Golden State Comfort Systems

Greg and his team were absolutely fantastic to work with from start to finish. In my experience, what really makes people choose an HVAC company comes down to trust, communication, honesty, pricing, and confidence that the job is going to be done right the first time — and Greg checks every one of those boxes. He’s incredibly knowledgeable, experienced, responsive, and easy to communicate with. You can immediately tell you’re dealing with someone who truly understands HVAC systems and has spent years mastering the trade. What I appreciated most was how honest and straightforward he was throughout the process. No pressure, no upselling, no trying to sell unnecessary upgrades — just real guidance on what made the most sense for the situation. Greg and his crew are especially impressive when it comes to residential furnace and AC replacements. Their installs are clean, professional, efficient, and thoughtfully done. They’re also great problem solvers and clearly know how to think outside the box when needed, which gives a lot of confidence on larger or more complicated jobs. Beyond the quality of work itself, they’re simply great people to have around — friendly, personable, respectful, hardworking, and professional. The kind of contractors you immediately feel comfortable recommending to family and friends. If you’re looking for an HVAC company that combines decades of experience, fair pricing, strong communication, and truly high-quality workmanship, I would absolutely recommend Greg and his team.

I have known Greg and Mark at Golden State Comfort Systems for many years. They're members of my business networking group as well. Greg and Mark are very knowledgeable and extremely thorough on the job. They sell Trane systems, which sell themselves. Greg and Mark have tremendous customer service and are a delight to work with. I highly recommend them for HVAC installation and repair!

Greg and Mark are amazing. My 23 year old AC decided to die during a heatwave 3 weeks ago. I reached out via Yelp and talked to Mark and Greg came out same day. Great communication via text. Super nice local Fairfield folks. VERY honest not trying to upsell me more expensive units and telling me what I really don't need and do. Took 1 1/2 days to do a full install of a new furnace and AC unit with testing. Fair price but mostly just cool guys who do great work and are easy to work with. HIGHLY recommend them. Thanks gents!

Wow! These guys are amazing! They came out to check out our cooler and it was too far gone, we new it was only a matter of time for our old system. So we had them put in a new Heating and cooling System. They helped us to select the right one for us. I was totally amazed by their ability to think outside the box. And a bonus, the air conditioner is as pretty as a new car. Lol. They were very personal and professional. Hard to find qualities now days. I would recommend them to everyone I know!

Mark and Greg are fantastic. Professional, knowledgable, communicative, patient, and punctual. I highly recommend them for any HVAC work. It started when my wife and I bought a new home in Fairfield and wanted to upgrade the 35 year old Honeywell thermostats to something digital/modern. I found the high ratings for Golden State Comfort Systems and called them up. They were at the house the next day. They did an inspection of the gas furnaces and AC units, explained they were functional but also 35 years old and likely to go out some day soon, but were otherwise functional. They topped up the refrigerant in the AC units without being asked and didn't charge us anything for it. I had these poor guys come over to the house three times to figure out why the new thermostat was rebooting constantly. We eventually came to the conclusion that the furnace powering the thermostat was tripping off and on and likely needed to be replaced. My wife and I thought about replacing the gas furnace but, with gas prices where they are, considered a heat pump. And with another furnace and 2 AC units also 35 years old, we went ahead and jumped on a full system replacement. Mark and Greg were immediately the chosen contractors. 2 hard days of work and we couldn't be happier. We went from a $150 thermostat to a full system replacement. Mark and Greg were never pushy, they were clear about options, patient, and we felt like we made the right decision because of their consultation. Outstanding work, guys, thank you.