Mannix Heating & Cooling - Gaithersburg

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7824 Beechcraft Ave
Gaithersburg, MD 20879
Mannix Heating & Cooling meets higher standards of quality. For heating, cooling and electrical needs in Gaithersburg, MD, Chantilly, VA and their surrounding areas and the surrounding areas, we offer home and business owners a comprehensive range of services, including installation, upgrades, seasonal maintenance, and prompt repair. We have earned distinction as a Carrier Factory Authorized Dealer, maintaining rigid criteria for customer satisfaction, technical expertise, and ethical business practices.

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5.03 reviews
Kathryn K.
10/24/2025

I have been with Mannix since they installed my new water heater in 2018. In these last 7 years I have never been disappointed or dissatisfied with their service. And today was no exception....

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Scott A.
5/17/2018

First off, we had an issue last weekend (right before the heat explosion) and Mannix came to the house early Friday. We needed a new motor for the fan in our furnace (Mannix also installed our...

Robin T.
10/27/2019

Mannix quote for heating and AC was much lower than the other quote I received. They were quick and professional; very polite. I had mold in the old unit. They came out immediately, assessed...

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