GAC Services
About GAC Services
GAC Services is a family-owned and operated HVAC, plumbing, and electrical company that has served Maryland since 1970. The company works with residential and commercial customers in Gaithersburg and across Montgomery, Frederick, Howard, and Carroll Counties. Cooling services include repair, replacement, and maintenance for central air conditioners, heat pumps, and ductless systems. Heating work covers furnaces and heat pumps, while plumbing services include drains, sewer lines, water heaters, leaks, pipes, fixtures, and sump pumps. Electrical services include panel upgrades, outlets, switches, lighting, surge protection, generators, and EV chargers. GAC also provides indoor air quality services and long-term system maintenance. Emergency heating, cooling, and plumbing services are available, and the company offers financing options for qualifying projects.
At a glance
- Trades
- HVAC, Plumbing, Electrical
- In business
- 56 years (since 1970)
- License
- d (as listed by the company, not yet verified)
- Service area
- Gaithersburg, Montgomery, Howard & Frederick, Electric
- Address
- 227 E Deer Park Dr, Gaithersburg, MD 20877
- Highlights
- Emergency serviceFinancing available
Services
- AC repair / service
- Heating repair
- Furnace service
- Heat pump service
- Ductless mini-split
- Thermostats
- HVAC maintenance
- HVAC installation
How the 90 score breaks down
Scores are calculated the same way for every company. See the method.
What customers say
Mel is very knowledgeable and provides great detail. Highly recommend
Google review, Oct 31, 2026
The excellent, thorough, courteous service rendered by the technician, Phillip. The next day there was a glitch with the system. I called GAC, and Phillip was able to return that day and solve the problem. Thank you very much for being there.
Google review, Oct 31, 2026
Read all 7,927 reviews on GoogleDwayne was very helpful and went above and beyond with our maintenance check.
Google review, Oct 31, 2026
Rating distribution and reviews from the company's public Google listing.
Other top HVAC companies near Rockville
- B&B Air Conditioning & Heating ServiceScore 79 · 4.9★ (823)
- NARFIX HEATING AND AIR CONDITIONING LLCScore 79 · 5.0★ (315)
- Glenmont Heating & Air ConditioningScore 76 · 4.9★ (499)
- Metro Services HVACScore 76 · 4.9★ (421)