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Family-Owned Excellence Since 1885 · Serving Alexandria & Northern Virginia for 141 Years

SINCE 1885 · 141 YEARS OF SERVICE

Achieve Comfort
with Expert
HVAC Solutions.

For over 141 years, Thomas J. Fannon & Sons has been Alexandria's most trusted HVAC company. Family-owned, professionally operated, and committed to your comfort — every season, every year.

141
Years in Business
4.7★
Avg Rating
Free
Estimates

Speak With Us

Get a free estimate or schedule service today.

What We Do

Our Most Popular Services

At Thomas J. Fannon & Sons, we offer a range of HVAC services designed to keep your home comfortable year-round.

Air Conditioning

Air Conditioning

Keep cool all summer long. We install, repair, and maintain all major AC brands and systems for Alexandria area homes.

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Heat Pumps

Heat Pumps

Energy-efficient heating and cooling in one system. We specialize in modern inverter heat pump technology for year-round comfort.

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Gas Heating

Gas Heating

From furnaces to boilers, our technicians service and install all gas heating equipment with precision and care.

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Oil Heating

Oil Heating

Decades of experience with oil heating systems. We service, convert, and maintain oil equipment across Northern Virginia.

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Ductless Mini Splits

Ductless Mini Splits

Perfect for additions, sunrooms, and older homes. We install ductless systems from leading manufacturers.

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Water Heaters

Water Heaters

Hot water when you need it. We install and service traditional, tankless, and heat pump water heaters.

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Our Story

Family-Owned Excellence
Since 1885

In 1885, T.J. Fannon & Sons opened its doors at Duke and Henry Streets selling coal and wood. Over 141 years, we've grown alongside Alexandria — from coal delivery by mule cart to cutting-edge inverter heat pump technology.

We're deeply rooted in this community because it is our community. Tom and Jack Fannon carry on the family tradition of honest, expert service that Alexandria homeowners have relied on for generations.

141
Years Serving Alexandria
4.7★
Customer Rating
Free
Estimates Always
T.J. Fannon & Sons

Thomas J. Fannon & Sons is committed to quality — expect only the best HVAC services when you work with us.

Dedicated to professionalism and attention to detail since 1885.

CONTACT US TODAY
What Customers Say

Trusted by Alexandria Homeowners

★★★★★4.7· Nextdoor Neighborhood Favorite 4 Years Running
MT
Margaret T.
Feb 2026
★★★★★

"T.J. Fannon has been our HVAC company for over 20 years. They are honest, reliable, and always show up on time. When our furnace died on a cold night, they had a technician out within hours. Wouldn't trust anyone else."

DR
David R.
Jan 2026
★★★★★

"Incredible service. They installed a new heat pump system and the whole process was seamless. The technician explained everything clearly and the price was exactly as quoted. Highly recommend."

SK
Susan K.
Dec 2025
★★★★★

"Family-owned businesses like this are rare. They treat you like a neighbor, not a number. Been using them for 10 years and will continue to do so."

JL
James L.
Nov 2025
★★★★★

"Best HVAC company in Alexandria, period. Fast response, fair pricing, and the work is always done right the first time. 141 years in business for a reason."

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Areas We Serve

Alexandria, VAArlington, VAFairfax, VAFalls Church, VAMcLean, VASpringfield, VAAnnandale, VABurke, VA