Catering to Your HVAC Needs Since 1885

Thomas J. Fannon & Sons is proud to be the most trusted and most established HVAC contractor in Northern Virginia. We have been in the heating, air conditioning, and air quality business for 135 years.  If you live in Alexandria, Annandale, Arlington, Clifton, Fairfax, Falls Church, Lorton, McLean, or Springfield, chances are, we’ve provided you or your neighbor with our top-notch HVAC products and services.

What We Offer

Whether you live in a single-family home, a townhouse, or a condominium, or own a small business in the area, you can count on the Thomas J. Fannon & Sons’ team of HVAC professionals for high-quality home comfort equipment and dependable heating and cooling services.

For 135 years, we have been making good on our promise: to be professional and courteous at all times, while still prioritizing the needs and preferences of our customers.

We have a same-day installation policy on our water heaters, but we can also install boilers, furnaces, air conditioners, heat pumps, humidifiers, air cleaners, and even complex ductwork in a timely manner. When you choose us for your HVAC needs, you can rest assured that the job will be done right the first time around. We also believe that we are only as good as the products we offer, so we make it a point to offer nothing but the best equipment in the industry.

Our Service Areas

• Alexandria
• Annandale
• Arlington
• Burke
• Clifton
• Fairfax
• Fairfax Station
• Falls Church
• Fort Hunt
• Franconia
• Great Falls
• Gunston
• Herndon
• Kingstowne
• McLean
• Mount Vernon
• Oakton
• Reston
• Springfield
• Vienna