93/100CR 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 Colesville, MD (2026)
1,115 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Colesville: GAC Services, CR Score 93/100; 4.9★ from 6,908 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Len The Plumber Heating & Air, LLC, posts 24/7 hours; ranked #2 of 1,115.
- 12
Most-reviewed: Michael & Son Services, 15,537 Google reviews at 4.7★, the most of 1,115 ranked; ranked #12.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
1,115 Colesville HVAC contractors are ranked here by CR Score, from 8 published factors. 342 are open 24/7, 734 open Saturdays and 509 open Sundays, based on posted hours. The median Google rating is 4.9★ across 1,115 rated businesses.
Top 10 HVAC contractors in Colesville at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | GAC Services | 93 | 4.9★ (6,908) | Gaithersburg, 11 mi away | 24/7 | Overall |
| 2 | Len The Plumber Heating & Air, LLC | 92 | 4.6★ (8,136) | Silver Spring, 4 mi away | 24/7 | Emergencies |
| 3 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 91 | 4.7★ (5,985) | Rockville, 7 mi away | 24/7 | — |
| 4 | Presidential, Inc. | 90 | 4.9★ (1,701) | Gaithersburg, 11 mi away | 24/7 | — |
| 5 | NARFIX HEATING AND AIR CONDITIONING LLC | 90 | 5.0★ (293) | Silver Spring, 5 mi away | 24/7 | — |
| 6 | Michael Bonsby HVAC, Plumbing & Electrical | 90 | 4.8★ (2,083) | Gaithersburg, 11 mi away | 24/7 | — |
| 7 | Parker Pearce Service Experts | 90 | 4.8★ (1,700) | Gaithersburg, 11 mi away | 24/7 | — |
| 8 | United Air Temp | 90 | 4.8★ (1,306) | Greenbelt, 9 mi away | 24/7 | — |
| 9 | CroppMetcalfe | 89 | 4.8★ (7,638) | Fairfax, 19 mi away | 24/7 | — |
| 10 | Cyprus Air Heating, Cooling and Fireplaces | 89 | 4.7★ (1,402) | Rockville, 7 mi away | 24/7 | — |
The 1,115 best HVAC contractors in Colesville, 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 Silver Spring, 4 mi away
92/100CR ScoreRanked #2 because of its Google rating and availability: 4.6★ from 8,136 Google reviews, open 24/7.
- 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 Rockville, 7 mi away
91/100CR ScoreRanked #3 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, 11 mi away
90/100CR ScoreRanked #4 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 Silver Spring, 5 mi away
90/100CR ScoreRanked #5 because of its Google rating and availability: 5.0★ from 293 Google reviews, open 24/7.
- 5.0★ from 293 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9407 New Hampshire Ave, Silver Spring, MD 20903
Based in Gaithersburg, 11 mi away
90/100CR ScoreRanked #6 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 Gaithersburg, 11 mi away
90/100CR ScoreRanked #7 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 Greenbelt, 9 mi away
90/100CR ScoreRanked #8 because of its Google rating and availability: 4.8★ from 1,306 Google reviews, open 24/7.
- 4.8★ from 1,306 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7255 Hanover Pkwy Ste A, Greenbelt, MD 20770
Based in Fairfax, 19 mi away
89/100CR ScoreRanked #9 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 Rockville, 7 mi away
89/100CR ScoreRanked #10 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 Columbia, 11 mi away
89/100CR ScoreRanked #11 because of its Google rating and availability: 4.9★ from 658 Google reviews, open 24/7.
- 4.9★ from 658 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9375 Gerwig Ln J, Columbia, MD 21046
Based in Alexandria, 21 mi away
89/100CR ScoreRanked #12 because of its Google rating and availability: 4.7★ from 15,537 Google reviews, open 24/7.
- 4.7★ from 15,537 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5740 General Washington Dr, Alexandria, VA 22312
Based in Fairfax, 18 mi away
89/100CR ScoreRanked #13 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 Silver Spring, 5 mi away
89/100CR ScoreRanked #14 because of its Google rating and availability: 4.8★ from 299 Google reviews, open 24/7.
- 4.8★ from 299 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2412 Linden Ln, Silver Spring, MD 20910
Based in Silver Spring, 5 mi away
89/100CR ScoreRanked #15 because of its Google rating and availability: 4.8★ from 291 Google reviews, open 24/7.
- 4.8★ from 291 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2345 Distribution Cir, Silver Spring, MD 20910
Based in Alexandria, 19 mi away
88/100CR ScoreRanked #16 because of its Google rating and availability: 5.0★ from 959 Google reviews, open 24/7.
- 5.0★ from 959 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5800 Quantrell Ave #1510, Alexandria, VA 22312
Based in Aspen Hill, 5 mi away
88/100CR ScoreRanked #17 because of its Google rating and availability: 4.7★ from 419 Google reviews, open 24/7.
- 4.7★ from 419 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3511 University Blvd W, Kensington, MD 20895
Based in Silver Spring, 5 mi away
88/100CR ScoreRanked #18 because of its Google rating and availability: 4.9★ from 130 Google reviews, open 24/7.
- 4.9★ from 130 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1813 Mt Pisgah Ln, Silver Spring, MD 20903
#19 John C. Flood
Based in Alexandria, 21 mi away
88/100CR ScoreRanked #19 because of its Google rating and availability: 4.8★ from 4,976 Google reviews, open 24/7.
- 4.8★ from 4,976 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6430 General Green Way, Alexandria, VA 22312
Based in Gaithersburg, 11 mi away
88/100CR ScoreRanked #20 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
Based in Crofton, 18 mi away
88/100CR ScoreRanked #21 because of its Google rating and availability: 4.9★ from 1,156 Google reviews, open 24/7.
- 4.9★ from 1,156 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2142 Priest Bridge Court #6, Crofton, MD 21114
Based in Sterling, 22 mi away
88/100CR ScoreRanked #22 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 Hyattsville, 12 mi away
88/100CR ScoreRanked #23 because of its Google rating and trade focus: 4.8★ from 8,326 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 8,326 Google reviews
- Hours
- Mon–Sun 8 AM–6 PM
- Address
- 3400 Sharp St, Hyattsville, MD 20785
Based in Sterling, 23 mi away
88/100CR ScoreRanked #24 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 Baltimore, 22 mi away
88/100CR ScoreRanked #25 because of its Google rating and availability: 4.8★ from 4,514 Google reviews, open 24/7.
- 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
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 1,115 ranked HVAC contractors here; the rest are on their profiles.
Also serving Colesville
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-Gas Rapid Recovery - Baltimore | 5.0★ (2) | 10 mi |
| AVS Heating and Air Conditioning Bethesda - Appliance, Heating, AC Install, Repair Maintenance Service | 4.8★ (104) | 8 mi |
| Bill Myers Inc | 4.5★ (2) | 6 mi |
| Conrod's Plumbing Heating and A/C | 5.0★ (2) | 5 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 9 mi |
| DMV Mechanical | 3.0★ (2) | 5 mi |
| Energy Systems Inc | 3.0★ (2) | 2 mi |
| Heravo HVAC Repair Washington | 5.0★ (2) | 12 mi |
| JC & JC HVAC | 4.7★ (503) | 2 mi |
| JDL HVAC & Plumbing Services | 4.8★ (678) | 8 mi |
| Kensington Cooling & Heating | 5.0★ (2) | 5 mi |
| Meleney Equipment Inc | 5.0★ (2) | 11 mi |
| One Call Services | 5.0★ (2) | 11 mi |
| Owens & Johnsons Heating and Cooling | 3.0★ (2) | 3 mi |
| R And R Climate Control Inc | 5.0★ (2) | 6 mi |
| R D Springer Plumbing & Heating | 5.0★ (2) | 4 mi |
| Rockville Heating & Air Services | 5.0★ (2) | 10 mi |
| S.L. Johnson Plumbing & Heating | 3.0★ (2) | 8 mi |
| T & T Plumbing And Heating | 5.0★ (2) | 10 mi |
| Vito Services | 4.7★ (1,351) | 8 mi |
How much do HVAC contractors cost in Colesville?
National price ranges in USD, not adjusted for Colesville. 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 Colesville HVAC contractors
We scored 1,115 Colesville 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 Colesville 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 Colesville: frequently asked questions
Who is the best HVAC contractor in Colesville?
By CR Score, the highest-ranked HVAC contractor in Colesville, MD is GAC Services with a CR Score of 93/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. Len The Plumber Heating & Air, LLC (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3) follow. We ranked 1,115 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Colesville?
ContractorsRanked ranks 1,115 HVAC contractors serving Colesville, MD. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Colesville are open 24/7?
342 ranked HVAC contractors in Colesville post 24/7 hours. The highest-ranked are GAC Services (#1), Len The Plumber Heating & Air, LLC (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Colesville work on weekends?
734 of 1,115 ranked HVAC contractors post Saturday hours and 509 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), Len The Plumber Heating & Air, LLC (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & 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 Colesville?
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 Colesville. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Colesville HVAC contractors have?
The median Google rating among 1,115 rated HVAC contractors in Colesville is 4.9★, with a median of 23 reviews. Michael & Son Services has the most, 15,537 reviews, and ranks #12. 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 Colesville?
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 Colesville
- October 2026: CR Scores recalculated for 1,115 hvac contractors serving Colesville.
- October 2026: 11 duplicate listings merged.
More HVAC contractors and Colesville pages
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Other trades in Colesville
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- Landscapers in Colesville355 ranked
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- Kitchen remodelers in Colesville1159 ranked
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- Flooring contractors in Colesville731 ranked
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- Drywall contractors in Colesville22 ranked
- Concrete contractors in Colesville383 ranked
- Fence contractors in Colesville179 ranked
- Deck builders in Colesville501 ranked
- Siding contractors in Colesville701 ranked
- Window installers in Colesville701 ranked
- Gutter installers in Colesville386 ranked
- Insulation contractors in Colesville130 ranked
- Solar installers in Colesville190 ranked
- Garage door repair companies in Colesville155 ranked
- Foundation repair companies in Colesville223 ranked
- Tree services in Colesville386 ranked
- Masonry contractors in Colesville307 ranked
- Water damage restoration companies in Colesville903 ranked
- Home builders in Colesville843 ranked
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- All contractors in Colesville