer. Its trustworthy connections guarantee suitable system operation during installation of thermostat units.
- Aluminum Tubing: Aluminum piping is vital for conveying refrigerant in HVAC systems. Their light and rustproof properties render them ideal for linking internal and external units in HVAC setups.
- Repair Costs: Sudden maintenance can significantly impact the overall expense of setting up a new climate control system. Budgeting for potential Repair Costs ensures a more accurate and comprehensive cost assessment when implementing such a system.
Bold City Heating & Air
4.9(1,687)
Air conditioning repair service·
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8400 Baymeadows Way Suite 1, Jacksonville, FL 32256, United States
Open 24 hours
+1 904-379-1648
6C9C+2H Baymeadows Center, Jacksonville, FL, USA
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That Florida sun? It doesn’t play. Prepping your HVAC system now means cool breezes later. Clean filters ✔️ Check refrigerant ✔️ Program thermostats ✔️ 🔥 Be heatwave-ready with Bold City Heating & Air! Book your seasonal check-up and beat the summer rush!
3 days ago
Updates from customers
Randolph and the crew were so nice and they did a AWESOME Job of putting in new ductwork & installation. Great group of guys. RT would answer any questions you had. Felt comfortable with them in my home. From the girl at the front desk to everyone involved Thank You!! I Appreciate you all. I definitely would recommend this company to anyone 😊
a year ago
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Why would an AC heater not be turning on?
An AC heater may not turn on due to power issues like tripped circuit breakers, blown fuses, or loose wiring, thermostat problems such as dead batteries, incorrect settings, or a faulty unit, or safety features engaging due to clogged filte …
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4.9
1,687 reviews
"Best price and service I have ever had with an HVAC partner"
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Abe Fernandez
11 reviews · 11 photos
a week ago
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DO NOT HIRE THIS COMPANY. TOOK THEM TO COURT AND WON!
We hired Bold City Heating and Air to replace all our air ducts, and the work they performed was shockingly defective. After the job was done we noticed that … More
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Kenneth Jefferson
5 reviews · 3 photos
2 months ago
Jacob; Ben & Josie were very professional and efficient. If I could give 10 stars I would. Very knowledgeable and they kept me informed throughout the whole process of my complete AC installation. The entire process was easy with Bold City … More
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Response from the owner 2 months ago
Thank you so much for your fantastic 5-star review, Kenneth & Monique! We're thrilled to hear that Jacob, Ben, and Josie provided you with professional and efficient service during your complete AC installation. At Bold City Heating & Air, … More
WILLIAM MOSIER
2 reviews · 4 photos
a month ago
Crew showed up on time got done earlier than expected. Everything was clean. They were quiet. I was able to work throughout the day while they were installing. Couldn’t have been more perfect. Happy with the service.
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Response from the owner a month ago
Thank you so much for your fantastic 5-star review, William! We're thrilled to hear that our team at Bold City Heating & Air made the installation process seamless and respectful of your work day. We appreciate your support and are glad you’re happy with our service! Let us know if you need anything else in the future!
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Jacksonville’s Best HVAC Company
At Bold City Heating & Air, we offer our customers exceptional service when it comes to HVAC in Jacksonville, FL.
From heating and cooling repairs to energy-efficient HVAC installations that save you money, we do it all. When we opened our family-owned business in 2016, we knew we wanted to be the best around and that’s a passion that still stands.
From the moment you call us to the moment we carry out our work, you can depend on us. We believe in clear upfront pricing, no hidden costs, and the highest level of workmanship. With our NATE-certified technicians and Energy Star systems we give you the perfect combination of choice, value, and customer care.
“Experience the Bold Difference” that is Bold City Heating & Air by calling us today!
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When it comes to heating and air services in Jacksonville, we offer all the services you need under one roof. But that’s not where our story ends.
From your HVAC system to your ducts and indoor air quality we offer a complete end-to-end solution. Our team is at the heart of everything we do. Our continuous program of education and training ensures our technicians are the best they can be. It also means our entire team stays up to date with the latest systems and technology. From our Energy Star systems to our whole-house approach, you can depend on every service and product we have to offer.
Our educated and experienced HVAC technicians specialize in a broad range of air conditioning, heating & indoor air quality solutions. We are dedicated to finding the right fit for your home or business. Our broad range of expertise ensures a solution to every challenge.
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When you need an HVAC contractor backed by generations of experience and who truly cares about your satisfaction, turn to Bold City Heating & Air. From air conditioning repairs to the installation of a new energy-efficient heating system, you can depend on our team. We’ll get to you as quickly as we can to solve any problem you might be experiencing.
If you need help with HVAC installation or replacement, we’ll recommend the perfect system and provide you with a competitive quote. We’ll help you to save money on your energy costs going forward and can even help with financing on approved credit.

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We’re proud to offer our high quality HVAC services to the residents of Jacksonville. Contact our team at Bold City Heating & Air today and experience our great service for yourself!

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Website history
Air conditioning
Air conditioning, often abbreviated as A/C (US) or air con (UK),[1] is the process of removing heat from an enclosed space to achieve a more comfortable interior temperature and in some cases also controlling the humidity of internal air. Air conditioning can be achieved using a mechanical 'air conditioner' or through other methods, including passive cooling and ventilative cooling.[2][3] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC).[4] Heat pumps are similar in many ways to air conditioners but use a reversing valve, allowing them to both heat and cool an enclosed space.[5]
Air conditioners, which typically use vapor-compression refrigeration, range in size from small units used in vehicles or single rooms to massive units that can cool large buildings.[6] Air source heat pumps, which can be used for heating as well as cooling, are becoming increasingly common in cooler climates.
Air conditioners can reduce mortality rates due to higher temperature.[7] According to the International Energy Agency (IEA) 1.6 billion air conditioning units were used globally in 2016.[8] The United Nations called for the technology to be made more sustainable to mitigate climate change and for the use of alternatives, like passive cooling, evaporative cooling, selective shading, windcatchers, and better thermal insulation.
History
[edit]Air conditioning dates back to prehistory.[9] Double-walled living quarters, with a gap between the two walls to encourage air flow, were found in the ancient city of Hamoukar, in modern Syria.[10] Ancient Egyptian buildings also used a wide variety of passive air-conditioning techniques.[11] These became widespread from the Iberian Peninsula through North Africa, the Middle East, and Northern India.[12]
Passive techniques remained widespread until the 20th century when they fell out of fashion and were replaced by powered air conditioning. Using information from engineering studies of traditional buildings, passive techniques are being revived and modified for 21st-century architectural designs.[13][12]

Air conditioners allow the building's indoor environment to remain relatively constant, largely independent of changes in external weather conditions and internal heat loads. They also enable deep plan buildings to be created and have allowed people to live comfortably in hotter parts of the world.[14]
Development
[edit]Preceding discoveries
[edit]In 1558, Giambattista della Porta described a method of chilling ice to temperatures far below its freezing point by mixing it with potassium nitrate (then called "nitre") in his popular science book Natural Magic.[15][16][17] In 1620, Cornelis Drebbel demonstrated "Turning Summer into Winter" for James I of England, chilling part of the Great Hall of Westminster Abbey with an apparatus of troughs and vats.[18] Drebbel's contemporary Francis Bacon, like della Porta a believer in science communication, may not have been present at the demonstration, but in a book published later the same year, he described it as "experiment of artificial freezing" and said that "Nitre (or rather its spirit) is very cold, and hence nitre or salt when added to snow or ice intensifies the cold of the latter, the nitre by adding to its cold, but the salt by supplying activity to the cold of the snow."[15]
In 1758, Benjamin Franklin and John Hadley, a chemistry professor at the University of Cambridge, conducted experiments applying the principle of evaporation as a means to cool an object rapidly. Franklin and Hadley confirmed that the evaporation of highly volatile liquids (such as alcohol and ether) could be used to drive down the temperature of an object past the freezing point of water. They experimented with the bulb of a mercury-in-glass thermometer as their object. They used a bellows to speed up the evaporation. They lowered the temperature of the thermometer bulb down to −14 °C (7 °F) while the ambient temperature was 18 °C (64 °F). Franklin noted that soon after they passed the freezing point of water 0 °C (32 °F), a thin film of ice formed on the surface of the thermometer's bulb and that the ice mass was about 6 mm (1⁄4 in) thick when they stopped the experiment upon reaching −14 °C (7 °F). Franklin concluded: "From this experiment, one may see the possibility of freezing a man to death on a warm summer's day."[19]
The 19th century included many developments in compression technology. In 1820, English scientist and inventor Michael Faraday discovered that compressing and liquefying ammonia could chill air when the liquefied ammonia was allowed to evaporate.[20] In 1842, Florida physician John Gorrie used compressor technology to create ice, which he used to cool air for his patients in his hospital in Apalachicola, Florida. He hoped to eventually use his ice-making machine to regulate the temperature of buildings.[20][21] He envisioned centralized air conditioning that could cool entire cities. Gorrie was granted a patent in 1851,[22] but following the death of his main backer, he was not able to realize his invention.[23] In 1851, James Harrison created the first mechanical ice-making machine in Geelong, Australia, and was granted a patent for an ether vapor-compression refrigeration system in 1855 that produced three tons of ice per day.[24] In 1860, Harrison established a second ice company. He later entered the debate over competing against the American advantage of ice-refrigerated beef sales to the United Kingdom.[24]
First devices
[edit]
Electricity made the development of effective units possible. In 1901, American inventor Willis H. Carrier built what is considered the first modern electrical air conditioning unit.[25][26][27][28] In 1902, he installed his first air-conditioning system, in the Sackett-Wilhelms Lithographing & Publishing Company in Brooklyn, New York.[29] His invention controlled both the temperature and humidity, which helped maintain consistent paper dimensions and ink alignment at the printing plant. Later, together with six other employees, Carrier formed The Carrier Air Conditioning Company of America, a business that in 2020 employed 53,000 people and was valued at $18.6 billion.[30][31]
In 1906, Stuart W. Cramer of Charlotte, North Carolina, was exploring ways to add moisture to the air in his textile mill. Cramer coined the term "air conditioning" in a patent claim which he filed that year, where he suggested that air conditioning was analogous to "water conditioning", then a well-known process for making textiles easier to process.[32] He combined moisture with ventilation to "condition" and change the air in the factories; thus, controlling the humidity that is necessary in textile plants. Willis Carrier adopted the term and incorporated it into the name of his company.[33]
Domestic air conditioning soon took off. In 1914, the first domestic air conditioning was installed in Minneapolis in the home of Charles Gilbert Gates. It is, however, possible that the considerable device (c. 2.1 m × 1.8 m × 6.1 m; 7 ft × 6 ft × 20 ft) was never used, as the house remained uninhabited[20] (Gates had already died in October 1913.)
In 1931, H.H. Schultz and J.Q. Sherman developed what would become the most common type of individual room air conditioner: one designed to sit on a window ledge. The units went on sale in 1932 at US$10,000 to $50,000 (the equivalent of $200,000 to $1,200,000 in 2024.)[20] A year later, the first air conditioning systems for cars were offered for sale.[34] Chrysler Motors introduced the first practical semi-portable air conditioning unit in 1935,[35] and Packard became the first automobile manufacturer to offer an air conditioning unit in its cars in 1939.[36]
Further development
[edit]Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air.[37] The first inverter air conditioners were released in 1980–1981.[38][39]
In 1954, Ned Cole, a 1939 architecture graduate from the University of Texas at Austin, developed the first experimental "suburb" with inbuilt air conditioning in each house. 22 homes were developed on a flat, treeless track in northwest Austin, Texas, and the community was christened the 'Austin Air-Conditioned Village.' The residents were subjected to a year-long study of the effects of air conditioning led by the nation’s premier air conditioning companies, builders, and social scientists. In addition, researchers from UT’s Health Service and Psychology Department studied the effects on the "artificially cooled humans." One of the more amusing discoveries was that each family reported being troubled with scorpions, the leading theory being that scorpions sought cool, shady places. Other reported changes in lifestyle were that mothers baked more, families ate heavier foods, and they were more apt to choose hot drinks.[40][41]
Air conditioner adoption tends to increase above around $10,000 annual household income in warmer areas.[42] Global GDP growth explains around 85% of increased air condition adoption by 2050, while the remaining 15% can be explained by climate change.[42]
As of 2016 an estimated 1.6 billion air conditioning units were used worldwide, with over half of them in China and USA, and a total cooling capacity of 11,675 gigawatts.[8][43] The International Energy Agency predicted in 2018 that the number of air conditioning units would grow to around 4 billion units by 2050 and that the total cooling capacity would grow to around 23,000 GW, with the biggest increases in India and China.[8] Between 1995 and 2004, the proportion of urban households in China with air conditioners increased from 8% to 70%.[44] As of 2015, nearly 100 million homes, or about 87% of US households, had air conditioning systems.[45] In 2019, it was estimated that 90% of new single-family homes constructed in the US included air conditioning (ranging from 99% in the South to 62% in the West).[46][47]
Operation
[edit]Operating principles
[edit]
Cooling in traditional air conditioner systems is accomplished using the vapor-compression cycle, which uses a refrigerant's forced circulation and phase change between gas and liquid to transfer heat.[48][49] The vapor-compression cycle can occur within a unitary, or packaged piece of equipment; or within a chiller that is connected to terminal cooling equipment (such as a fan coil unit in an air handler) on its evaporator side and heat rejection equipment such as a cooling tower on its condenser side. An air source heat pump shares many components with an air conditioning system, but includes a reversing valve, which allows the unit to be used to heat as well as cool a space.[50]
Air conditioning equipment will reduce the absolute humidity of the air processed by the system if the surface of the evaporator coil is significantly cooler than the dew point of the surrounding air. An air conditioner designed for an occupied space will typically achieve a 30% to 60% relative humidity in the occupied space.[51]
Most modern air-conditioning systems feature a dehumidification cycle during which the compressor runs. At the same time, the fan is slowed to reduce the evaporator temperature and condense more water. A dehumidifier uses the same refrigeration cycle but incorporates both the evaporator and the condenser into the same air path; the air first passes over the evaporator coil, where it is cooled[52] and dehumidified before passing over the condenser coil, where it is warmed again before it is released back into the room.[citation needed]
Free cooling can sometimes be selected when the external air is cooler than the internal air. Therefore, the compressor does not need to be used, resulting in high cooling efficiencies for these times. This may also be combined with seasonal thermal energy storage.[53]
Heating
[edit]Some air conditioning systems can reverse the refrigeration cycle and act as an air source heat pump, thus heating instead of cooling the indoor environment. They are also commonly referred to as "reverse cycle air conditioners". The heat pump is significantly more energy-efficient than electric resistance heating, because it moves energy from air or groundwater to the heated space and the heat from purchased electrical energy. When the heat pump is in heating mode, the indoor evaporator coil switches roles and becomes the condenser coil, producing heat. The outdoor condenser unit also switches roles to serve as the evaporator and discharges cold air (colder than the ambient outdoor air).
Most air source heat pumps become less efficient in outdoor temperatures lower than 4 °C or 40 °F.[54] This is partly because ice forms on the outdoor unit's heat exchanger coil, which blocks air flow over the coil. To compensate for this, the heat pump system must temporarily switch back into the regular air conditioning mode to switch the outdoor evaporator coil back to the condenser coil, to heat up and defrost. Therefore, some heat pump systems will have electric resistance heating in the indoor air path that is activated only in this mode to compensate for the temporary indoor air cooling, which would otherwise be uncomfortable in the winter.
Newer models have improved cold-weather performance, with efficient heating capacity down to −14 °F (−26 °C).[55][54][56] However, there is always a chance that the humidity that condenses on the heat exchanger of the outdoor unit could freeze, even in models that have improved cold-weather performance, requiring a defrosting cycle to be performed.
The icing problem becomes much more severe with lower outdoor temperatures, so heat pumps are sometimes installed in tandem with a more conventional form of heating, such as an electrical heater, a natural gas, heating oil, or wood-burning fireplace or central heating, which is used instead of or in addition to the heat pump during harsher winter temperatures. In this case, the heat pump is used efficiently during milder temperatures, and the system is switched to the conventional heat source when the outdoor temperature is lower.
Performance
[edit]The coefficient of performance (COP) of an air conditioning system is a ratio of useful heating or cooling provided to the work required.[57][58] Higher COPs equate to lower operating costs. The COP usually exceeds 1; however, the exact value is highly dependent on operating conditions, especially absolute temperature and relative temperature between sink and system, and is often graphed or averaged against expected conditions.[59] Air conditioner equipment power in the U.S. is often described in terms of "tons of refrigeration", with each approximately equal to the cooling power of one short ton (2,000 pounds (910 kg) of ice melting in a 24-hour period. The value is equal to 12,000 BTUIT per hour, or 3,517 watts.[60] Residential central air systems are usually from 1 to 5 tons (3.5 to 18 kW) in capacity.[citation needed]
The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.[61] A similar standard is the European seasonal energy efficiency ratio (ESEER).[citation needed]
Efficiency is strongly affected by the humidity of the air to be cooled. Dehumidifying the air before attempting to cool it can reduce subsequent cooling costs by as much as 90 percent. Thus, reducing dehumidifying costs can materially affect overall air conditioning costs.[62]
Control system
[edit]Wireless remote control
[edit]This type of controller uses an infrared LED to relay commands from a remote control to the air conditioner. The output of the infrared LED (like that of any infrared remote) is invisible to the human eye because its wavelength is beyond the range of visible light (940 nm). This system is commonly used on mini-split air conditioners because it is simple and portable. Some window and ducted central air conditioners uses it as well.
Wired controller
[edit]A wired controller, also called a "wired thermostat," is a device that controls an air conditioner by switching heating or cooling on or off. It uses different sensors to measure temperatures and actuate control operations. Mechanical thermostats commonly use bimetallic strips, converting a temperature change into mechanical displacement, to actuate control of the air conditioner. Electronic thermostats, instead, use a thermistor or other semiconductor sensor, processing temperature change as electronic signals to control the air conditioner.
These controllers are usually used in hotel rooms because they are permanently installed into a wall and hard-wired directly into the air conditioner unit, eliminating the need for batteries.
Types
[edit]Types | Typical Capacity* | Air supply | Mounting | Typical application |
---|---|---|---|---|
Mini-split | small – large | Direct | Wall | Residential |
Window | very small – small | Direct | Window | Residential |
Portable | very small – small | Direct / Ducted | Floor | Residential, remote areas |
Ducted (individual) | small – very large | Ducted | Ceiling | Residential, commercial |
Ducted (central) | medium – very large | Ducted | Ceiling | Residential, commercial |
Ceiling suspended | medium – large | Direct | Ceiling | Commercial |
Cassette | medium – large | Direct / Ducted | Ceiling | Commercial |
Floor standing | medium – large | Direct / Ducted | Floor | Commercial |
Packaged | very large | Direct / Ducted | Floor | Commercial |
Packaged RTU (Rooftop Unit) | very large | Ducted | Rooftop | Commercial |
* where the typical capacity is in kilowatt as follows:
- very small: <1.5 kW
- small: 1.5–3.5 kW
- medium: 4.2–7.1 kW
- large: 7.2–14 kW
- very large: >14 kW
Mini-split and multi-split systems
[edit]
Ductless systems (often mini-split, though there are now ducted mini-split) typically supply conditioned and heated air to a single or a few rooms of a building, without ducts and in a decentralized manner.[63] Multi-zone or multi-split systems are a common application of ductless systems and allow up to eight rooms (zones or locations) to be conditioned independently from each other, each with its indoor unit and simultaneously from a single outdoor unit.
The first mini-split system was sold in 1961 by Toshiba in Japan, and the first wall-mounted mini-split air conditioner was sold in 1968 in Japan by Mitsubishi Electric, where small home sizes motivated their development. The Mitsubishi model was the first air conditioner with a cross-flow fan.[64][65][66] In 1969, the first mini-split air conditioner was sold in the US.[67] Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which can be thought of as larger multi-split systems) were also invented by Daikin in 1982. Both were first sold in Japan.[68] Variable refrigerant flow systems when compared with central plant cooling from an air handler, eliminate the need for large cool air ducts, air handlers, and chillers; instead cool refrigerant is transported through much smaller pipes to the indoor units in the spaces to be conditioned, thus allowing for less space above dropped ceilings and a lower structural impact, while also allowing for more individual and independent temperature control of spaces. The outdoor and indoor units can be spread across the building.[69] Variable refrigerant flow indoor units can also be turned off individually in unused spaces.[citation needed] The lower start-up power of VRF's DC inverter compressors and their inherent DC power requirements also allow VRF solar-powered heat pumps to be run using DC-providing solar panels.
Ducted central systems
[edit]Split-system central air conditioners consist of two heat exchangers, an outside unit (the condenser) from which heat is rejected to the environment and an internal heat exchanger (the evaporator, or Fan Coil Unit, FCU) with the piped refrigerant being circulated between the two. The FCU is then connected to the spaces to be cooled by ventilation ducts.[70] Floor standing air conditioners are similar to this type of air conditioner but sit within spaces that need cooling.
Central plant cooling
[edit]Large central cooling plants may use intermediate coolant such as chilled water pumped into air handlers or fan coil units near or in the spaces to be cooled which then duct or deliver cold air into the spaces to be conditioned, rather than ducting cold air directly to these spaces from the plant, which is not done due to the low density and heat capacity of air, which would require impractically large ducts. The chilled water is cooled by chillers in the plant, which uses a refrigeration cycle to cool water, often transferring its heat to the atmosphere even in liquid-cooled chillers through the use of cooling towers. Chillers may be air- or liquid-cooled.[71][72]
Portable units
[edit]A portable system has an indoor unit on wheels connected to an outdoor unit via flexible pipes, similar to a permanently fixed installed unit (such as a ductless split air conditioner).
Hose systems, which can be monoblock or air-to-air, are vented to the outside via air ducts. The monoblock type collects the water in a bucket or tray and stops when full. The air-to-air type re-evaporates the water, discharges it through the ducted hose, and can run continuously. Many but not all portable units draw indoor air and expel it outdoors through a single duct, negatively impacting their overall cooling efficiency.
Many portable air conditioners come with heat as well as a dehumidification function.[73]
Window unit and packaged terminal
[edit]
The packaged terminal air conditioner (PTAC), through-the-wall, and window air conditioners are similar. These units are installed on a window frame or on a wall opening. The unit usually has an internal partition separating its indoor and outdoor sides, which contain the unit's condenser and evaporator, respectively. PTAC systems may be adapted to provide heating in cold weather, either directly by using an electric strip, gas, or other heaters, or by reversing the refrigerant flow to heat the interior and draw heat from the exterior air, converting the air conditioner into a heat pump. They may be installed in a wall opening with the help of a special sleeve on the wall and a custom grill that is flush with the wall and window air conditioners can also be installed in a window, but without a custom grill.[74]
Packaged air conditioner
[edit]Packaged air conditioners (also known as self-contained units)[75][76] are central systems that integrate into a single housing all the components of a split central system, and deliver air, possibly through ducts, to the spaces to be cooled. Depending on their construction they may be outdoors or indoors, on roofs (rooftop units),[77][78] draw the air to be conditioned from inside or outside a building and be water or air-cooled. Often, outdoor units are air-cooled while indoor units are liquid-cooled using a cooling tower.[70][79][80][81][82][83]
Types of compressors
[edit]Compressor types | Common applications | Typical capacity | Efficiency | Durability | Repairability |
---|---|---|---|---|---|
Reciprocating | Refrigerator, Walk-in freezer, portable air conditioners | small – large | very low (small capacity) medium (large capacity) | very low | medium |
Rotary vane | Residential mini splits | small | low | low | easy |
Scroll | Commercial and central systems, VRF | medium | medium | medium | easy |
Rotary screw | Commercial chiller | medium – large | medium | medium | hard |
Centrifugal | Commercial chiller | very large | medium | high | hard |
Maglev Centrifugal | Commercial chiller | very large | high | very high | very hard |
Reciprocating
[edit]- Main article: Reciprocating compressor
This compressor consists of a crankcase, crankshaft, piston rod, piston, piston ring, cylinder head and valves. [citation needed]
Scroll
[edit]- Main article: Scroll compressor
This compressor uses two interleaving scrolls to compress the refrigerant.[84] it consists of one fixed and one orbiting scrolls. This type of compressor is more efficient because it has 70 percent less moving parts than a reciprocating compressor. [citation needed]
Screw
[edit]This compressor use two very closely meshing spiral rotors to compress the gas. The gas enters at the suction side and moves through the threads as the screws rotate. The meshing rotors force the gas through the compressor, and the gas exits at the end of the screws. The working area is the inter-lobe volume between the male and female rotors. It is larger at the intake end, and decreases along the length of the rotors until the exhaust port. This change in volume is the compression. [citation needed]
Capacity modulation technologies
[edit]There are several ways to modulate the cooling capacity in refrigeration or air conditioning and heating systems. The most common in air conditioning are: on-off cycling, hot gas bypass, use or not of liquid injection, manifold configurations of multiple compressors, mechanical modulation (also called digital), and inverter technology. [citation needed]
Hot gas bypass
[edit]Hot gas bypass involves injecting a quantity of gas from discharge to the suction side. The compressor will keep operating at the same speed, but due to the bypass, the refrigerant mass flow circulating with the system is reduced, and thus the cooling capacity. This naturally causes the compressor to run uselessly during the periods when the bypass is operating. The turn down capacity varies between 0 and 100%.[85]
Manifold configurations
[edit]Several compressors can be installed in the system to provide the peak cooling capacity. Each compressor can run or not in order to stage the cooling capacity of the unit. The turn down capacity is either 0/33/66 or 100% for a trio configuration and either 0/50 or 100% for a tandem.[citation needed]
Mechanically modulated compressor
[edit]This internal mechanical capacity modulation is based on periodic compression process with a control valve, the two scroll set move apart stopping the compression for a given time period. This method varies refrigerant flow by changing the average time of compression, but not the actual speed of the motor. Despite an excellent turndown ratio – from 10 to 100% of the cooling capacity, mechanically modulated scrolls have high energy consumption as the motor continuously runs.[citation needed]
Variable-speed compressor
[edit]- Main article: Inverter compressor
This system uses a variable-frequency drive (also called an Inverter) to control the speed of the compressor. The refrigerant flow rate is changed by the change in the speed of the compressor. The turn down ratio depends on the system configuration and manufacturer. It modulates from 15 or 25% up to 100% at full capacity with a single inverter from 12 to 100% with a hybrid tandem. This method is the most efficient way to modulate an air conditioner's capacity. It is up to 58% more efficient than a fixed speed system.[citation needed]
Impact
[edit]Health effects
[edit]In hot weather, air conditioning can prevent heat stroke, dehydration due to excessive sweating, electrolyte imbalance, kidney failure, and other issues due to hyperthermia.[8][86] Heat waves are the most lethal type of weather phenomenon in the United States.[87][88] A 2020 study found that areas with lower use of air conditioning correlated with higher rates of heat-related mortality and hospitalizations.[89] The August 2003 France heatwave resulted in approximately 15,000 deaths, where 80% of the victims were over 75 years old. In response, the French government required all retirement homes to have at least one air-conditioned room at 25 °C (77 °F) per floor during heatwaves.[8]
Air conditioning (including filtration, humidification, cooling and disinfection) can be used to provide a clean, safe, hypoallergenic atmosphere in hospital operating rooms and other environments where proper atmosphere is critical to patient safety and well-being. It is sometimes recommended for home use by people with allergies, especially mold.[90][91] However, poorly maintained water cooling towers can promote the growth and spread of microorganisms such as Legionella pneumophila, the infectious agent responsible for Legionnaires' disease. As long as the cooling tower is kept clean (usually by means of a chlorine treatment), these health hazards can be avoided or reduced. The state of New York has codified requirements for registration, maintenance, and testing of cooling towers to protect against Legionella.[92]
Economic effects
[edit]First designed to benefit targeted industries such as the press as well as large factories, the invention quickly spread to public agencies and administrations with studies with claims of increased productivity close to 24% in places equipped with air conditioning.[93]
Air conditioning caused various shifts in demography, notably that of the United States starting from the 1970s. In the US, the birth rate was lower in the spring than during other seasons until the 1970s but this difference then declined since then.[94] As of 2007, the Sun Belt contained 30% of the total US population while it was inhabited by 24% of Americans at the beginning of the 20th century.[95] Moreover, the summer mortality rate in the US, which had been higher in regions subject to a heat wave during the summer, also evened out.[7]
The spread of the use of air conditioning acts as a main driver for the growth of global demand of electricity.[96] According to a 2018 report from the International Energy Agency (IEA), it was revealed that the energy consumption for cooling in the United States, involving 328 million Americans, surpasses the combined energy consumption of 4.4 billion people in Africa, Latin America, the Middle East, and Asia (excluding China).[8] A 2020 survey found that an estimated 88% of all US households use AC, increasing to 93% when solely looking at homes built between 2010 and 2020.[97]
Environmental effects
[edit]
Space cooling including air conditioning accounted globally for 2021 terawatt-hours of energy usage in 2016 with around 99% in the form of electricity, according to a 2018 report on air-conditioning efficiency by the International Energy Agency.[8] The report predicts an increase of electricity usage due to space cooling to around 6200 TWh by 2050,[8][98] and that with the progress currently seen, greenhouse gas emissions attributable to space cooling will double: 1,135 million tons (2016) to 2,070 million tons.[8] There is some push to increase the energy efficiency of air conditioners. United Nations Environment Programme (UNEP) and the IEA found that if air conditioners could be twice as effective as now, 460 billion tons of GHG could be cut over 40 years.[99] The UNEP and IEA also recommended legislation to decrease the use of hydrofluorocarbons, better building insulation, and more sustainable temperature-controlled food supply chains going forward.[99]
Refrigerants have also caused and continue to cause serious environmental issues, including ozone depletion and climate change, as several countries have not yet ratified the Kigali Amendment to reduce the consumption and production of hydrofluorocarbons.[100] CFCs and HCFCs refrigerants such as R-12 and R-22, respectively, used within air conditioners have caused damage to the ozone layer,[101] and hydrofluorocarbon refrigerants such as R-410A and R-404A, which were designed to replace CFCs and HCFCs, are instead exacerbating climate change.[102] Both issues happen due to the venting of refrigerant to the atmosphere, such as during repairs. HFO refrigerants, used in some if not most new equipment, solve both issues with an ozone damage potential (ODP) of zero and a much lower global warming potential (GWP) in the single or double digits vs. the three or four digits of hydrofluorocarbons.[103]
Hydrofluorocarbons would have raised global temperatures by around 0.3–0.5 °C (0.5–0.9 °F) by 2100 without the Kigali Amendment. With the Kigali Amendment, the increase of global temperatures by 2100 due to hydrofluorocarbons is predicted to be around 0.06 °C (0.1 °F).[104]
Alternatives to continual air conditioning include passive cooling, passive solar cooling, natural ventilation, operating shades to reduce solar gain, using trees, architectural shades, windows (and using window coatings) to reduce solar gain.[citation needed]
Social effects
[edit]Socioeconomic groups with a household income below around $10,000 tend to have a low air conditioning adoption,[42] which worsens heat-related mortality.[7] The lack of cooling can be hazardous, as areas with lower use of air conditioning correlate with higher rates of heat-related mortality and hospitalizations.[89] Premature mortality in NYC is projected to grow between 47% and 95% in 30 years, with lower-income and vulnerable populations most at risk.[89] Studies on the correlation between heat-related mortality and hospitalizations and living in low socioeconomic locations can be traced in Phoenix, Arizona,[105] Hong Kong,[106] China,[106] Japan,[107] and Italy.[108][109] Additionally, costs concerning health care can act as another barrier, as the lack of private health insurance during a 2009 heat wave in Australia, was associated with heat-related hospitalization.[109]
Disparities in socioeconomic status and access to air conditioning are connected by some to institutionalized racism, which leads to the association of specific marginalized communities with lower economic status, poorer health, residing in hotter neighborhoods, engaging in physically demanding labor, and experiencing limited access to cooling technologies such as air conditioning.[109] A study overlooking Chicago, Illinois, Detroit, and Michigan found that black households were half as likely to have central air conditioning units when compared to their white counterparts.[110] Especially in cities, Redlining creates heat islands, increasing temperatures in certain parts of the city.[109] This is due to materials heat-absorbing building materials and pavements and lack of vegetation and shade coverage.[111] There have been initiatives that provide cooling solutions to low-income communities, such as public cooling spaces.[8][111]
Other techniques
[edit]Buildings designed with passive air conditioning are generally less expensive to construct and maintain than buildings with conventional HVAC systems with lower energy demands.[112] While tens of air changes per hour, and cooling of tens of degrees, can be achieved with passive methods, site-specific microclimate must be taken into account, complicating building design.[12]
Many techniques can be used to increase comfort and reduce the temperature in buildings. These include evaporative cooling, selective shading, wind, thermal convection, and heat storage.[113]
Passive ventilation
[edit]


Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces.
There are two types of natural ventilation occurring in buildings: wind driven ventilation and buoyancy-driven ventilation. Wind driven ventilation arises from the different pressures created by wind around a building or structure, and openings being formed on the perimeter which then permit flow through the building. Buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior.[114]
Since the internal heat gains which create temperature differences between the interior and exterior are created by natural processes, including the heat from people, and wind effects are variable, naturally ventilated buildings are sometimes called "breathing buildings".Passive cooling
[edit]
Passive cooling is a building design approach that focuses on heat gain control and heat dissipation in a building in order to improve the indoor thermal comfort with low or no energy consumption.[115][116] This approach works either by preventing heat from entering the interior (heat gain prevention) or by removing heat from the building (natural cooling).[117]
Natural cooling utilizes on-site energy, available from the natural environment, combined with the architectural design of building components (e.g. building envelope), rather than mechanical systems to dissipate heat.[118] Therefore, natural cooling depends not only on the architectural design of the building but on how the site's natural resources are used as heat sinks (i.e. everything that absorbs or dissipates heat). Examples of on-site heat sinks are the upper atmosphere (night sky), the outdoor air (wind), and the earth/soil.
Passive cooling is an important tool for design of buildings for climate change adaptation – reducing dependency on energy-intensive air conditioning in warming environments.[119][120]
Daytime radiative cooling
[edit]
Passive daytime radiative cooling (PDRC) surfaces reflect incoming solar radiation and heat back into outer space through the infrared window for cooling during the daytime. Daytime radiative cooling became possible with the ability to suppress solar heating using photonic structures, which emerged through a study by Raman et al. (2014).[122] PDRCs can come in a variety of forms, including paint coatings and films, that are designed to be high in solar reflectance and thermal emittance.[121][123]
PDRC applications on building roofs and envelopes have demonstrated significant decreases in energy consumption and costs.[123] In suburban single-family residential areas, PDRC application on roofs can potentially lower energy costs by 26% to 46%.[124] PDRCs are predicted to show a market size of ~$27 billion for indoor space cooling by 2025 and have undergone a surge in research and development since the 2010s.[125][126]
Fans
[edit]Hand fans have existed since prehistory. Large human-powered fans built into buildings include the punkah.
The 2nd-century Chinese inventor Ding Huan of the Han dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered by prisoners.[127]: 99, 151, 233 In 747, Emperor Xuanzong (r. 712–762) of the Tang dynasty (618–907) had the Cool Hall (Liang Dian 涼殿) built in the imperial palace, which the Tang Yulin describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song dynasty (960–1279), written sources mentioned the air conditioning rotary fan as even more widely used.[127]: 134, 151
Thermal buffering
[edit]In areas that are cold at night or in winter, heat storage is used. Heat may be stored in earth or masonry; air is drawn past the masonry to heat or cool it.[13]
In areas that are below freezing at night in winter, snow and ice can be collected and stored in ice houses for later use in cooling.[13] This technique is over 3,700 years old in the Middle East.[128] Harvesting outdoor ice during winter and transporting and storing for use in summer was practiced by wealthy Europeans in the early 1600s,[15] and became popular in Europe and the Americas towards the end of the 1600s.[129] This practice was replaced by mechanical compression-cycle icemakers.
Evaporative cooling
[edit]In dry, hot climates, the evaporative cooling effect may be used by placing water at the air intake, such that the draft draws air over water and then into the house. For this reason, it is sometimes said that the fountain, in the architecture of hot, arid climates, is like the fireplace in the architecture of cold climates.[11] Evaporative cooling also makes the air more humid, which can be beneficial in a dry desert climate.[130]
Evaporative coolers tend to feel as if they are not working during times of high humidity, when there is not much dry air with which the coolers can work to make the air as cool as possible for dwelling occupants. Unlike other types of air conditioners, evaporative coolers rely on the outside air to be channeled through cooler pads that cool the air before it reaches the inside of a house through its air duct system; this cooled outside air must be allowed to push the warmer air within the house out through an exhaust opening such as an open door or window.[131]
See also
[edit]- Air filter
- Air purifier
- Cleanroom
- Crankcase heater
- Energy recovery ventilation
- Indoor air quality
- Particulates
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