We are Northern Californias premier installer of Commercial and Residential Air Conditioners & Heaters. Our professional team of technicians are available to service any size or type of system. We provide heating and air conditioning services for large and small retail stores, malls, restaurants, warehouses, apartments, hotels, offices, medical buildings, hospitals and any other commercial buildings. We dont stop there, Dennis Heating and Air works in residential areas too, and will provide your home with comfort and warmth in the winter months and keep you cool in the summer. Our team of AC experts will install or retrofit your business or home with the latest in high performance equipment that is reliable and efficient. We invite you to read the testimonials from a few of our satisfied customers. Call us today to service your unit, install a split-system, or a heating and air conditioning unit for your home or your business. No job is too small or too large. At Dennis Heating and Air, your comfort is our priority!