Welcome to Brennan’s Heating and Air Conditioning. Since 1979, we have been providing homeowners and businesses throughout Northern Virginia with our award-winning customer service, outstanding products, affordable prices, and superior workmanship. Whether you are in need of emergency service, preventive maintenance, a new HVAC system or you just want to learn more about how to reduce your monthly energy costs; our friendly and knowledgeable staff is always ready to help. We are here when you need us! We are so confident that you will be comfortable with our services that we back it up with our 100% satisfaction guarantee. Our service area includes all of Prince William County, Fairfax County, Stafford, Manassas, Gainesville, Alexandria, and Arlington, VA.