We take pride in the excellence of our work and our commitment to all of our clients. We are helping homeowners and business owners by providing quality service at a fair price. Whether you need your existing Heating or Air Conditioning system repaired or replaced.

In 1971, Connolly HVAC opened its doors to provide heating and cooling services throughout Contra Costa County. Dedicated to providing industry-leading HVAC services, our team designs and installs HVAC systems, cleans air ducts, and provides other services that improve indoor air quality for residential and commercial clients. Our company is also qualified to assess how customers are using energy and... Read More about Connolly Heating and Air Conditioning