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D&K Heating & Air Conditioning
“I already referred them to my girlfriend and she's getting her house done now too!”
Best HVAC Contractors in Fairfield, CA
24 companies listed · 7 in Fairfield · 3 open 24/7 · 12 open weekends · 22 rated 4.5+
Data verified October 18, 2026
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Dooley's Heating and Air
- Crew
- Informative
“The workers were very kind and professional, showed us the ins and outs of everything they installed, helped us setup and understand the new thermostats.”
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Village Chimney Services Inc
- Price
“After retiring I even taught customer service at the local EDD office for men and women e looking to return to the work industry and for companies that had employees who needed a refresher course in customer service.”
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Golden State Comfort Systems
- Price
- Communication
- Furnace
“The trouble was that even as quick as they were, the heater seemed to have fixed itself by the time they got here, and it is difficult to fix what isn't broken!”
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Indoor Air Technologies
“I am about 4 months late in writing this review for the incredible job that the owner Andrew Meeks and his very competent crew of Jesus and Omar did in installing a Mitsubishi Multi Zone Cassette Mini Split System on the second floor of our home.”
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A-1 Comfort Heating AND AIR
“So I called A-1 for a second opinion and was happy to find out they could repair my current A/C unit and it didn't need to be replaced.”
The 24 companies listed for Fairfield, CA work on furnaces, heat pumps and air conditioners. Each profile repeats what the company publishes about its hours, its license and the equipment it fits, alongside ratings and quotes drawn from public reviews.
Area overview: Fairfield, CA
Of the 24 companies we list here, 7 are in Fairfield itself and 17 come from towns including Vacaville (10, 8 mi), Napa (3, 15 mi) and Benicia (2, 15 mi). The companies on this page are rated from 3.8 to 5.0 across 5,645 reviews; 15 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (90%), responsiveness (88%) and quality (82%). The topics that come up most in reviews of the companies on this page are "price", "communication" and "efficient". 3 are open around the clock; 12 are open on Saturdays and 8 on Sundays. The services the companies on this page list most often on their websites are heating (4), air conditioning (3), indoor air quality (3) and ventilation (2). 11 show a license on their websites and 4 list staff certifications (EPA and NATE). 12 have ten or more years of experience, the longest 49 years. 5 offer emergency call-outs; 6 offer financing or payment plans; 7 give free estimates; 5 are family- or locally-owned and 10 list coupons or special offers. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Do any heating firms listed for Fairfield work on Saturdays or Sundays?
Saturday or Sunday hours show up for 12 of the 24 companies here. Saturdays fill with the calls that came in on Friday, so ask whether you are getting a repair slot or a sales visit. Sunday work is usually treated as an emergency call.
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Suisun Valley Sheetmetal
“Suisun Valley sheet metal heating and air is a good company Ive been working with them for going on 4 years now”
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A-1 Guaranteed Heating & Air
- Furnace
- Attic
- Clean
“It was a little tricky figuring out the appropriate settings to achieve the heating levels that we wanted, but the company was very responsive and quick to send someone out to check things out for us.”
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Precision Air Solutions
- Price
- DJ
- Job
“Chris was knowledgeable and helped us pick the right furnace and a/c units to replace the central air units we had He was reasonable and a pleasure to work with throughout the process, was fair in dealing with the unexpected, and he and his team w...”
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Cozy Home Services
- Furnace
- Project
- Efficient
“Excellent mechanic Chris did a great job on getting our air conditioning up and running in a timely manor … we appreciate Chrises explanation on what happened and why the air conditioning unit was not working properly… Chris got the unit back up and...”
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Advanced Plumbing Heating and Air
- Technician
- Inspection
- Hvac
“The professionals at advanced plumbing and heating Jason was kind, respectful, courteous, and treated my home and family members with respect, he got the job done thoroughly explained what he was doing why he was doing it and things that I could do i...”
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Fuse Hvac & Appliance Repair Napa
- Communication
- Leaking
- Tech
“First time using Fuse services, and definitely recommend this company, Jason our technician was super fast and knowledgeable getting to the issue of my fridge super fast.”
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Alamo Heating and Cooling Inc
- Price
- Capacitor
- Inspection
“After it was determined that there were multiple points of rat-attack inside the ducting through inspection (this matched what was blowing out our vents, originally), it was recommended that we have all soft tubing be replace and to have the deodoriz...”
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Environmental Heating and Air Solutions
- Questions
- Inspection
- Sales
“Every part of the process was been so perfect: from the moment the sales rep (Mathew) walked us through options in the decision-making - with his knowledge of the systems and his patience in helping us understand what would be best for our needs; thr...”
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All Weather Heating & Air Conditioning
- Call
- Morning
- Furnace
“Unfortunately, the reason I was turning it on that day was because it's Vacaville and it was already getting very hot out and our house was starting to get too warm for comfort, not because I was prepared and checking the system before I need it of c...”
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Rendon Heating & Air
- Diagnosed
- Veteran
- Communication
“I was grateful and thankful RENDON HEATING AND AIR came out when they said they would, on time two the two young men that came out definitely tried to diagnose the issue that of coarse went away when the experts came by.”
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Renner Heating & Air Conditioning
- Price
- Knew
- Information
“So I called Justin and he was able to diagnose the issue, clean the blower by taking it apart and reassembing, replace the parts not functioning correctly and even fixed a mistake made by the previous company which actually could have shorted out our...”
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Right Now Air & Solar
- Informative
- Whole House Fan
- Tech
“Raul, my technician did an awesome job, what I like about him is he didn't take any shortcuts, was very thorough on his work and explained everything so I can understand what is going on, thank you once again Raul!”
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Warm Corp West
- Floors
- Heating System
- Water Heater
“I have had Warm floors as our heating system for 20 years and this is the first time I had an issue, so I called them for a service call and everyone who I talked to from Kim, the Office Manager, to Jordan, the Schedule Coordinator, to Sergio, the S...”
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Bell Products
- Work Ethic
- Understand
- Conscientious
“Scott Fletcher was my tech he was great, friendly, professional and very knowledgeable about my system, and was able to help me understand the system better.”
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Greiner Heating
- Job
- Pictures
- Inspection
“He also scheduled another appointment with the service coach to come along with him, for the following week regarding a follow-up for something that was done about 2 years ago to make sure that there was no leak in our system.”
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Electrify My Home
- Heat Pump
- Rebates
- Furnace
“Understanding that accidents do happen, you stood behind your work and went beyond what was required to ensure that we were satisfied, such as repairing our wood floor after a tool was dropped, repairing and painting our ceiling due to a mishap, and ...”
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A 100% Guarantee Heating & AC Llc.
- Job
- Honest
- Unit
“They worked tirelessly for seven hours straight until 8:30 at night to correct the problems and get the job close to completion returning the following day when there was light to complete the project and test the system.”
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R.C. Heating & Cooling
- Price
- Cost
- Inspection
“I tried calling another company who was going to charge over $500 for just the part and that was their discounted rate if I enrolled in a maintenance plan!”
HVAC, Heating & AC Services in Fairfield, CA Cost Estimates
Minimum cost
$2073
Maximum cost
$12424
National Average
$6468
Avg Per Hour Rates
$172
$4440
$8573
Fair price range is based on 453 cost profiles
Why these companies made our list
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