AC Service: Specialist Air Conditioning Service Guarantees Your Home Remains Cool And Comfy Throughout Hot Days
Types of Air Conditioning Repair Work Provider
Ever had your air conditioner sputter to a halt simply as the summer season sun peaks? It's a frustrating circumstance-- one that makes you understand how many parts should operate in harmony for cool air to flow. From frozen coils to refrigerant leakages, the difficulties vary, but the services do not need to be a mystery.
Common AC Repair Categories
- Refrigerant Recharge and Leak Repair: Without the right quantity of refrigerant, your system struggles to cool your space. Identifying leaks is crucial to bring back efficiency.
- Compressor and Fan Motor Repairs: These parts are the heart and lungs of your air conditioner. When they stop working, airflow and cooling capability plummet.
- Thermostat Calibration and Replacement: Sometimes the offender is your thermostat sending combined signals-- adjusting or switching it out brings convenience back on track.
- Electrical Element Repair Work: Faulty circuitry or capacitors disrupt performance, often triggering unexpected shutdowns or erratic habits.
- Drain Line Cleansing and Repair: Obstructed condensate lines can trigger water damage and system shutdowns if overlooked.
How Bold City Heating and Air Deals With These Difficulties
Picture walking into your home after a blistering day, greeted by a sanctuary of cool air. Bold City Heating and Air changes that dream into truth by mastering every element of air conditioner repair. They do not simply patch leaks or swap parts-- they detect the source with surgical accuracy.
Frozen coils? They thaw the issue and prevent future freeze-ups. Electrical glitches? They trace every wire to ensure stability and security. Thermostat problems? They fine-tune settings for ideal climate control. No problem is too tangled, no malfunction too unknown.
What sets Bold City apart is their dedication to thoroughness. Each repair unfolds like a thoroughly choreographed dance, guaranteeing your system runs smoothly, effectively, and silently. It's not almost fixing what's broken; it has to do with restoring assurance and cool comfort, all while extending the life of your unit.
Unraveling the Mysteries of Air Conditioning Malfunctions
Imagine stepping into your home after a scorching day, just to be welcomed by a wave of warm, stagnant air. That sinking sensation? It normally means your a/c system is struggling. Amongst the myriad of missteps, refrigerant leakages typically play the bad guy. Not only do they sap the cooling power, but they quietly erode efficiency, leaving your energy costs to balloon. Have you ever wondered why your air conditioner cycles on and off so regularly? This phenomenon, called brief biking, could be the system's desperate cry for aid due to dirty filters or faulty thermostat calibration.
Expert Insights: Translating the Indications
Bold City Heating and Air recognizes how irritating it can be when your system declines to blow cold air or, worse, floods your home with unforeseen wetness. Their service technicians approach each concern with an investigator's accuracy. For instance, clogged condensate drains pipes frequently masquerade as minor annoyances however can result in water damage if overlooked.
Idea Only Pros Share
- Frequently inspect and clean your evaporator coil; dust buildup can decrease cooling effectiveness by as much as 30%.
- Ensure your thermostat is placed far from direct sunshine or heat-emitting home appliances to prevent incorrect readings.
- Listen for uncommon noises like rattling or hissing-- these often precede compressor or refrigerant problems.
- Check for ice development on coils; it indicates airflow restriction and needs instant attention.
Common Issues and Their Remedies
Issue | Possible Cause | Quick Repair |
---|---|---|
Warm Air Blowing | Refrigerant leakage or filthy filter | Seal leakages and change filters |
Short Biking | Thermostat or electrical concerns | Recalibrate thermostat and examine electrical wiring |
Water Leak | Obstructed condensate drain | Clear the drain pipeline |
Uncommon Noises | Loose parts or compressor issues | Tighten parts or service compressor |
Necessary Instruments for Detecting A/c Problems
Ever attempted fixing an air conditioning unit with just a screwdriver and a prayer? The truth is far more technical. The heart of reliable a/c repair depend on the precision of the tools wielded. A manifold gauge set, for circumstances, isn't simply a fancy gadget; it's the mechanic's stethoscope, revealing the concealed pressures within the system's veins. Without it, guessing the refrigerant levels resembles reading tea leaves.
Bold City Heating and Air grasps how vital these subtle readings are. They approach each system with a toolkit that's not simply detailed but diligently calibrated, making sure every twist, turn, and valve change hits the mark. Their understanding of the subtleties in pressure fluctuations and temperature gradients changes a job from uncertainty to science.
Tools That Transform Repair into Art
- Digital Multimeter: Measures voltage, existing, and resistance. Identifies electrical faults that can quietly undermine your AC unit.
- Thermometer: Necessary for determining temperature level differentials throughout coils, indicating airflow or refrigerant concerns.
- Drip Detectors: Using UV color or electronic sensors, these unveil the unnoticeable leakages that drain pipes effectiveness.
- Vacuum Pumps: Leave moisture and air, vital in preparing the system for a flawless recharge.
In my experience, even the smallest neglected information-- like a somewhat broken gasket-- can cascade into a system-wide inadequacy - Bold City Heating and Air. Strong City's specialists don't simply repair; they prepare for the subtle whispers of wear and tear before they scream out as breakdowns
Insider Tips from the Field
- Constantly double-check manifold gauge readings at different times of the day; ambient temperature level shifts can impact precision.
- Utilize a microamp clamp meter to spot faint electrical draws that suggest stopping working capacitors or motors.
- When leaving a system, expect the "searching" impact in the vacuum gauge, an expert idea indicating caught wetness.
Tools are only as great as the hands that wield them. Bold City Heating and Air's proficiency of their instruments raises cooling repair work from a simple service to a finely tuned craft.
Vital Safety Steps for Air Conditioning Repair Work
Electrical dangers hide in every corner of air conditioning system repair, particularly when dealing with capacitors holding recurring charge. Have you ever wondered why an abrupt jolt can shock even skilled service technicians? It's since a charged capacitor can save dangerous energy long after the system is powered down. That's why Bold City Heating and Air demands strenuous discharge protocols before touching any elements.
Working around refrigerants demands not just accuracy however also caution. Leaks can silently poison the air or cause frostbite on contact. When tackling these undetectable dangers, protective equipment isn't optional-- it's a lifeline. They understand that fumbling without proper gloves and goggles is similar to dancing with threat.
For those venturing into DIY repairs, heed these expert tips:
- Always cut power at the breaker panel before opening the system.
- Utilize a multimeter to verify absolutely no voltage before proceeding.
- Use insulated gloves and eye security to defend against electric shock and refrigerant exposure.
- Handle refrigerant lines with care-- avoid leaks or sharp bends that can result in leaks.
- Keep a fire extinguisher rated for electrical fires close by.
Picture the horror of an abrupt stimulate in a dirty, enclosed area-- fires spark in the blink of an eye. Bold City Heating and Air's service technicians use precise cleansing routines to remove dust build-up that might otherwise fuel unintentional combustion.
Security List Before Beginning Repair Work
Security Step | Why It Matters |
---|---|
Power Seclusion | Avoids unintentional electrocution and devices damage |
Capacitor Discharge | Eliminates kept electrical energy that can trigger shocks |
Protective Gear Use | Shields skin and eyes from refrigerants and particles |
Leak Detection | Guarantees air quality and prevents refrigerant loss |
Work Area Ventilation | Decreases inhalation risks and dissipates combustible gases |
In the realm of AC repair work, hurrying through safety checks resembles skipping steps on a high wire-- one bad move can cascade into calamity. Bold City Heating and Air's dedication to these preventative measures changes a risky venture into a managed, predictable operation. They remain vigilant, understanding that true proficiency in air conditioning repair work is as much about securing lives as it is about bring back comfort.
Cooling Solutions in Jacksonville, FL
Jacksonville, FL is a vibrant city known for its comprehensive park system, stunning beaches, and thriving arts scene. As the biggest city by location in the continental United States, it uses homeowners and visitors plenty of outdoor activities, including boating along the St - Bold City Heating and Air. Johns River and checking out the Jacksonville Zoo and Gardens. The city's warm environment makes efficient cooling important for convenience and health throughout the year
For those in requirement of air conditioning services, Bold City Heating and Air provides professional assistance and complimentary assessments to help ensure your home or service stays cool and comfortable. Reach out to them for dependable suggestions and services on a/c repair customized to your needs.
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- Timuquana: Timuquana is a housing neighborhood located in Jacksonville FL, known for its tranquil streets and community parks. It offers a combination of detached houses and easy access to local amenities and schools.
- San Jose Forest: San Jose Forest is a residential neighborhood located in Jacksonville, Florida, known for its verdant greenery and kid-friendly atmosphere. The area features a mix of private residences and local parks, offering a quiet suburban environment.
- E-Town: E-Town is a vibrant neighborhood located in Jacksonville, Florida, known for its multicultural community and historical significance. It features a blend of residential areas, local businesses, and cultural landmarks that enhance its unique character.
- Cummer Museum of Art and Gardens: The Cummer Museum of Art and Gardens displays a wide collection of art encompassing various times and cultures. Guests can also discover lovely formal gardens that look out over the St. Johns River in Jacksonville FL.
- Jacksonville Zoo and Gardens: Jacksonville Zoo and Gardens presents a diverse range of creatures and flora from across the globe. It offers captivating exhibits, instructive activities, and conservation initiatives for guests of all years. Jacksonville FL
- Museum of Science and History: This Museum of Science & History in Jacksonville FL presents interactive exhibits and a planetarium suitable for all ages. Guests can explore science, history, and culture through engaging displays and educational programs.
- Kingsley Plantation: Kingsley Plantation is a historic site that offers a glimpse into Florida's plantation history, encompassing the lives of enslaved people and the planter family. Visitors can tour the grounds, including the slave quarters, plantation house, and barn. Jacksonville FL
- Fort Caroline National Memorial: Fort Caroline National Memorial celebrates the 16th-century French endeavor to found a colony in Florida. It offers displays and trails exploring the history and natural environment of the area in Jacksonville FL.
- Timucuan Ecological and Historic Preserve: Timucuan Ecological and Historic Preserve safeguards one of the remaining unspoiled 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 huge, famous water fountain in Jacksonville FL. It showcases striking water features and lights, making it a well-liked site and meeting spot.
- Riverside Arts Market: Riverside Arts Market in Jacksonville FL, is a lively weekly arts and crafts market beneath the Fuller Warren Bridge. It features local artisans, live music, food sellers, and a beautiful scene of the St. Johns River.
- San Marco Square: San Marco Square is a lovely retail and dining area with a European-inspired ambiance. It is renowned for its exclusive shops, restaurants, and the iconic fountain featuring lions. Jacksonville FL
- St Johns Town Center: St. Johns Town Center is an upscale open-air retail center in Jacksonville FL, offering a mix of luxury retailers, popular brands, and restaurants. It is a leading spot for purchasing, dining, and entertainment in Northeast FL.
- Avondale Historic District: Avondale Historic District presents charming early 20th-century architecture and boutique shops. It's a vibrant neighborhood recognized for its local restaurants and historic character. Jacksonville FL
- Treaty Oak Park: Treaty Oak Park is a gorgeous area in Jacksonville FL, home to a giant, ancient oak tree. The park offers a tranquil escape with walking paths and scenic views of the St. Johns River.
- Little Talbot Island State Park: Little Talbot Island State Park in Jacksonville FL provides immaculate beaches and diverse ecosystems. Guests can enjoy recreation such as hiking, camping, and wildlife viewing in this natural shoreline setting.
- Big Talbot Island State Park: Big Talbot Island State Park in Jacksonville FL, provides stunning coastal scenery and diverse habitats for nature enthusiasts. Explore the one-of-a-kind boneyard beach, hike scenic trails, and observe abundant wildlife in this lovely wildlife sanctuary.
- Kathryn Abbey Hanna Park: Kathryn Abbey Hanna Park in Jacksonville FL, offers a stunning beach, wooded trails, and a 60-acre freshwater lake for recreation. It is a well-known place for camping, surfing, kayaking, and biking.
- Jacksonville Arboretum and Gardens: Jacksonville Arboretum & Gardens provides a beautiful natural escape with diverse paths and themed gardens. Visitors can explore a range of plant life and relish tranquil outside recreation.
- Memorial Park: Memorial Park is a 5.25-acre park that serves as a tribute to the over 1,200 Floridians who gave their lives in World War I. The park features a statue, pool, and gardens, offering a place for remembrance and thought. Jacksonville FL
- Hemming Park: Hemming Park is Jacksonville FL's oldest park, a historical public square hosting events, bazaars, and social gatherings. It offers a lush space in the center of downtown with art installations and a lively ambiance.
- Metropolitan Park: Metropolitan Park in Jacksonville FL provides a lovely waterfront location for gatherings and leisure. With playgrounds, a music stage, and picturesque views, it's a popular destination for residents and visitors as well.
- Confederate Park: Confederate Park in Jacksonville FL, was initially designated to honor Confederate soldiers and sailors. It has since been renamed and repurposed as a space for community events and recreation.
- Beaches Museum and History Park: Beaches Museum and History Park safeguards and relays the unique history of Jacksonville's beaches. Explore exhibits on community life-saving, surfing, and initial beach communities.
- Atlantic Beach: Atlantic Beach features a delightful seaside area with gorgeous beaches and a relaxed atmosphere. Visitors can enjoy surfing, swimming, and investigating local shops and restaurants in Jacksonville FL.
- Neptune Beach: The city of Neptune Beach provides a traditional Florida beach town feeling with its grainy shores and relaxed atmosphere. People can partake in surfing, swimming, and discovering nearby shops and restaurants in Jacksonville FL.
- Jacksonville Beach: Jacksonville Beach is a lively coastal city known for its sandy beaches and surfing scene. It provides a mix of recreational activities, restaurants, and nightlife beside the Atlantic Ocean.
- Huguenot Memorial Park: This park offers a stunning beachfront location with options for camping, fishing, and birdwatching. Guests can appreciate the natural beauty of the region with its diverse wildlife and scenic coastal views in Jacksonville FL.
- Castaway Island Preserve: Castaway Island Preserve in Jacksonville FL, provides picturesque trails and boardwalks through diverse ecosystems. Guests can relish nature walks, bird watching, and exploring the beauty of the coastal area.
- Yellow Bluff Fort Historic State Park: Yellow Bluff Fort Historic State Park in Jacksonville FL protects the earthen remnants of a Civil War-era Southern fort. Guests can explore the historic location and discover about its significance through interpretive displays.
- Mandarin Museum & Historical Society: The Mandarin Museum & Historical Society protects the past of the Mandarin within Jacksonville FL. Guests are able to view exhibits and artifacts that highlight the location's distinctive history.
- Museum of Southern History: This Museum of Southern History displays artifacts and exhibits related to the history and culture of the Southern United States. Visitors can investigate a range 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, provides escorted walking tours to view saved big cats and other uncommon animals. It's a non-profit organization dedicated to providing a secure, caring, forever home for these animals.
- Air Conditioning Installation: Right placement of cooling systems ensures good and pleasant indoor climates. This crucial process ensures optimal performance and durability of climate control units.
- Air Conditioner: ACs chill inside spaces by extracting heat and humidity. Proper installation by qualified technicians ensures efficient operation and ideal climate control.
- Hvac: Hvac systems adjust heat and air's condition. They are essential for establishing environmental control answers in structures.
- Thermostat: A Thermostat is the primary component for adjusting temperature in HVAC systems. It signals the cooling unit to activate and deactivate, maintaining the preferred indoor environment.
- Refrigerant: Refrigerant is essential for temperature control systems, absorbing heat to produce cool air. Correct management of refrigerants is essential during HVAC setup for effective and safe operation.
- Compressor: The Compressor is the component of your cooling system, pressurizing refrigerant. The process is essential for effective temperature regulation in climate control systems.
- Evaporator Coil: The Evaporator Coil takes in heat from inside air, bringing it down. This part is essential for effective climate control system setup in buildings.
- Condenser Coil: The Condenser Coil serves as an important component in refrigeration systems, dissipating heat outside. It promotes the heat exchange needed for efficient indoor climate management.
- Ductwork: Ductwork is essential for distributing conditioned air throughout a building. Correct duct design and setup are vital for successful climate management system placement.
- Ventilation: Effective Ventilation is essential for proper air flow and indoor air standard. It has a key role in ensuring maximum operation and effectiveness of climate control equipment.
- Heat Pump: Heat Pumps move heat, providing both heating and cooling. They're key components in contemporary climate control system setups, offering energy-efficient temperature regulation.
- Split System: Split systems provide both cooling and heating through an indoor unit linked to an outdoor compressor. They offer a ductless answer for temperature control in certain rooms or areas.
- Central Air Conditioning: Central air conditioning systems chill whole homes from a sole, potent unit. Correct installation of these systems is essential for efficient and functional home chilling.
- Energy Efficiency Ratio: Energy Efficiency Ratio measures cooling effectiveness: a greater Energy Efficiency Ratio indicates better operation and lower energy consumption for climate control systems. Choosing a unit with a good Energy Efficiency Ratio can significantly lower long-term costs when setting up a new climate control system.
- Variable Speed Compressor: Variable Speed Compressor adjust refrigeration production to meet demand, improving efficiency and convenience in climate control systems. This precise modulation decreases energy loss and keeps uniform thermals in building environments.
- Compressor Maintenance: Compressor Maintenance ensures efficient operation and lifespan in refrigeration systems. Ignoring it can lead to expensive repairs or system breakdowns when establishing climate control.
- Air Filter: Air Filter trap dirt and particles, ensuring pure airflow within HVAC systems. This enhances system efficiency and indoor air quality during climate control setup.
- Installation Manual: An Installation Manual gives key guidance for correctly setting up a cooling system. It guarantees correct steps are used for optimal performance and safety during the unit's setup.
- Electrical Wiring: Electrical Wiring is essential for supplying power to and controlling the components of climate control systems. Suitable wiring ensures secure and effective operation of the cooling and heating units.
- Indoor Unit: The Indoor Unit circulates treated air inside a room. This is a key component for climate control systems, making sure of correct temp control in structures.
- Outdoor Unit: The Outdoor Unit contains the compressor and condenser, dissipating heat outside. It's crucial for a full climate control system setup, guaranteeing efficient cooling inside.
- Maintenance: Routine upkeep ensures efficient performance and lengthens the lifespan of climate control systems. Proper Maintenance averts failures and improves the performance of installed cooling systems.
- Energy Efficiency: Energy Efficiency is crucial for lowering energy consumption and expenses when installing new climate control systems. Prioritizing effective equipment and proper setup minimizes environmental effect and maximizes long-term savings.
- Thermodynamics: Thermodynamics explains how heat moves and converts energy, vital for cooling system system. Efficient climate control design relies on thermodynamic principles to optimize energy use during setup location.
- Building Codes: Construction regulations ensure proper and secure HVAC system arrangement in structures. They govern aspects such as energy performance and air flow for climate control systems.
- Load Calculation: Load Calculation figures out the heating and cooling demands of a area. This is essential for picking suitably sized HVAC units for optimal environmental control.
- Mini Split: Mini Splits provide a ductless approach to temperature management, providing focused heating and cooling. The ease of placement renders them suitable for spaces where adding ductwork for temperature control is impractical.
- Air Handler: The Air Handler moves conditioned air throughout a building. It is a crucial component for correct climate control system setup.
- Insulation: Insulation is vital for keeping efficient temperature control within a structure. It reduces heat transfer, lessening the burden on air conditioning and optimizing climate control setups.
- Drainage System: Drainage systems eliminate condensate generated by cooling equipment. Proper drainage stops water damage and guarantees optimal operation of climate control setups.
- Filter: Strainers are vital parts that eliminate contaminants from the air during the installation of climate control systems. This guarantees cleaner air circulation and safeguards the system's inner components.
- Heating Ventilation And Air Conditioning: Heating Ventilation And Air Conditioning systems control inside climate by regulating temperature, humidity, and air condition. Proper installation of these systems ensures efficient and productive cooling and environmental control within buildings.
- Split System Air Conditioner: Split system air conditioners offer effective cooling and heating by separating the compressor and condenser from the air handler. Their design simplifies the process of establishing climate control in homes and businesses.
- Hvac Technician: Hvac Technicians are trained professionals who focus in the setup of temperature regulation systems. They ensure appropriate functionality and effectiveness of these systems for maximum indoor comfort.
- Indoor Air Quality: Indoor Air Quality greatly impacts comfort and health, so HVAC system setup should prioritize filtration and ventilation. Correct system planning and setup is vital for optimizing air quality.
- Condensate Drain: This Condensate Drain eliminates water created throughout the cooling operation, preventing harm and keeping system effectiveness. Proper drain setup is crucial for successful climate control installation and extended performance.
- Variable Refrigerant Flow: Variable Refrigerant Flow (VRF) systems accurately regulate refrigerant volume to different zones, providing tailored cooling and heating. This technology is essential for establishing effective and adaptable climate control in building environments.
- Building Automation System: Building Automation System coordinate and optimize the operation of HVAC devices. This results in improved temperature regulation and energy efficiency in buildings.
- Air Conditioning: HVAC systems regulate indoor temperature and atmosphere. Proper installation of these systems is vital for efficient and effective Air Conditioning.
- Temperature Control: Accurate temperature regulation is crucial for effective climate control system setup. It ensures peak performance and comfort in new cooling systems.
- Thermistor: Temperature-sensitive resistors are thermistors used in climate control systems to measure accurately air temperature. This data assists to control system performance, guaranteeing optimal performance and energy efficiency in environmental control setups.
- Thermocouple: Temperature sensors are temperature sensors crucial for guaranteeing proper HVAC system installation. They precisely measure temperature, enabling precise modifications and optimal climate control performance.
- Digital Thermostat: Digital Thermostats precisely regulate temperature, improving HVAC system performance. They are essential for setting up home climate control systems, ensuring effective and pleasant environments.
- Programmable Thermostat: Programmable Thermostats improve climate control systems by enabling customized temperature schedules. This results in enhanced energy savings and comfort in home cooling setups.
- Smart Thermostat: Clever thermostat streamline home temperature management by understanding user preferences and changing temperatures on their own. They play a key role in today's HVAC system setups, improving energy savings and convenience.
- Bimetallic Strip: A Bimetallic Strip, composed of two metals that have different expansion rates, curves in response to temperature changes. This characteristic is utilized in HVAC systems to control thermostats and regulate heating or cooling operations.
- Capillary Tube Thermostat: A Capillary Tube Thermostat accurately regulates temperature in cooling systems via remote sensing. The component is vital for maintaining desired climate control within buildings.
- Thermostatic Expansion Valve: The Thermostatic Expansion Valve controls refrigerant flow into the evaporator, keeping optimal cooling. This part is crucial for efficient operation of refrigeration and air conditioning systems in buildings.
- Setpoint: Setpoint is the target temperature a climate management system strives to reach. It guides the system's performance during climate control configurations to maintain preferred comfort levels.
- Temperature Sensor: Temperature sensing devices are vital for adjusting warming, ventilation, and cooling systems by observing air temperature and guaranteeing effective climate control. Their data assists improve system performance during climate control installation and maintenance.
- Feedback Loop: A Feedback Loop assists in controlling temperature during climate control system setup by constantly monitoring and modifying settings. This ensures optimal performance and energy efficiency of installed residential cooling.
- Control System: Control Systems govern temperature, humidity, and airflow in environmental control setups. They ensure peak comfort and energy savings in climate-controlled environments.
- Thermal Equilibrium: Thermal Equilibrium is reached when parts attain the same temperature, essential for effective climate control system installation. Proper equilibrium guarantees peak performance and energy savings in set up cooling systems.
- Thermal Conductivity: Thermal Conductivity dictates how efficiently materials transfer heat, affecting the cooling system setup. Choosing materials with appropriate thermal properties assures best performance of installed climate control systems.
- Thermal Insulation: Thermal insulation minimizes heat flow, ensuring efficient cooling by lessening the workload on climate control systems. This improves energy efficiency and maintains consistent temperatures in buildings.
- On Off Control: On-Off Control keeps wanted temperatures by fully turning on or deactivating cooling systems. This easy method is important for regulating environment within buildings throughout environmental control system configuration .
- Pid Controller: PID controllers accurately regulate temps in HVAC units. This ensures effective climate control during facility temperature configuration and functioning.
- Evaporator: This Evaporator absorbs heat from within a space, chilling the air. This is a vital component in climate control systems created for home comfort.
- Condenser: This Condenser unit is a essential component in cooling equipment, rejecting heat extracted from the indoor space to the external environment. Its correct installation is important for efficient climate control system location and performance.
- Chlorofluorocarbon: CFCs have been once common refrigerants which helped with refrigeration in numerous building systems. Their part has diminished due to environmental concerns about ozone depletion.
- Hydrofluorocarbon: Hydrofluorocarbon are coolants typically used in refrigeration systems for structures and cars. Their proper management is crucial during the setup of environmental control systems to prevent environmental harm and guarantee effective operation.
- Hydrochlorofluorocarbon: Hydrochlorofluorocarbons were previously regularly used coolants in air conditioning systems for structures. Their phase-out has caused the use of more sustainable alternatives for new HVAC setups.
- Global Warming Potential: Global Warming Potential (GWP) shows how much a certain mass of greenhouse gas contributes to global warming over a specified period relative to carbon dioxide. Selecting refrigerants with less GWP is crucial 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 harm.
- Phase Change: Phase Change of refrigerants are crucial for effectively moving heat in climate control systems. Evaporation and condensation cycles allow cooling by absorbing heat indoors and releasing it outdoors.
- Heat Transfer: Heat Transfer principles are vital for successful climate control system setup. Grasping conduction, convection, and radiation ensures optimal system performance and energy savings during the course of installing home cooling.
- Refrigeration Cycle: The cooling process transfers heat, allowing cooling in climate-control systems. Proper setup and upkeep ensure efficient performance and long life of these cooling options.
- Environmental Protection Agency: EPA regulates refrigerants and sets standards for HVAC system maintenance to safeguard the ozone layer and lower greenhouse gas emissions. Technicians handling refrigeration equipment must be certified to ensure correct refrigerant management and stop environmental damage.
- Leak Detection: Leak Detection guarantees the integrity of refrigerant lines after climate control system placement. Spotting and addressing leaks is essential for optimal function and environmental safety of newly setup climate control systems.
- Pressure Gauge: Pressure gauges are vital tools for checking refrigerant levels during HVAC system setup. They ensure optimal performance and prevent damage by verifying pressures are within certain ranges for proper cooling operation.
- Expansion Valve: The Expansion Valve controls refrigerant stream in cooling systems, permitting efficient heat absorption. 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. Choosing the right level is important for peak performance in environmental control system placement.
- Refrigerant Recovery: Refrigerant Recovery is the method of removing and keeping refrigerants during HVAC system setups. Properly recovering refrigerants stops environmental damage and ensures effective new cooling equipment installations.
- Refrigerant Recycling: Refrigerant Recycling recovers and recycles refrigerants, reducing environmental effects. This procedure is essential when installing climate control systems, guaranteeing responsible handling and preventing ozone depletion.
- Safety Data Sheet: Safety Data Sheets (SDS) give critical information on the secure handling and potential hazards of chemicals utilized in cooling system installation. Technicians use SDS data to protect themselves and prevent accidents during HVAC equipment installation and connection.
- Synthetic Refrigerant: Synthetic Refrigerants are vital fluids used in cooling systems to transfer heat. Their correct handling is crucial for effective climate control installation and maintenance.
- Heat Exchange: Heat Exchange is essential for cooling buildings, allowing efficient temperature regulation. It's a key process in climate control system configuration, assisting the transfer of heat to provide comfortable indoor spaces.
- Cooling Cycle: Cooling Cycle is the key procedure of heat removal, using refrigerant to absorb and give off heat. This process is essential for effective climate control system installation in buildings.
- Scroll Compressor: Scroll compressors efficiently compress refrigerant to power cooling systems. They are a critical component for efficient temperature regulation in buildings.
- Reciprocating Compressor: Reciprocating Compressors are essential parts that squeeze refrigerant in refrigeration systems. They facilitate heat exchange, allowing effective climate regulation within structures.
- Centrifugal Compressor: Centrifugal Compressors are critical parts that boost refrigerant stress in large-scale climate control systems. They effectively move refrigerant, enabling effective cooling and heating throughout wide areas.
- Rotary Compressor: Rotary Compressor represent a vital component in cooling systems, using a rotating device to compress refrigerant. Their efficiency and small size render them perfect for climate control setups in various applications.
- Compressor Motor: This Compressor Motor serves as the driving force for the cooling process, moving refrigerant. It is vital for proper climate control system setup and function in buildings.
- Compressor Oil: Compressor lubricant oils and protects moving parts inside a systems' compressor, ensuring efficient refrigerant compression for proper climate regulation. It is crucial to select the correct type of oil during system setup to ensure longevity and optimal function of the cooling appliance.
- Pressure Switch: A Pressure Switch observes refrigerant amounts, guaranteeing the system operates securely. It prevents damage by shutting down the cooling device if pressure drops beyond the ok range.
- Compressor Relay: The Compressor Relay is an electrical device that controls the compressor motor in cooling setups. It ensures the compressor starts and stops correctly, enabling effective temperature control within climate control systems.
- Suction Line: A Suction Line, a critical part in cooling systems, carries refrigerant vapor from the evaporator back the compressor. Correct sizing and insulation of this line are vital for effective system performance during climate control installation.
- Discharge Line: The Discharge Line moves hot, high-pressure refrigerant gas from the compressor to the condenser. Proper sizing and setup of the Discharge Line are crucial for the best cooling system configuration.
- Compressor Capacity: Compressor Capacity dictates the cooling capability of a system for indoor temperature control. Selecting the right size ensures effective temperature regulation during climate control setup.
- Cooling Load: Cooling Load is the volume of heat that must to be removed from a space to keep a preferred temperature. Correct cooling load calculation is important for proper HVAC system installation and size.
- Air Conditioning Repair: Air Conditioning Repair ensures systems function perfectly after they are setup. It's crucial for keeping efficient climate control systems installed.
- Refrigerant Leak: Refrigerant Leakage reduce cooling effectiveness and can lead to equipment failure. Fixing these leaks is vital for appropriate climate control system installation, ensuring maximum operation and lifespan.
- Seer Rating: SEER score represents an HVAC system's cooling performance, impacting long-term energy expenses. Higher SEER numbers imply greater energy savings when establishing climate control.
- Hspf Rating: HSPF Rating shows the heating efficiency of heat pumps. Increased ratings indicate better energy effectiveness during climate control installation.
- Preventative Maintenance: Preventative servicing guarantees HVAC systems work effectively and reliably after installation. Regular servicing minimizes breakdowns and extends the lifespan of climate control systems.
- Airflow: Airflow ensures effective cooling and heating distribution throughout a building. Correct Airflow is crucial for prime performance and comfort in climate control systems.
- Electrical Components: Electrical Components are critical for energizing and controlling systems that regulate indoor temperature. They assure proper functioning, safety, and effectiveness in heating and cooling arrangements.
- Refrigerant Charging: Refrigerant Charging is the method of adding the right quantity of refrigerant to a cooling system. This assures best performance and efficiency when installing climate control units.
- System Diagnosis: System Diagnosis identifies potential issues prior to, during, and following HVAC system installation. It guarantees best performance and averts upcoming troubles in HVAC installations.
- Hvac System: HVAC systems control heat, humidity, and atmosphere quality in buildings. They are critical for establishing climate-control solutions in residential and business spaces.
- Ductless Air Conditioning: Ductless systems provide focused temperature control without large ductwork. They make easier temperature control installation in rooms that lack pre-existing duct systems.
- Window Air Conditioner: Window air conditioners are standalone units installed in panes to chill single spaces. They provide a direct method for specific climate control inside a building.
- Portable Air Conditioner: Portable Air Conditioner units offer a flexible cooling answer for spaces lacking central systems. They can also provide temporary climate control during HVAC system configurations.
- System Inspection: System check ensures suitable installation of cooling systems by confirming part integrity and compliance to installation standards. This process ensures 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 process is essential for proper installation of climate control systems.
- Refrigerant Recharge: Refrigerant Recharge is vital for restoring cooling ability in cooling systems. It guarantees maximum function and durability of recently installed temperature regulation devices.
- Capacitor: These devices provide the needed energy increase to start and operate motors inside of climate control systems. Their proper function ensures efficient and reliable operation of the cooling unit.
- Contactor: The Contactor is an electrical switch that controls power for the outdoor unit's components. It allows the cooling system to activate when necessary.
- Blower Motor: The Blower Motor circulates air through the ductwork, enabling efficient heating and cooling delivery within a building. It is a vital 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 address this issue to ensure efficient and reliable cooling operation.
- Troubleshooting: Troubleshooting identifies and resolves issues that arise during climate control system installation. Sound fixing guarantees best system performance and stops future issues during building cooling appliance installation.
- Refrigerant Reclaiming: Refrigerant Reclaiming retrieves and reprocesses spent refrigerants. This process is crucial for eco-friendly climate control system establishment.
- 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 change requires using alternative refrigerants in new environmental control setups.
- Greenhouse Gas: Greenhouse gases trap heat, affecting the power efficiency and environmental impact of climate control system setups. Choosing refrigerants with lower global warming potential is vital for sustainable climate control execution.
- Cfc: CFCs were formerly critical refrigerants in refrigeration systems for structures and vehicles. Their use has been discontinued due to their detrimental impact on the ozone layer.
- Hcfc: Hcfc were previously common refrigerants used in refrigeration systems for buildings and vehicles. They facilitated the process of setting up climate control systems, but are now being phased out due to their ozone-depleting properties.
- Hfc: HFCs are commonly used refrigerants in cooling systems for buildings. Their appropriate handling is essential during the installation of these systems to minimize environmental impact.
- Refrigerant Oil: Cooling lubricant lubricates the compressor in refrigeration units, ensuring smooth operation and longevity. It's crucial for the correct function of climate control setups.
- Phase-Out: Phase-out is related to the progressive elimination of certain refrigerants with high global warming potential. This impacts the selection and maintenance of climate control systems in buildings.
- Gwp: GWP indicates a refrigerant's ability to heat the planet if discharged. Lower GWP refrigerants are progressively preferred in eco-friendly HVAC system configurations.
- Odp: ODP refrigerants damage the ozone layer, impacting regulations for refrigeration system installation. Installers must utilize environmentally friendly alternatives during HVAC equipment installation.
- Ashrae: Ashrae establishes standards and recommendations for HVAC system configuration. The criteria assure effective and secure climate control system deployment in buildings.
- Hvac Systems: Hvac Systems provide temperature and air condition regulation for indoor environments. They are essential for setting up cooling systems in buildings.
- Refrigerant Leaks: Refrigerant Leaks lower cooling system efficiency and may damage the environment. Correct procedures during climate control unit installation are crucial to prevent these leaks and ensure peak performance.
- Hvac Repair Costs: Hvac Repair Costs can greatly affect choices about switching to a new temperature system. Unexpected repair bills may encourage homeowners to put money in a complete home comfort setup for long-term savings.
- Hvac Installation: Hvac Installation includes installing warming, ventilation, and air conditioning systems. This is critical for enabling effective climate control inside buildings.
- Hvac Maintenance: Hvac Maintenance guarantees effective performance and extends system life. Appropriate maintenance is essential for seamless climate control system installations.
- Hvac Troubleshooting: Hvac Troubleshooting identifies and fixes issues 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 separate areas for customized temperature control. This approach optimizes comfort and energy savings during HVAC setup.
- Compressor Types: Various Compressor Types are vital parts for efficient climate control systems. Their choice significantly impacts system efficiency and performance in environmental comfort applications.
- Compressor Efficiency: Compressor Efficiency is vital, dictating how efficiently the system cools a room for a given energy input. Improving this efficiency directly impacts cooling system setup costs and long-term operational expenses.
- Compressor Overheating: Overheating Compressor can severely damage the device's core, resulting in system failure. Proper setup guarantees sufficient air flow and refrigerant amounts, avoiding this problem in climate control system installations.
- Compressor Failure: Compressor malfunction halts the refrigeration process, needing expert attention during climate control system configurations. A defective compressor compromises the entire system's efficiency and longevity when integrating it into a building.
- Overload Protector: An protects the compressor motor from getting too hot during climate control system installation. It stops harm by automatically shutting off power when too much current or temperature is detected.
- Fan Motor: Fan motors move air across evaporator and condenser coils, a critical process for effective climate control system installation. They aid heat transfer, guaranteeing peak cooling and heating performance within the designated space.
- Refrigerant Lines: Refrigerant Lines are crucial components that join the inside and outside units, circulating refrigerant to help cooling. Their proper correct installation is vital for efficient and productive climate control system installation.
- Condensing Unit: A Condensing Unit is the outside part in a cooling system. The unit rejects heat from the refrigerant, enabling indoor temperature regulation.
- Heat Rejection: Heat Rejection is vital for cooling systems to efficiently remove unwanted heat from a cooled area. Appropriate Heat Rejection guarantees efficient performance and lifespan of climate control setups.
- System Efficiency: System Efficiency is vital for reducing energy use and operational expenses. Optimizing performance during climate control configuration ensures long-term economy and environmental benefits.
- Pressure Drop: Pressure decrease is the decrease in fluid pressure as it flows through a setup, impacting airflow in climate control setups. Properly managing pressure decrease is essential for peak performance and effectiveness in climate control systems.
- Subcooling: Subcooling ensures best system performance by chilling the refrigerant under its condensing temperature. This action avoids flash gas, boosting refrigeration capacity and efficiency throughout HVAC system setup.
- Superheat: Superheat ensures that just vapor refrigerant enters the compressor, which prevents damage. It's crucial to measure superheat during HVAC system setup to optimize cooling performance and efficiency.
- Refrigerant Charge: Refrigerant Charge is the amount of refrigerant in a system, essential for peak cooling operation. Proper charging assures effective heat transfer and avoids damage during climate control installation.
- Corrosion: Corrosion impairs metallic elements, potentially causing leaks and system malfunctions. Protecting against Corrosion is essential for maintaining the efficiency and longevity of climate control arrangements.
- Fins: Blades boost the area of coils, increasing heat transfer efficiency. This is vital for peak performance in climate control system setups.
- Copper Tubing: Copper Tubing is vital for refrigerant transfer in air conditioning systems due to its long-lasting nature and effective heat transfer. Its trustworthy connections ensure suitable system operation during establishment of thermostat units.
- Aluminum Tubing: Aluminum Tubing is vital for conveying refrigerant in climate control systems. Their lightweight and rustproof properties make it perfect for connecting internal and external units in HVAC installations.
- Repair Costs: Sudden maintenance can greatly 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
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+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 …
6 months ago
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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.
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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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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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