95/100CR Score
Ranked #1 because of its Google rating and availability: 4.9★ from 6,908 Google reviews, open 24/7.
- 4.9★ from 6,908 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 227 E Deer Park Dr, Gaithersburg, MD 20877
Best HVAC Contractors in Germantown, MD (2026)
827 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Germantown: GAC Services, CR Score 95/100; 4.9★ from 6,908 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Presidential, Inc., posts 24/7 hours; ranked #2 of 827.
- 21
Most-reviewed: Len The Plumber Heating & Air, LLC, 8,136 Google reviews at 4.6★, the most of 827 ranked; ranked #21.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
827 Germantown HVAC contractors are ranked here by CR Score, from 8 published factors. 242 are open 24/7, 547 open Saturdays and 390 open Sundays, based on posted hours. The median Google rating is 4.9★ across 827 rated businesses.
Top 10 HVAC contractors in Germantown at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | GAC Services | 95 | 4.9★ (6,908) | Gaithersburg, 6 mi away | 24/7 | Overall |
| 2 | Presidential, Inc. | 93 | 4.9★ (1,701) | Gaithersburg, 6 mi away | 24/7 | Emergencies |
| 3 | Michael Bonsby HVAC, Plumbing & Electrical | 92 | 4.8★ (2,083) | Gaithersburg, 6 mi away | 24/7 | — |
| 4 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 92 | 4.7★ (5,985) | Rockville, 9 mi away | 24/7 | — |
| 5 | Parker Pearce Service Experts | 92 | 4.8★ (1,700) | Gaithersburg, 6 mi away | 24/7 | — |
| 6 | Meade's Heating and Air | 91 | 5.0★ (1,428) | Sterling, 13 mi away | 24/7 | — |
| 7 | Cardinal Plumbing Heating & Air Inc | 91 | 4.9★ (2,958) | Sterling, 15 mi away | 24/7 | — |
| 8 | Making Air Right | 91 | 4.9★ (361) | Clarksburg, 3 mi away | 24/7 | — |
| 9 | AllTech Services, Inc | 91 | 4.9★ (2,807) | Sterling, 16 mi away | 24/7 | — |
| 10 | Snell Home Services | 91 | 4.8★ (5,283) | Sterling, 16 mi away | 24/7 | — |
The 827 best HVAC contractors in Germantown, ranked
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Gaithersburg, 6 mi away
93/100CR ScoreRanked #2 because of its Google rating and availability: 4.9★ from 1,701 Google reviews, open 24/7.
- 4.9★ from 1,701 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8000 Cessna Ave, Gaithersburg, MD 20879
Based in Gaithersburg, 6 mi away
92/100CR ScoreRanked #3 because of its Google rating and availability: 4.8★ from 2,083 Google reviews, open 24/7.
- 4.8★ from 2,083 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7940 Cessna Ave, Gaithersburg, MD 20879
Based in Rockville, 9 mi away
92/100CR ScoreRanked #4 because of its Google rating and availability: 4.7★ from 5,985 Google reviews, open 24/7.
- 4.7★ from 5,985 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 685 Lofstrand Ln, Rockville, MD 20850
Based in Gaithersburg, 6 mi away
92/100CR ScoreRanked #5 because of its Google rating and availability: 4.8★ from 1,700 Google reviews, open 24/7.
- 4.8★ from 1,700 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7901 Beechcraft Ave Suite C, Gaithersburg, MD 20879
Based in Sterling, 13 mi away
91/100CR ScoreRanked #6 because of its Google rating and availability: 5.0★ from 1,428 Google reviews, open 24/7.
- 5.0★ from 1,428 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45975 Nokes Blvd Suite 100, Sterling, VA 20166
Based in Sterling, 15 mi away
91/100CR ScoreRanked #7 because of its Google rating and availability: 4.9★ from 2,958 Google reviews, open 24/7.
- 4.9★ from 2,958 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 104 Carpenter Dr Suite D, Sterling, VA 20164
Based in Clarksburg, 3 mi away
91/100CR ScoreRanked #8 because of its Google rating and availability: 4.9★ from 361 Google reviews, open 24/7.
- 4.9★ from 361 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Sterling, 16 mi away
91/100CR ScoreRanked #9 because of its Google rating and availability: 4.9★ from 2,807 Google reviews, open 24/7.
- 4.9★ from 2,807 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 101-A Executive Dr STE 200, Sterling, VA 20166
Based in Sterling, 16 mi away
91/100CR ScoreRanked #10 because of its Google rating and availability: 4.8★ from 5,283 Google reviews, open 24/7.
- 4.8★ from 5,283 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 22977 Eaglewood Ct STE 130, Sterling, VA 20166
Based in Gaithersburg, 6 mi away
90/100CR ScoreRanked #11 because of its Google rating and availability: 4.8★ from 666 Google reviews, open 24/7.
- 4.8★ from 666 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 18918 Premiere Ct, Gaithersburg, MD 20879
#12 M.E. Flow
Based in Leesburg, 15 mi away
90/100CR ScoreRanked #12 because of its Google rating and availability: 4.8★ from 3,718 Google reviews, open 24/7.
- 4.8★ from 3,718 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 12 Cardinal Park Dr SE STE 107, Leesburg, VA 20175
Based in Sterling, 14 mi away
90/100CR ScoreRanked #13 because of its Google rating and availability: 4.9★ from 1,501 Google reviews, open 24/7.
- 4.9★ from 1,501 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45681 Oakbrook Ct STE 101, Sterling, VA 20166
Based in Ashburn, 13 mi away
90/100CR ScoreRanked #14 because of its Google rating and availability: 4.8★ from 2,314 Google reviews, open 24/7.
- 4.8★ from 2,314 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 20145 Ashbrook Pl #110, Ashburn, VA 20147
Based in Gaithersburg, 5 mi away
90/100CR ScoreRanked #15 because of its Google rating and availability: 4.9★ from 298 Google reviews, open 24/7.
- 4.9★ from 298 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 30 N Summit Ave Unit 2, Gaithersburg, MD 20877
#16 CroppMetcalfe
Based in Fairfax, 21 mi away
90/100CR ScoreRanked #16 because of its Google rating and availability: 4.8★ from 7,638 Google reviews, open 24/7.
- 4.8★ from 7,638 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8421 Hilltop Rd, Fairfax, VA 22031
Based in Sterling, 13 mi away
90/100CR ScoreRanked #17 because of its Google rating and availability: 4.8★ from 1,701 Google reviews, open 24/7.
- 4.8★ from 1,701 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45921 Maries Rd, Sterling, VA 20166
Based in Ashburn, 15 mi away
90/100CR ScoreRanked #18 because of its Google rating and availability: 5.0★ from 710 Google reviews, open 24/7.
- 5.0★ from 710 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 20931 Ashburn Rd Suite 200, Ashburn, VA 20147
#19 United Air Temp
Based in Sterling, 15 mi away
90/100CR ScoreRanked #19 because of its Google rating and availability: 4.8★ from 2,161 Google reviews, open 24/7.
- 4.8★ from 2,161 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 45570 Shepard Dr Ste. #6, Sterling, VA 20164
Based in Rockville, 10 mi away
89/100CR ScoreRanked #20 because of its Google rating and availability: 4.7★ from 1,402 Google reviews, open 24/7.
- 4.7★ from 1,402 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 802 Rockville Pike, Rockville, MD 20852
Based in Silver Spring, 17 mi away
89/100CR ScoreRanked #21 because of its Google rating and review volume: 4.6★ from 8,136 Google reviews, the most Google reviews on this list (8,136).
- 4.6★ from 8,136 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 550 Forest Glen Rd, Silver Spring, MD 20901
Based in Germantown
89/100CR ScoreRanked #22 because of its Google rating and availability: 4.9★ from 60 Google reviews, open 24/7.
- 4.9★ from 60 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 23108 Bank Barn Ct, Germantown, MD 20876
Based in Herndon, 16 mi away
89/100CR ScoreRanked #23 because of its Google rating and availability: 4.9★ from 745 Google reviews, open 24/7.
- 4.9★ from 745 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 464 Herndon Pkwy suite 216a, Herndon, VA 20170
Based in Fairfax, 21 mi away
89/100CR ScoreRanked #24 because of its Google rating and availability: 4.9★ from 1,794 Google reviews, open 24/7.
- 4.9★ from 1,794 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2800 Juniper St #10, Fairfax, VA 22031
Based in Gaithersburg, 5 mi away
89/100CR ScoreRanked #25 because of its Google rating and availability: 5.0★ from 85 Google reviews, open 24/7.
- 5.0★ from 85 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 18622 Cross Country Ln, Gaithersburg, MD 20879
HVAC contractors ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 827 ranked HVAC contractors here; the rest are on their profiles.
Also serving Germantown
20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| A Blessing Mechanical, LLC | 5.0★ (2) | 5 mi |
| Accomplish Heating & Air Conditioning | In Germantown | |
| AM/PM Emergency Services a division of Robert E Clubb & Associates | 5.0★ (2) | 13 mi |
| Bresee Brothers Construction | 4.0★ (4) | In Germantown |
| Ezzy Breezy Hvac Care | In Germantown | |
| Green HVAC Services | 5.0★ (2) | 11 mi |
| HANDYJUN | In Germantown | |
| Home Services at The Home Depot | 3.5★ (2) | In Germantown |
| Home Services at The Home Depot | 1.0★ (2) | 12 mi |
| JC & JC HVAC | 4.7★ (503) | 17 mi |
| Kensington Cooling & Heating | 5.0★ (2) | 14 mi |
| Michael & Son Services | 4.7★ (419) | 14 mi |
| Owens & Johnsons Heating and Cooling | 3.0★ (2) | 13 mi |
| P W Scholl Plumbing & Heating Inc | 5.0★ (2) | 5 mi |
| peter construction solution Llc | In Germantown | |
| Rockville Heating & Air Services | 5.0★ (2) | 6 mi |
| S.L. Johnson Plumbing & Heating | 3.0★ (2) | 9 mi |
| Santy and Sons HVAC | In Germantown | |
| Simply Home Service | In Germantown | |
| Vito Services | 4.7★ (1,351) | 9 mi |
How much do HVAC contractors cost in Germantown?
National price ranges in USD, not adjusted for Germantown. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
How to check an HVAC contractor's license in Maryland
In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors licenses Heating, ventilation, air conditioning and refrigeration work.
- Check that the status is active and the name matches the contract or truck.
- Ask for proof of insurance before work starts.
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
When to hire an HVAC contractor in Maryland
HVAC demand peaks in summer for cooling and in winter for heating. Spring and fall are the easiest times to book maintenance or a replacement.
How we ranked Germantown HVAC contractors
We scored 827 Germantown HVAC contractors on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Germantown data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |
HVAC contractors in Germantown: frequently asked questions
Who is the best HVAC contractor in Germantown?
By CR Score, the highest-ranked HVAC contractor in Germantown, MD is GAC Services with a CR Score of 95/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. Presidential, Inc. (#2) and Michael Bonsby HVAC, Plumbing & Electrical (#3) follow. We ranked 827 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Germantown?
ContractorsRanked ranks 827 HVAC contractors serving Germantown, MD. 2 of them are based in Germantown; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Germantown are open 24/7?
242 ranked HVAC contractors in Germantown post 24/7 hours. The highest-ranked are GAC Services (#1), Presidential, Inc. (#2) and Michael Bonsby HVAC, Plumbing & Electrical (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Germantown work on weekends?
547 of 827 ranked HVAC contractors post Saturday hours and 390 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), Presidential, Inc. (#2) and Michael Bonsby HVAC, Plumbing & Electrical (#3). Posted hours are office hours; crews may book weekend jobs separately.
How do I check an HVAC contractor's license in Maryland?
In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors handles licensing and covers Heating, ventilation, air conditioning and refrigeration work.
How much does ac replacement cost in Germantown?
AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Germantown. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Germantown HVAC contractors have?
The median Google rating among 827 rated HVAC contractors in Germantown is 4.9★, with a median of 26 reviews. Len The Plumber Heating & Air, LLC has the most, 8,136 reviews, and ranks #21. We adjust ratings for review count, so a few five-star reviews cannot top the list.
When is the best time to hire an HVAC contractor in Germantown?
HVAC demand peaks in summer for cooling and in winter for heating. Spring and fall are the easiest times to book maintenance or a replacement.
Update log for Germantown
- October 2026: CR Scores recalculated for 827 hvac contractors serving Germantown.
- October 2026: 4 duplicate listings merged.
More HVAC contractors and Germantown pages
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Other trades in Germantown
- Roofers in Germantown1465 ranked
- Plumbers in Germantown658 ranked
- Electricians in Germantown555 ranked
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- Landscapers in Germantown261 ranked
- Handymen in Germantown143 ranked
- Kitchen remodelers in Germantown1015 ranked
- Bathroom remodelers in Germantown995 ranked
- Flooring contractors in Germantown673 ranked
- Tile installers in Germantown76 ranked
- Drywall contractors in Germantown11 ranked
- Concrete contractors in Germantown261 ranked
- Fence contractors in Germantown167 ranked
- Deck builders in Germantown407 ranked
- Siding contractors in Germantown621 ranked
- Window installers in Germantown695 ranked
- Gutter installers in Germantown293 ranked
- Insulation contractors in Germantown116 ranked
- Solar installers in Germantown185 ranked
- Garage door repair companies in Germantown152 ranked
- Foundation repair companies in Germantown202 ranked
- Tree services in Germantown276 ranked
- Masonry contractors in Germantown273 ranked
- Water damage restoration companies in Germantown849 ranked
- Home builders in Germantown782 ranked
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- All contractors in Germantown