❄️ Official Rankings
10 Best HVAC in Gaithersburg, MD (August 2026)
We compared 10 hvac serving Gaithersburg and Montgomery County, Maryland, and ranked the top providers by verified reviews, ratings, and local reputation — 13,490 customer reviews in all.
The 10 listed below hold an average rating of 4.9 out of 5, led by Simply Home Service. Updated for August 2026.
- HVAC ranked
- 10
- Average rating
- 4.9★
- Reviews analyzed
- 13,490
- Area codes
- 301, 240
Simply Home Service
⭐ 5.0 · 204 reviews
11115 Sceptre Ridge Terrace, Germantown, MD 20876
Sichinava Heating and Air Conditioning
⭐ 5.0 · 162 reviews
396 N Summit Ave, Gaithersburg, MD 20877
GAC Services
⭐ 4.9 · 7549 reviews
227 E Deer Park Dr, Gaithersburg, MD 20877
Presidential, Inc.
⭐ 4.9 · 1831 reviews
8000 Cessna Ave, Gaithersburg, MD 20879
Smock Heating & Air
⭐ 5.0 · 87 reviews
7600 Rickenbacker Dr Ste M, Gaithersburg, MD 20879
Metro Services HVAC
⭐ 4.9 · 368 reviews
30 N Summit Ave Unit 2, Gaithersburg, MD 20877
B&B Air Conditioning & Heating Service
⭐ 4.9 · 340 reviews
7921 Queenair Dr #106, Gaithersburg, MD 20879
Atlantic Coastal Cooling and Heating, Inc. (ACCH)
⭐ 4.9 · 310 reviews
7845 Cessna Ave, Gaithersburg, MD 20879
Mannix Heating and Cooling- Gaithersburg
⭐ 4.9 · 172 reviews
7824 Beechcraft Ave, Gaithersburg, MD 20879
Michael Bonsby HVAC, Plumbing & Electrical
⭐ 4.8 · 2467 reviews
7940 Cessna Ave, Gaithersburg, MD 20879
HVAC listed here serve Gaithersburg, Montgomery County, and nearby ZIP codes including 20877, 20878, 20879, 20882, 20883, 20884, 20885, 20898, 20899.