64/100CR Score
Ranked #1 because of its Google rating and review volume: 4.9★ from 6,908 Google reviews, the most in Mount Airy.
- 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 Mount Airy, MD (2026)
442 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Mount Airy: GAC Services, CR Score 64/100; 4.9★ from 6,908 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): One Hour Air Conditioning & Heating® of Mount Airy, posts 24/7 hours; ranked #2 of 442.
- 6
Most-reviewed: F.H. Furr Plumbing, Heating, Air Conditioning & Electrical, 5,985 Google reviews at 4.7★, the most of 442 ranked after GAC Services; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
442 Mount Airy HVAC contractors are ranked here by CR Score, from ten published factors. 115 are open 24/7, 258 open Saturdays and 183 open Sundays, based on posted hours. The median Google rating is 4.9★ across 442 rated businesses.
Top 10 HVAC contractors in Mount Airy at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | GAC Services | 64 | 4.9★ (6,908) | Gaithersburg, 17 mi away | 24/7 | Overall |
| 2 | One Hour Air Conditioning & Heating® of Mount Airy | 64 | 4.7★ (852) | Mount Airy | 24/7 | Emergencies |
| 3 | Presidential, Inc. | 63 | 4.9★ (1,701) | Gaithersburg, 14 mi away | 24/7 | — |
| 4 | Michael Bonsby HVAC, Plumbing & Electrical | 62 | 4.8★ (2,083) | Gaithersburg, 14 mi away | 24/7 | — |
| 5 | Smock Heating & Air | 62 | 5.0★ (1,623) | Frederick, 12 mi away | Sat · Sun · Evenings | — |
| 6 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 62 | 4.7★ (5,985) | Rockville, 20 mi away | 24/7 | Most reviews |
| 7 | Parker Pearce Service Experts | 62 | 4.8★ (1,700) | Gaithersburg, 15 mi away | 24/7 | — |
| 8 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 62 | 4.7★ (1,847) | Eldersburg, 14 mi away | 24/7 | — |
| 9 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 62 | 4.8★ (4,514) | Baltimore, 22 mi away | 24/7 | — |
| 10 | Wenbrooke Services - Electrical, Plumbing, Heating and Air | 61 | 4.8★ (1,208) | Frederick, 15 mi away | 24/7 | — |
The 442 best HVAC contractors in Mount Airy, ranked
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Based in Mount Airy
64/100CR ScoreRanked #2 because of its Google rating and trade focus: 4.7★ from 852 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 852 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2702 Back Acre Cir, Mt Airy, MD 21771
Based in Gaithersburg, 14 mi away
63/100CR ScoreRanked #3 because of its Google rating and trade focus: 4.9★ from 1,701 Google reviews, listed on Google as “HVAC contractor”.
- 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, 14 mi away
62/100CR ScoreRanked #4 because of its Google rating and trade focus: 4.8★ from 2,083 Google reviews, listed on Google as “HVAC contractor”.
- 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 Frederick, 12 mi away
62/100CR ScoreRanked #5 because of its Google rating and trade focus: 5.0★ from 1,623 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 1,623 Google reviews
- Hours
- Mon–Sun 8 AM–8 PM
- Address
- 1539 Tilco Dr Unit 104, Frederick, MD 21704
Based in Rockville, 20 mi away
62/100CR ScoreRanked #6 because of its Google rating and trade focus: 4.7★ from 5,985 Google reviews, listed on Google as “HVAC contractor”.
- 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, 15 mi away
62/100CR ScoreRanked #7 because of its Google rating and trade focus: 4.8★ from 1,700 Google reviews, listed on Google as “HVAC contractor”.
- 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 Eldersburg, 14 mi away
62/100CR ScoreRanked #8 because of its Google rating and trade focus: 4.7★ from 1,847 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 1,847 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1584 Deer Park Rd, Finksburg, MD 21048
Based in Baltimore, 22 mi away
62/100CR ScoreRanked #9 because of its Google rating and trade focus: 4.8★ from 4,514 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 4,514 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2607 Rolling Rd. #201, Windsor Mill, MD 21244
Based in Frederick, 15 mi away
61/100CR ScoreRanked #10 because of its Google rating and trade focus: 4.8★ from 1,208 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 1,208 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4907 International Blvd #113, Frederick, MD 21703
Based in Frederick, 14 mi away
61/100CR ScoreRanked #11 because of its Google rating and trade focus: 4.8★ from 932 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 932 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5744 Industry Ln Suite N, Frederick, MD 21704
Based in Frederick, 12 mi away
61/100CR ScoreRanked #12 because of its Google rating and trade focus: 5.0★ from 906 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 906 Google reviews
- Hours
- Mon–Fri 8 AM–5 PM · Sat 9 AM–1 PM · Sun 9 AM–12 PM
- Address
- 8420 Gas House Pike DD, Frederick, MD 21701
Based in Frederick, 15 mi away
61/100CR ScoreRanked #13 because of its Google rating and trade focus: 4.9★ from 1,614 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 1,614 Google reviews
- Hours
- Mon–Sun 8 AM–5 PM
- Address
- 4650 Wedgewood Blvd #102, Frederick, MD 21703
#14 Warner Service
Based in Frederick, 13 mi away
61/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.8★ from 537 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 537 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 217 Monroe Ave, Frederick, MD 21701
Based in Gaithersburg, 15 mi away
61/100CR ScoreRanked #15 because of its Google rating and trade focus: 4.8★ from 666 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 666 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 18918 Premiere Ct, Gaithersburg, MD 20879
Based in Westminster, 16 mi away
61/100CR ScoreRanked #16 because of its Google rating and trade focus: 4.9★ from 580 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 580 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 835 Baltimore Blvd, Westminster, MD 21157
Based in Frederick, 13 mi away
60/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.8★ from 414 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 414 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3 King Ave, Frederick, MD 21701
Based in Westminster, 18 mi away
60/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 679 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 679 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 90 Aileron Ct #9, Westminster, MD 21157
Based in Frederick, 18 mi away
60/100CR ScoreRanked #19 because of its Google rating and trade focus: 4.9★ from 547 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 547 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5304C Kings Ct, Frederick, MD 21703
#20 Urbana HVAC
Based in Ballenger Creek, 13 mi away
60/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 182 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 182 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Clarksburg, 7 mi away
60/100CR ScoreRanked #21 because of its Google rating and trade focus: 5.0★ from 61 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 61 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Eldersburg, 16 mi away
60/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 699 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 699 Google reviews
- Hours
- Mon–Fri 7 AM–7 PM · Sat–Sun 8 AM–5 PM
#23 United Air Temp
Based in Frederick, 18 mi away
60/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.7★ from 928 Google reviews, listed on Google as “HVAC contractor”.
- 4.7★ from 928 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5305 Jefferson Pike Suite 5, Frederick, MD 21703
#24 Farnen & Dermer
Based in Owings Mills, 20 mi away
60/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.8★ from 931 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 931 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10500 Reisterstown Rd, Owings Mills, MD 21117
Based in Gaithersburg, 16 mi away
60/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.9★ from 298 Google reviews, listed on Google as “HVAC contractor”.
- 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
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 442 ranked HVAC contractors here; the rest are on their profiles.
Also serving Mount Airy
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) | 20 mi |
| A Quality HVAC | 5.0★ (2) | 14 mi |
| AM/PM Emergency Services a division of Robert E Clubb & Associates | 5.0★ (2) | In Mount Airy |
| AMS Air Conditioning & Heating | 4.9★ (116) | 20 mi |
| Apple Plumbing, Heating, & Air | 5.0★ (216) | 11 mi |
| ASC HVAC | 4.7★ (13) | 9 mi |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (90) | 19 mi |
| Bill Myers Inc | 4.5★ (2) | 23 mi |
| Brick Street Plumbing & HVAC | 4.2★ (364) | 14 mi |
| Brothers HVAC LLC | 4.9★ (76) | 20 mi |
| ClemAIR Heating & Cooling, LLC | 5.0★ (9) | 8 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 15 mi |
| garagedoorsrepairellicottcitymd | 5.0★ (2) | 20 mi |
| JC & JC HVAC | 4.7★ (503) | 21 mi |
| Long Mechanical Services LLC | 5.0★ (19) | 12 mi |
| Michael & Son Services | 4.7★ (419) | 24 mi |
| P W Scholl Plumbing & Heating Inc | 5.0★ (2) | 11 mi |
| Palmer Heating and Cooling | 5.0★ (2) | 19 mi |
| United Air Temp | 4.7★ (75) | 17 mi |
| Vito Services | 4.7★ (1,351) | 19 mi |
How much do HVAC contractors cost in Mount Airy?
National price ranges in USD, not adjusted for Mount Airy. 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 Mount Airy HVAC contractors
We scored 442 Mount Airy HVAC contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Mount Airy data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |
HVAC contractors in Mount Airy: frequently asked questions
Who is the best HVAC contractor in Mount Airy?
By CR Score, the highest-ranked HVAC contractor in Mount Airy, MD is GAC Services with a CR Score of 64/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. One Hour Air Conditioning & Heating® of Mount Airy (#2) and Presidential, Inc. (#3) follow. We ranked 442 HVAC contractors on ten factors, last updated October 22, 2026.
How many HVAC contractors are there in Mount Airy?
ContractorsRanked ranks 442 HVAC contractors serving Mount Airy, MD. 2 of them are based in Mount Airy; 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 Mount Airy are open 24/7?
115 ranked HVAC contractors in Mount Airy post 24/7 hours. The highest-ranked are GAC Services (#1), One Hour Air Conditioning & Heating® of Mount Airy (#2) and Presidential, Inc. (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Mount Airy work on weekends?
258 of 442 ranked HVAC contractors post Saturday hours and 183 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), One Hour Air Conditioning & Heating® of Mount Airy (#2) and Presidential, Inc. (#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 Mount Airy?
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 Mount Airy. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Mount Airy HVAC contractors have?
The median Google rating among 442 rated HVAC contractors in Mount Airy is 4.9★, with a median of 26 reviews. GAC Services has the most, 6,908 reviews, and ranks #1. 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 Mount Airy?
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 Mount Airy
- October 2026: CR Scores recalculated for 442 hvac contractors serving Mount Airy.
More HVAC contractors and Mount Airy pages
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- Solar installers in Mount Airy170 ranked
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- All contractors in Mount Airy