• 571-385-3110
  • Five Star Guarantee
  • Year Established: 1979
  • License Number(s): 2705020470
  • Family Owned & Operated
  • 24/7 Emergency Service
  • Free Estimates
  • Licensed
"Since 1979, Brennan's Heating & Air Conditioning has 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!"

Don Brennan, Owner
Principal Owners / Key Managers
Don Brennan, Owner & President
Mike Brennan, Vice President
Liz Cain, Office Manager
Joe English, Service Manager
Five Star Guarantee
We stand behind every Five Star Rated company with Our Guarantee. We've done the research for you and identified the best home service pros in your neighborhood.
Homeowner Reviews

“Adam was a true professional and did a terrific job! everything we would expect from Brennan's!”

“I have been a customer of Brennan's for over 30 years and have received nothing but the best service from the whole team.”

“Today I had Tyler Ahern do a major repair on my system. He definitely displayed uncompromising customer service, superior craftsmanship, and a most pleasant and positive work ethic. I've been with Brennans for many years and even have you service my rental property. All workers are very good.”

“The crews? work was beautiful, and the furnaces worked perfectly from the beginning. Neal Kincheloe is a very professional sales rep, also. Everyone that I dealt with at Brennan's Heating and Air Conditioning has been very pleasant. I would highly recommend Brennan's to anyone needing their HVAC systems repaired or replaced.”

“I was very pleased with the knowledge and level of service the sales, financing, and installation staff provided.”

“Love the new unit, work much better than our old unit. The installers were very professional, courteous and knowledgeable.”

“I've been with Brennan's Heating & Air Conditioning for many years and even have them service my rental property. All workers are very good.”

“I was very pleased with the knowledge and level of service the sales, financing, and installation staff provided.”

  • 571-385-3110
  • Five Star Guarantee
  • Year Established: 1979
  • License Number(s): 2705020470
  • Family Owned & Operated
  • 24/7 Emergency Service
  • Free Estimates
  • Licensed
"Since 1979, Brennan's Heating & Air Conditioning has 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!"

Don Brennan, Owner
Principal Owners / Key Managers
Don Brennan, Owner & President
Mike Brennan, Vice President
Liz Cain, Office Manager
Joe English, Service Manager
Services Offered
24-hour emergency service on all makes and models
Planned maintenance agreements
Installation of high-efficiency air conditioning, gas furnaces, water heaters, and heat pump systems
Indoor air quality and duct cleaning
Free estimates on new HVAC equipment
Insurance
General Liability & Workers' Compensation
Warranties / Guarantees
100% satisfaction guarantee
2-year labor warranty on all new complete system installations
1-year warranty on all service repairs
Extended parts and labor warranties available
Recognitions
NATE-certified technicians on staff
A+ Rated and Accredited with the BBB
Carrier Factory Authorized Dealer
Carrier President's Award winner 2019-2021