Mini Split Installation & Repair

Kevin did a very thorough job.

They remembered me from a previous visit and checked on me a year later to tune up my air conditioner. I did not even know that air conditioner Tune ups was a thing. They came out and checked my freon levels, cleaned out debris and did other things to make sure my air conditioner was working as it should. I appreciate their attention to detail, they are courteous and efficient. They explained everything clearly and offered their tune up services on an annual basis which I gladly accepted. I highly recommend this company and the services they offer.

I have been using Contra Costa Heating & Air Conditioning for the past 10 years. My house has 2 HVAC systems that have been purchased and maintained by Contra Costa. They are extremely professional and very knowledgeable and always on time and deliver their projects within the time they promise. Due to a recent home renovation I had them move and add a few vents around my house. They sent someone to review and assess the system on Thursday and started the work and finished on Monday. These are honest and knowledgeable people that you can trust.

Tony and Kevin are very personable. Great customer service and did the job well of inspecting my system.

Kevin did a great job with the A/C Tune-up.

Super thorough! Excellent service!

Contra Costa H&AC came by today and it was a great experience. They were slightly late for the scheduled appointment, but immediately let me know when they knew they were going to be arriving with an accurate estimate. They were super knowledgeable and upfront providing everything I asked for (refrigerant adding + sealant) after doing their thorough testing. While our AC unit is definitely dated, I was very grateful they didn't try to force an upgrade on us. Thanks Tony & team!

Great service. They cleaned my unit very well

Had a really good experience with Contra Costa Heating & Air Conditioning. We went through their Costco partnership and had a new HVAC system installed in late Oct / Nov 2025. The install was smooth end to end, and the crew was professional, punctual, and easy to work with. They also removed an old thermostat and patched the drywall. The first patch wasn’t great, but I called them back and they sent someone out who fixed it properly. The wall looks good as new now. After the install, I noticed some uneven temperatures between zones. They came out, checked everything, and confirmed the thermostats were reading accurately. They even offered to replace them. I ended up resolving it myself by adjusting the system’s circulation settings, which improved airflow and evened things out. On pricing, their initial quote came in higher than a few other vendors. That’s mainly because they use higher quality equipment and components. When I asked other vendors to match the same setup, the pricing ended up pretty close anyway. Contra Costa also offers strong guarantees on workmanship and parts, which gave me more confidence going with them. If you’re just trying to get the cheapest install possible, they’re probably not the right fit. But if you care about doing it right and getting a solid system that will hold up over time, they’re a great choice. Overall, very happy with how everything turned out. The system is working well, and they were responsive whenever I needed follow-up.

The techs are very professional in a way that they explain the condition of the unit, what’s the cause of it and how they deal with it. After the inspection they will tell you the area(s) that need any further attention. The whole time they are very friendly and patience.

Great service, very professional.

Katie on the phone was very helpful with scheduling and Claudio who came out to the house was GREAT. He explained all the thing he did and why we had issues and resolved them on the spot! Fully tested out the system before leaving

Professional HVAC service with quick diagnosis and efficient repair.

The technician arrived on time and fixed our heating issue the same day.

Excellent installation of our new air conditioning system. Everything works perfectly.

Very knowledgeable team that explained the system and maintenance clearly.

Reliable service with fair pricing and quality workmanship.

Our furnace replacement was handled smoothly from start to finish.

Honest recommendations and no pressure sales approach.

The system upgrade improved our home's comfort immediately.