Hvac Repair: Discover Trustworthy Heating & Cooling System Repair Work Near To Your Location

Kinds Of A/c Repair Work Services You Can Count On

Ever questioned why your air conditioning unit all of a sudden stops blowing cold air on the most popular day of the year? Or why the heater seems to sputter more than warm your home when winter season bites? These are familiar headaches for anyone looking for Heating and cooling Repair Near Me. The obstacles don't stop there: weird noises, fluctuating temperatures, or ineffective air flow can turn convenience into mayhem.

Fortunately, Bold City Heating and Air takes on these problems head-on, using a spectrum of specialized repair services that transform pain into relaxing relief. Bold City Heating and Air. Here's a look at the core services they master:

1. A/c Repair Work: From refrigerant leakages to compressor failures, every element is inspected and fixed to bring back cool air circulation.
2. Heater Repair Work: Whether it's a malfunctioning thermostat or a broken furnace igniter, no cold night goes unaddressed.
3. Ductwork Repair work: Leaky ducts can squander energy and decrease indoor air quality. Fixing these concealed perpetrators is a video game changer.
4. Thermostat Calibration: Accuracy in temperature control guarantees your system runs effectively, conserving energy and money.
5. Emergency Situation Heating And Cooling Services: When your system fails all of a sudden, timely repairs minimize downtime and pain.

Picture walking into your home after a sweltering day, greeted by a fresh, perfectly conditioned breeze. Or huddling on a wintry night, confident your heating won't betray you. These aren't just fantasies-- Bold City Heating and Air makes them truth with every repair work.

Why choose less when the very best a/c repair work near me can handle everything from minor glitches to major breakdowns? Bold City Heating and Air doesn't simply repair systems-- they bring back comfort and convenience to your home.

Common Heating And Cooling Issues and Solutions

When your air conditioning system sputters and stalls on the hottest day, it feels like deep space is playing a vicious joke. One of the most frequent perpetrators? A clogged up air filter. Dust, family pet hair, and particles choke the airflow, forcing your system to work overtime and eventually falter. Ever question why your energy expenses suddenly spike? That's your a/c system gasping under pressure.

Bold City Heating and Air comprehends the subtle signs that typically go unnoticed till it's nearly far too late. A whisper of strange noises or a faint burning smell can indicate internal issues that, if resolved swiftly, prevent costly replacements.

Leading A/c Issues Translated

• Refrigerant leakages-- Undetectable yet impactful, these leaks undermine cooling performance and can harm the environment.
• Thermostat breakdowns-- Often the perpetrator isn't the system but the brain behind it, misreading temperature levels and sending mixed signals.
• Frozen coils-- Typically an outcome of poor air flow or low refrigerant, these icy culprits halt cooling entirely.

Specialist Tips to Keep Your System in Peak Forming

1. Change filters every 1-3 months; it's the most basic act with the most significant payoff.
2. Check condensate drains pipes for blockages to avoid water damage and mold buildup.
3. Seal duct leaks to improve efficiency-- in some cases a few inches of tape conserve you hundreds.

Have you ever saw your system biking on and off like a nervous heartbeat? That brief biking is a warning that Bold City Heating and Air instantly recognizes. Bold City Heating and Air. They dive deep, detecting with accuracy, ensuring your heating and cooling doesn't just limp along however grows. Their method transforms anxiety into relief, turning technical headaches into cool comfort

Selecting a Reliable A/c Repair Work Specialist

When your air conditioning system sputters out in the peak of summer season, or your heating system declines to warm a chilly night, you don't just want any professional-- you desire somebody who understands the heart beat of your home's a/c system. Not every specialist has the knack for identifying the tricky perpetrators behind ineffective cooling or heating. Imagine calling somebody who patches the issue briefly, only to have the system fail once again days later on. Frustrating, right?

Bold City Heating and Air understands that dependability isn't almost appearing; it has to do with revealing up ready. Their specialists show up geared up with diagnostic tools that dive deeper than surface area signs, recording the real essence of the malfunction. They do not simply replace parts; they unwind the story your system is telling. Have you ever wondered why your energy bills increase mysteriously? Often, it's a subtle refrigerant leakage or a stopped up filter that's simple to ignore however expensive if overlooked.

Specialist Tips for Finding a Proficient A/c Specialist

• Accreditation and Licensing: Validate qualifications-- qualified pros back their work with recognized qualifications.
• Transparent Estimates: Try to find clear descriptions, not vague quotes that evade the details.
• Diagnostic Approach: Specialists use systematic checks-- no uncertainty, just exact problem-solving.
• Communication Abilities: Can they explain repairs without lingo? That's an indication they respect your understanding.
• Parts Quality Awareness: They ought to focus on resilient components, not fast repairs that fade fast.

Bold City Heating and Air thrives on a philosophy that a/c repair is less about quick repairs and more about long-lived solutions crafted with care. They welcome the complexity of each system, turning what may look like a difficult repair work into a smooth, transparent procedure. Like a competent detective, they unwind the quirks of your unit, guaranteeing that your convenience isn't just restored, however optimized.

Decoding the Expenses Behind A/c Repair Work Services

Ever noticed how an easy a/c repair work can in some cases spiral into a wallet-busting ordeal? The reality lies in the maze of hidden factors that influence repair costs. From the level of the damage to the age of your system, these elements weave an intricate story.

Think of a cold evening where your a/c sputters and stops working. You require a/c repair near me, and suddenly, you're confronted with a quote that feels like a puzzling puzzle (Bold City Heating and Air). Exactly what drives these numbers?

Secret Components Influencing Repair Expenses

• Severity of the Problem: Minor glitches like thermostat malfunctions cost less compared to compressor or coil replacements.
• Devices Age: Older systems typically need more substantial repairs or part replacements, which treks the cost.
• Labor Intricacy: Difficult-to-access units require more time and knowledge, naturally increasing labor costs.
• Replacement Parts: Authentic parts versus generic ones, accessibility, and shipping can swing costs extensively.
• Emergency Service: Repair work done outside regular hours normally include premium costs.

Bold City Heating and Air knows these intricacies like the back of their hand. They've seen direct how a cracked blower wheel or a stopped up condensate drain can turn into a pricey experience if disregarded. Their professionals don't just repair-- they identify with precision, ensuring you spend for what's necessary, not a penny more.

Here's a professional suggestion: routine evaluation of your HVAC system's filters and condensate lines can avoid little problems from snowballing. Did you know a clogged filter can require your unit to work overtime, triggering wear that demands expensive repairs?

Does your heating and cooling repair quote feel like a shot in the dark? Bold City Heating and Air's transparency and proficiency light up the process, guiding you through what each expense indicates. After all, understanding these aspects can turn a stressful repair work into a workable financial investment in your house's comfort.

Trustworthy Air Conditioning Service in Jacksonville, FL

Jacksonville, FL is a dynamic city known for its substantial park system, stunning beaches, and dynamic riverfront. As the most populated city in Florida, it offers a varied economy with strong sectors in financing, logistics, and health care. The city's warm climate makes effective and reliable a/c systems essential for citizens and companies alike to stay comfortable year-round.

For those looking for expert suggestions and expert heating and cooling repair near me, Bold City Heating and Air can supply a free assessment to help deal with any cooling or heating issues efficiently. They are prepared to help with all your heating and cooling requires.

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1. Downtown Jacksonville: Downtown Jacksonville serves as the core commercial area of Jacksonville, Florida, known for its vibrant mix of historic architecture and modern skyscrapers. It features cultural sites, parks along the water, and a range of dining and entertainment options.
2. Southside: Southside is a vibrant district in Jacksonville, FL, known for its blend of residential communities, malls, and commercial centers. It offers a mix of city convenience and suburban comfort, making it a well-liked area for families and professionals.
3. Northside: Northside is a large district in Jacksonville, FL, known for its varied communities and factory areas. It features a blend of residential neighborhoods, parks, and commercial zones, aiding the city's growth and development.
4. Westside: Westside is a vibrant district in Jacksonville, FL, known for its varied community and deep cultural heritage. It features a mix of housing areas, local businesses, and parks, offering a special blend of city and suburban life.
5. Arlington: Arlington is a dynamic district in Jacksonville, FL, known for its combination of residential areas and commercial zones. It features green spaces, malls, and access to the St. Johns River, making it a popular area for households and nature lovers.
6. Mandarin: Mandarin remains a historic area in Jacksonville, Florida, known for its picturesque riverfront views and appealing small-town atmosphere. It features lush parks, local shops, and a rich cultural heritage dating back to the 19th century.
7. San Marco: San Marco is a lively neighborhood in Jacksonville, FL, known for its historic architecture and quaint town center. It offers a mix of boutique shops, restaurants, and cultural attractions, making it a well-liked destination for residents and visitors alike.
8. Riverside: Riverside is a vibrant area in Jacksonville, FL, known for its classic architecture and thriving arts scene. It offers a blend of one-of-a-kind shops, restaurants, and picturesque riverfront parks, making it a popular destination for residents and visitors alike.
9. Avondale: Avondale is a charming neighborhood in Jacksonville, FL, known for its classic architecture and bustling local shops. It offers a blend of residential areas, trendy restaurants, and cultural attractions along the St. Johns River.
10. Ortega: Ortega is a historic and scenic neighborhood in Jacksonville, FL, known for its beautiful waterfront homes and leafy streets. It offers a delightful blend of classic Southern architecture and modern amenities, making it a coveted residential area.
11. Murray Hill: Murray Hill is a lively historic neighborhood in Jacksonville, FL, known for its quaint bungalows and diverse local businesses. It offers a blend of housing comfort and a lively arts and dining scene, making it a popular destination for residents and visitors alike.
12. Springfield: Springfield is a heritage neighborhood in Jacksonville, FL, known for its appealing early 20th-century architecture and dynamic community. It features a combination of residential homes, local businesses, and cultural attractions, making it a popular area for both residents and visitors.
13. East Arlington: East Arlington is a dynamic neighborhood in Jacksonville, FL, known for its varied community and accessible access to retail and leisure spots. It features a blend of residential homes, green spaces, and shops, making it a desirable place to live.
14. Fort Caroline: Fort Caroline is a historic district in Jacksonville, FL, known for its extensive colonial history and closeness to the site of the 16th-century French fort. It includes a mix of residential areas, parks, and cultural landmarks that highlight its heritage.
15. Greater Arlington: Greater Arlington in Jacksonville, FL, is a lively district known for its neighborhoods, malls, and recreational areas. It offers a combination of suburban lifestyle with easy access to the Jacksonville downtown and coastal areas.
16. Intracoastal West: Intracoastal West is a lively neighborhood in Jacksonville, FL, known for its picturesque waterways and nearness to the Intracoastal Waterway. It offers a combination of homes and businesses, providing a unique blend of city convenience and natural charm.
17. Jacksonville Beaches: Jacksonville Beaches is a thriving coastal locale in Jacksonville, FL, known for its beautiful sandy shores and relaxed atmosphere. It offers a blend of residential neighborhoods, local businesses, and leisure activities along the Atlantic Ocean.
18. Neptune Beach: Neptune Beach is a charming beachside community located in Jacksonville, Florida, known for its gorgeous beaches and calm atmosphere. It offers a combination of housing areas, local shops, and dining options, making it a popular destination for both residents and visitors.
19. Atlantic Beach: Atlantic Beach is a seaside community located in Jacksonville, Florida, known for its beautiful beaches and calm atmosphere. It offers a mix of residential areas, local shops, and outdoor recreational activities along the Atlantic Ocean.
20. Jackson Beach: Jacksonville Beach is a dynamic seaside community in Jacksonville, FL, known for its stunning sandy shores and energetic boardwalk. It offers a variety of residential neighborhoods, local shops, restaurants, and recreational activities, making it a popular destination for both residents and visitors.
21. Baldwin: Baldwin is a quiet town located within Duval County, near Jacksonville FL, Florida, known for its historic charm and friendly community. It features a blend of neighborhoods, local businesses, and scenic parks, offering a quiet, suburban atmosphere.
22. Oceanway: Oceanway is a residential neighborhood in Jacksonville, Florida, known for its suburban atmosphere and family-friendly amenities. It features a variety of housing options, parks, and local businesses, making it a popular area for residents seeking a neighborly environment.
23. South Jacksonville: South Jacksonville is a dynamic district in Jacksonville, FL, known for its living communities and small businesses. It offers a combination of historic character and up-to-date facilities, making it a popular area for families and professionals.
24. Deerwood: Deerwood is a prominent neighborhood in Jacksonville, FL, known for its upscale residential communities and manicured green spaces. It offers a mix of luxury homes, golf courses, and close access to shopping and dining options.
25. Baymeadows: Baymeadows is a lively district in Jacksonville, FL, known for its combination of residential neighborhoods and commercial areas. It offers a variety of shopping, dining, and recreational options, making it a popular destination for locals and visitors alike.
26. Bartram Park: Bartram Park is a vibrant neighborhood in Jacksonville, FL, known for its contemporary residential communities and proximity to nature. It offers a mix of urban amenities and outdoor recreational activities, making it a popular choice for families and professionals.
27. Nocatee: Nocatee is a master-planned community located near Jacksonville, FL, known for its family-friendly atmosphere and comprehensive amenities. It features green spaces, trails, and recreational facilities, making it a popular choice for residents seeking a dynamic suburban lifestyle.
28. Brooklyn: Brooklyn is a vibrant district in Jacksonville, FL, known for its classic charm and friendly community. It includes a combination of residences, enterprises, and cultural landmarks that showcase the area's cultural wealth.
29. LaVilla: LaVilla is a historical area in Jacksonville FL, known for its extensive cultural legacy and vibrant arts environment. Once a flourishing African American community, it played a significant role in the city's music and entertainment history.
30. Durkeeville: Durkeeville is a historic in Jacksonville, Florida, known for its rich African American heritage and lively community. It features a mix of residential areas, local businesses, and cultural landmarks that reflect its long history in the city's history.
31. Fairfax: Fairfax is a vibrant neighborhood in Jacksonville, FL, known for its historic charm and close-knit community. It features a mix of houses, small businesses, and green spaces, offering a inviting atmosphere for residents and visitors alike.
32. Lackawanna: Lackawanna is a residential neighborhood in Jacksonville, Florida, known for its peaceful streets and neighborly atmosphere. It features a mix of private residences and small businesses, contributing to its cozy vibe within the city.
33. New Town: New Town is a well-known neighborhood in Jacksonville, FL, known for its vibrant community spirit and deep cultural heritage. It features a combination of residential areas, local businesses, and community organizations working to improve and upgrade the district.
34. Panama Park: Panama Park is a housing neighborhood in Jacksonville, FL, known for its quiet streets and community atmosphere. It offers convenient access to local amenities and parks, making it an desirable area for households and working individuals.
35. Talleyrand: Talleyrand is a historic neighborhood in Jacksonville, Florida, known for its residential charm and proximity to the St. Johns River. The area boasts a mix of older homes and local businesses, reflecting its strong community heritage.
36. Dinsmore: Dinsmore is a living neighborhood located in Jacksonville, Florida, known for its peaceful streets and community-oriented atmosphere. It features a mix of single-family homes and local amenities, offering a neighborhood feel within the city.
37. Garden City: Garden City is a vibrant neighborhood in Jacksonville, FL, known for its mix of houses and local businesses. It offers a friendly community atmosphere with quick access to city amenities.
38. Grand Park: Grand Park is a lively neighborhood in Jacksonville, Florida, known for its historic charm and diverse community. It features tree-lined streets, local parks, and a variety of small businesses that contribute to its friendly atmosphere.
39. Highlands: Highlands is a lively neighborhood in Jacksonville, FL known for its attractive residential streets and local parks. It offers a blend of historic homes and modern amenities, creating a welcoming community atmosphere.
40. Lake Forest: Lake Forest is a housing neighborhood located in Jacksonville, Florida, known for its calm streets and family-friendly atmosphere. It features a mix of single-family homes, parks, and local amenities, making it a attractive community for residents.
41. Paxon: Paxon is a residential neighborhood located in the west part of Jacksonville, Florida, known for its mixed community and affordable housing. It features a mix of single-family homes and local businesses, contributing to its friendly, suburban atmosphere.
42. Ribault: Ribault is a vibrant neighborhood in Jacksonville, Florida, known for its multicultural community and neighborhood appeal. It features a mix of historic homes and local businesses, enhancing its unique cultural identity.
43. Sherwood Forest: Sherwood Forest is a housing neighborhood in Jacksonville, FL, known for its shaded streets and welcoming atmosphere. It features a combination of historic and modern homes, offering a quiet suburban feel close to city amenities.
44. Whitehouse: Whitehouse is a residential neighborhood located in Jacksonville, Florida, known for its calm streets and friendly atmosphere. It features a mix of single-family homes and local amenities, making it a well-liked area for families and professionals.
45. Cedar Hills: Cedar Hills is a vibrant neighborhood in Jacksonville, FL, known for its varied community and convenient access to local amenities. It offers a blend of residential and commercial areas, adding to its energetic and welcoming environment.
46. Grove Park: Grove Park is a housing neighborhood in Jacksonville, Florida, known for its delightful vintage homes and canopied streets. It offers a tight-knit community atmosphere with quick access to downtown services and parks.
47. Holiday Hill: Holiday Hill is a housing neighborhood in Jacksonville, Florida, known for its calm streets and close-knit community. It offers convenient access to local parks, schools, and shopping centers, making it a attractive area for families.
48. Southwind Lakes: Southwind Lakes is a housing neighborhood in Jacksonville, FL known for its peaceful lakes and tidy community spaces. It offers a calm suburban atmosphere with convenient access to local amenities and parks.
49. Secret Cove: Secret Cove is a serene waterfront neighborhood in Jacksonville, FL, known for its calm atmosphere and beautiful views. It offers a combination of residential homes and natural landscapes, making it a popular spot for outdoor enthusiasts and families.
50. Englewood: Englewood is a lively neighborhood in Jacksonville, FL, known for its varied community and strong cultural heritage. It offers a combination of residential areas, local businesses, and recreational spaces, making it a bustling part of the city.
51. St Nicholas: St. Nicholas is a historic neighborhood in Jacksonville, Florida, known for its attractive early 20th-century architecture and lively community atmosphere. It offers a mix of residential homes, local businesses, and cultural landmarks, making it a distinctive and inviting area within the city.
52. San Jose: San Jose is a lively district in Jacksonville, FL, known for its housing areas and shopping zones. It offers a blend of suburban living with close proximity to parks, retail options, and dining.
53. Pickwick Park: Pickwick Park is a housing neighborhood in Jacksonville FL, known for its quiet streets and close-knit atmosphere. It features a mix of detached houses and local amenities, making it a popular area for families and professionals.
54. Lakewood: Lakewood is a dynamic neighborhood in Jacksonville, FL known for its classic charm and varied community. It features a combination of residences, local shops, and parks, offering a welcoming atmosphere for residents and visitors alike.
55. Galway: Galway is a housing neighborhood in Jacksonville, FL, known for its suburban atmosphere and neighborly living. It features a combination of detached houses and local amenities, providing a peaceful and kid-friendly environment.
56. Beauclerc: Beauclerc is a living neighborhood in Jacksonville FL, known for its peaceful streets and family-friendly atmosphere. It offers a mix of single-family homes and local amenities, making it a popular choice for residents seeking a suburban atmosphere within the city.
57. Goodby's Creek: Goodby's Creek is a residential neighborhood in Jacksonville, FL, known for its peaceful atmosphere and proximity to nature. It offers a mix of suburban living with easy access to local amenities and parks.
58. Loretto: Loretto is a classic neighborhood in Jacksonville, Florida, known for its attractive residential streets and tight-knit community atmosphere. It features a variety of architectural styles and offers easy access to downtown Jacksonville and nearby parks.
59. Sheffield: Sheffield is a housing neighborhood in Jacksonville, FL, known for its calm streets and community-oriented atmosphere. It features a mix of private residences and local parks, making it a well-liked area for families.
60. Sunbeam: Sunbeam is a dynamic neighborhood in Jacksonville, FL, known for its appealing residential streets and strong community spirit. It offers a blend of historic homes and local businesses, creating a inviting atmosphere for residents and visitors alike.
61. Killarney Shores: Killarney Shores is a residential neighborhood in Jacksonville FL, Florida, famous for its tranquil streets and tight-knit community. It provides convenient access to nearby parks, schools, and shopping centers, making it a appealing area for families.
62. Royal Lakes: Royal Lakes is a living neighborhood in Jacksonville, Florida, known for its peaceful environment and kid-friendly atmosphere. It features well-kept homes, local parks, and convenient access to nearby schools and shopping centers.
63. Craig Industrial Park: Craig Industrial Park is a business and industrial area in Jacksonville, FL, known for its variety of storage facilities, production plants, and distribution centers. It serves as a vital hub for local businesses and contributes greatly to the city's economy.
64. Eastport: Eastport is a lively neighborhood in Jacksonville, FL, known for its historic charm and waterside views. It offers a blend of residential areas, local businesses, and recreational spaces along the St. Johns River.
65. Yellow Bluff: Yellow Bluff is a residential neighborhood in Jacksonville, Florida, known for its calm streets and close-knit community. It offers a mix of residential homes and community amenities, providing a comfortable living environment.
66. Normandy Village: Normandy Village is a residential neighborhood in Jacksonville, FL, famous for its mid-century residences and kid-friendly setting. It provides convenient access to local recreational areas, educational institutions, and retail centers, making it a preferred choice for residents.
67. Argyle Forest: Argyle Forest is a residential neighborhood in Jacksonville, FL, famous for its family-oriented environment and easy access to retail and educational institutions. It includes a variety of single-family homes, parks, and recreational facilities, rendering it a favored choice for living in the suburbs.
68. Cecil Commerce Center: Cecil Commerce Center is a extensive industrial & commercial district in Jacksonville FL, known for its strategic location and comprehensive transportation infrastructure. It serves as a center for logistics, manufacturing, & distribution businesses, contributing significantly to the local economy.
69. Venetia: Venetia is a living neighborhood in Jacksonville, Florida, known for its quiet streets and family-friendly atmosphere. It offers easy access to local parks, schools, and shopping centers, making it a well-liked area for families.
70. Ortega Forest: Ortega Forest is a pleasant neighborhood community in Jacksonville, FL, known for its historic homes and lush, tree filled streets. It offers a calm suburban atmosphere while being easily close to downtown Jacksonville.
71. Timuquana: Timuquana is a residential neighborhood located in Jacksonville, Florida, known for its tranquil streets and community parks. It offers a mix of single-family homes and easy access to local facilities and schools.
72. San Jose Forest: San Jose Forest is a housing neighborhood located in Jacksonville, Florida, known for its lush greenery and family-friendly atmosphere. The area features a mix of detached houses and local parks, offering a quiet suburban environment.
73. E-Town: E-Town is a lively neighborhood located in Jacksonville, Florida, known for its multicultural community and historic significance. It features a blend of residential areas, local businesses, and cultural landmarks that add to its unique character.

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8400 Baymeadows Way Suite 1, Jacksonville, FL 32256, United States

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boldcityac.com

boldcityac.com

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6C9C+2H Baymeadows Center, Jacksonville, FL, USA

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From the owner

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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4.9

1,687 reviews

"Best price and service I have ever had with an HVAC partner"

"Excellent workmanship, knowledgeable, friendly staff from owner to employees."

"They’ve been charging the service contract now the unit does not work."

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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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Bold City Heating & Air

HVAC & Air Conditioning Repair in Jacksonville, FL

Bold City offers premium HVAC service and competitive pricing to the Jacksonville, Jacksonville Beaches and Ponte Vedra areas.

24/7 Fast and Reliable. Jacksonville Grown. Family Owned & Operated.

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Summer HVAC Tune Up for Just $89

Get your system ready for the heat!

We’ll inspect, clean, and fine tune your HVAC to boost efficiency, prevent breakdowns, and keep you cool all season long.

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Jacksonville’s Best HVAC Company

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At Bold City Heating & Air, we offer our customers exceptional service when it comes to HVAC in Jacksonville, FL.

From heating and cooling repairs to energy-efficient HVAC installations that save you money, we do it all. When we opened our family-owned business in 2016, we knew we wanted to be the best around and that’s a passion that still stands.

From the moment you call us to the moment we carry out our work, you can depend on us. We believe in clear upfront pricing, no hidden costs, and the highest level of workmanship. With our NATE-certified technicians and Energy Star systems we give you the perfect combination of choice, value, and customer care.
“Experience the Bold Difference” that is Bold City Heating & Air by calling us today!

We Believe In:

Clear Upfront Pricing

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High-Level Workmanship

Trusted Heating and Air Pros in Jacksonville

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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.

Satisfaction Guaranteed

Prioritizing satisfaction, Bold City Heating & Air exemplifies customer service.

Our Team Will:

• Keep Your Informed
• Target Your Goals

• Provide Honest Answers

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Heating

Duct Cleaning

Maintenance

New System Installation

Number One For Heating & Cooling

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Keeping you comfortable is our top priority!

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.

Jacksonville Grown. Family Owned & Operated.

See What Our Customers Are Saying About Us!

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Previous

Recently moved here from MD and was not familiar with the heating/AC unit. Bold City, especially Sam Powel, has been VERY helpful. In our short time here in FL, we have recommended Bold City to acquaintances numerous times, and will continue to do so.

Paul G.

Another excellent job by Bold City. Bryan was on time, thorough, explained his analysis and solution, and completed the job. He demonstrated knowledge and expertise while providing a high level of customer service. Well done!!

John L.

Recently moved here from MD and was not familiar with the heating/AC unit. Bold City, especially Sam Powel, has been VERY helpful. In our short time here in FL, we have recommended Bold City to acquaintances numerous times, and will continue to do so.

Paul G.

Another excellent job by Bold City. Bryan was on time, thorough, explained his analysis and solution, and completed the job. He demonstrated knowledge and expertise while providing a high level of customer service. Well done!!

John L.

Recently moved here from MD and was not familiar with the heating/AC unit. Bold City, especially Sam Powel, has been VERY helpful. In our short time here in FL, we have recommended Bold City to acquaintances numerous times, and will continue to do so.

Paul G.

An HVAC Team You Can Trust

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When you’re looking for an HVAC company that you can count on, look no further than Bold City Heating & Air.

Why not try out our award-winning service for yourself? We promise to never give you the upsell. Our technicians don’t get paid commission and we don’t focus on profit margins. We know that if we give our customers the best service, our profits will look after themselves. Whether you’re looking for heating and cooling repairs in Jacksonville or you need HVAC installation or maintenance, speak to our friendly family-owned team.

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!

Contact Your Bold City Specialist Today

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Air conditioning

From Wikipedia, the free encyclopedia

This article is about cooling of air. For the Curved Air album, see Air Conditioning (album). For a similar device capable of both cooling and heating, see Heat pump.

"a/c" redirects here. For the abbreviation used in banking and book-keeping, see Account (disambiguation). For other uses, see AC.

There are various types of air conditioners. Popular examples include: Window-mounted air conditioner (China, 2023); Ceiling-mounted cassette air conditioner (China, 2023); Wall-mounted air conditioner (Japan, 2020); Ceiling-mounted console (Also called ceiling suspended) air conditioner (China, 2023); and portable air conditioner (Vatican City, 2018).

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]

Main article: Vapor-compression refrigeration

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]

Main article: Heat pump

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]

Main articles: coefficient of performance, Seasonal energy efficiency ratio, and European seasonal energy efficiency ratio

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 BTU_IT 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]

Main articles: Remote control and Infrared blaster

A wireless remote controller

The infrared transmitting LED on the remote

The infrared receiver on the air conditioner

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]

Main article: Thermostat

Several wired controllers (Indonesia, 2024)

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]

See also: Chiller

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]

Main article: Packaged terminal air conditioner

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]

Main article: Rotary-screw compressor

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]

This section is an excerpt from 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]

This section is an excerpt from 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]

Main article: Ceiling fan

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]

Main article: Evaporative cooler

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

References

[edit]

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