Connolly Heating and Air Conditioning.

Your California
Air Care Specialists


Is your Furnace acting up, blowing cold air, or making too much noise? Don’t get left in the cold! Our experienced team of professionals is here to keep your home or business warm and cozy.


Connolly Heating and Air Conditioning is the leading company for all of your air conditioning and cooling needs. Our technicians are qualified professionals who will get the job done right for your home or business.


Regular Heating and Air Conditioning maintenance not only increases the reliability and efficiency of your equipment, it also extends its lifetime. Protect your investment with a maintenance agreement.


Did you know, indoor air can be two to five times more polluted than outside air? Breathe easy, knowing you have a trusted partner in Connolly Heating and Air Conditioning.


Designed to help you lower your home’s overall energy consumption as well as its effect on the environment, solar energy systems utilize the energy of the sun and convert it to lower electricity usage for you.

Industry-Leading HVAC Experts

ESTABLISHED IN 1992, Connolly Heating and Air Conditioning is an air care specialist that serves communities in Contra Costa County with superior heating and air conditioning services and products. Our team’s goal is to provide outstanding professionalism, premier solutions, and long-lasting results for residential and commercial customers. At Connolly Heating and Air Conditioning, we strive for 100 percent satisfaction in everything we do. Choose Connolly as your trusted HVAC provider!

Connolly service truck.

Our Latest Reviews

“Don’t go anywhere else. Just don’t. This company and staff exemplify premier service not often seen these days. Prices are fair and honestly kept. I contacted them for central air in my 1916 Victorian. Needless to say, there were many issues, problems and work-arounds needed, but Russ and Grayson worked tirelessly for two of the hottest days of summer and into the evening to accomplish the job. When they finished, everything worked perfectly and they left everything like they had never been there. I could not have asked for a better experience.”

- Rebecca C.

I was really impressed with your crew. Everyone was very attentive and helpful. I know how much it sucks to crawl under the house. They come out covered in insulation and don’t say anything negative. They quietly and quickly eat their lunches and get right back to work. I was relieved that the ENTIRE crew spoke English and there were no language barriers. Mike has been an absolute hoot to have around, he even let me pick the music. I was surprised that they remembered all of my dogs names. I was pleasantly surprised with the professionalism of your entire company and I’m so excited for my new system.

- P. J.

I just wanted to let you know, I was so impressed with your crew Dave and Nick. We have had bad experiences with contractors in the past with work not being done correctly, not being finished or permitted. It really warmed my heart when my small children stood in the garage and watched your crew and they did not mind. They even danced and swayed with the kids in the garage.  My youngest asked Nick questions about his blow torch and Nick told him all about it and finished by telling him to him to stay in school. Your company was referred to us by Patrick at Mold warriors, when I asked him about the quality of work done by your company he said he doesn’t refer his customers to bums. I’m so thankful that he had the insight to tell us about you.

- J. G.

We love hearing from our customers! If you've had us work on your HVAC system, we would love to hear from you too.

Leading our industry in air care comfort

We Have Financing Options Available!

We Service All Makes and Brands!

We’re a Carrier Factory Authorized Dealer

Carrier Authorized Dealers work hard for this designation. And all their experience and work is for one purpose—to create comfortable homes and satisfied customers. So when you need a new system, or it’s time to service or repair your current equipment, you can trust you’re working with the best in the business.

Carrier HVAC unit.

The Connolly Blog

What to Know About Carbon Monoxide Poisoning? Photo of a carbon monoxide detector in home.

What to Know About Carbon Monoxide Poisoning

By Connolly Heating & Air | May 12, 2023

Carbon monoxide (CO) poisoning is known as the silent killer for a reason—it can easily go undetected and cause illness and even death. It’s critical to learn how to prevent carbon monoxide leaks in your Walnut Creek home—as well as what the symptoms of carbon monoxide poisoning are in case you are exposed.

Image of an air vent. What You Should Know About Air Handlers.

What You Should Know About Air Handlers

By Connolly Heating & Air | April 14, 2023

An air handler works in tandem with your air conditioner or heat pump to help you get the most efficiency from your HVAC system.

5 Ways to Improve Your Indoor Air Quality. Image is a photograph of a small humidifier and plant on a white windowsill.

5 Ways to Improve Your Indoor Air Quality

By Connolly Heating & Air | March 10, 2023

What do you think of when you hear about air pollution? You might immediately imagine a giant cloud of smoke, cars spewing exhaust, or a trash incinerator––but have you ever thought about your own home in Concord?

Awards and Certifications

Carrier President's Award 2022.
Carrier President's Award 2021.

Our Maintenance Plans

Peace of mind with year-round protection!

What are you waiting for?

Contact us today!