94/100CR 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 Olney, MD (2026)
1,013 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Olney: GAC Services, CR Score 94/100; 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 1,013.
- 41
Most-reviewed: Michael & Son Services, 8,326 Google reviews at 4.8★, the most of 1,013 ranked; ranked #41.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
1,013 Olney HVAC contractors are ranked here by CR Score, from 8 published factors. 303 are open 24/7, 664 open Saturdays and 474 open Sundays, based on posted hours. The median Google rating is 4.8★ across 1,013 rated businesses.
Top 10 HVAC contractors in Olney at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | GAC Services | 94 | 4.9★ (6,908) | Gaithersburg, 6 mi away | 24/7 | Overall |
| 2 | Presidential, Inc. | 92 | 4.9★ (1,701) | Gaithersburg, 5 mi away | 24/7 | Emergencies |
| 3 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 92 | 4.7★ (5,985) | Rockville, 6 mi away | 24/7 | — |
| 4 | Michael Bonsby HVAC, Plumbing & Electrical | 91 | 4.8★ (2,083) | Gaithersburg, 5 mi away | 24/7 | — |
| 5 | Parker Pearce Service Experts | 91 | 4.8★ (1,700) | Gaithersburg, 5 mi away | 24/7 | — |
| 6 | Len The Plumber Heating & Air, LLC | 90 | 4.6★ (8,136) | Silver Spring, 10 mi away | 24/7 | — |
| 7 | Cool Breeze Plumbing, Heating & A/C | 90 | 4.8★ (666) | Gaithersburg, 6 mi away | 24/7 | — |
| 8 | Cyprus Air Heating, Cooling and Fireplaces | 90 | 4.7★ (1,402) | Rockville, 7 mi away | 24/7 | — |
| 9 | Metro Services HVAC | 89 | 4.9★ (298) | Gaithersburg, 7 mi away | 24/7 | — |
| 10 | CroppMetcalfe | 89 | 4.8★ (7,638) | Fairfax, 21 mi away | 24/7 | — |
The 1,013 best HVAC contractors in Olney, 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, 5 mi away
92/100CR 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 Rockville, 6 mi away
92/100CR 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, 5 mi away
91/100CR ScoreRanked #4 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, 5 mi away
91/100CR 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 Silver Spring, 10 mi away
90/100CR ScoreRanked #6 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 Gaithersburg, 6 mi away
90/100CR ScoreRanked #7 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 Rockville, 7 mi away
90/100CR ScoreRanked #8 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 Gaithersburg, 7 mi away
89/100CR ScoreRanked #9 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
#10 CroppMetcalfe
Based in Fairfax, 21 mi away
89/100CR ScoreRanked #10 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 Columbia, 12 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 Silver Spring, 11 mi away
89/100CR ScoreRanked #12 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 Sterling, 21 mi away
89/100CR ScoreRanked #13 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 Baltimore, 21 mi away
88/100CR ScoreRanked #14 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
Based in Sterling, 22 mi away
88/100CR ScoreRanked #15 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 Rockville, 5 mi away
88/100CR ScoreRanked #16 because of its Google rating and availability: 4.9★ from 116 Google reviews, open 24/7.
- 4.9★ from 116 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4811 Rim Rock Rd, Rockville, MD 20853
#17 United Air Temp
Based in Greenbelt, 15 mi away
88/100CR ScoreRanked #17 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 Sterling, 23 mi away
88/100CR ScoreRanked #18 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 Fairfax, 21 mi away
88/100CR ScoreRanked #19 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
#20 Making Air Right
Based in Clarksburg, 13 mi away
88/100CR ScoreRanked #20 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 Gaithersburg, 6 mi away
88/100CR ScoreRanked #21 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
Based in Sterling, 24 mi away
88/100CR ScoreRanked #22 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 Aspen Hill, 8 mi away
87/100CR ScoreRanked #23 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 Sterling, 21 mi away
87/100CR ScoreRanked #24 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 Silver Spring, 10 mi away
87/100CR ScoreRanked #25 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
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 1,013 ranked HVAC contractors here; the rest are on their profiles.
Also serving Olney
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) | 10 mi |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (2,167) | 21 mi |
| Bill Myers Inc | 4.5★ (2) | 10 mi |
| CMH Inc | In Olney | |
| Conrod's Plumbing Heating and A/C | 5.0★ (2) | 11 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 6 mi |
| DMV Mechanical | 3.0★ (2) | 11 mi |
| Energy Systems Inc | 3.0★ (2) | 8 mi |
| Home Services at The Home Depot | 3.5★ (2) | 10 mi |
| JC & JC HVAC | 4.7★ (503) | 6 mi |
| JDL HVAC & Plumbing Services | 4.8★ (678) | 12 mi |
| KCK, LLC | 4.0★ (44) | In Olney |
| Kensington Cooling & Heating | 5.0★ (2) | 9 mi |
| Owens & Johnsons Heating and Cooling | 3.0★ (2) | 4 mi |
| P W Scholl Plumbing & Heating Inc | 5.0★ (2) | 11 mi |
| R D Springer Plumbing & Heating | 5.0★ (2) | 11 mi |
| Rockville Heating & Air Services | 5.0★ (2) | 7 mi |
| S.L. Johnson Plumbing & Heating | 3.0★ (2) | 6 mi |
| Solar Power and Heating | In Olney | |
| Vito Services | 4.7★ (1,351) | 6 mi |
How much do HVAC contractors cost in Olney?
National price ranges in USD, not adjusted for Olney. 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 Olney HVAC contractors
We scored 1,013 Olney 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 Olney 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 Olney: frequently asked questions
Who is the best HVAC contractor in Olney?
By CR Score, the highest-ranked HVAC contractor in Olney, MD is GAC Services with a CR Score of 94/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. Presidential, Inc. (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3) follow. We ranked 1,013 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Olney?
ContractorsRanked ranks 1,013 HVAC contractors serving Olney, MD. 1 of them is based in Olney; 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 Olney are open 24/7?
303 ranked HVAC contractors in Olney post 24/7 hours. The highest-ranked are GAC Services (#1), Presidential, Inc. (#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 Olney work on weekends?
664 of 1,013 ranked HVAC contractors post Saturday hours and 474 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), Presidential, Inc. (#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 Olney?
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 Olney. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Olney HVAC contractors have?
The median Google rating among 1,013 rated HVAC contractors in Olney is 4.8★, with a median of 22 reviews. Michael & Son Services has the most, 8,326 reviews, and ranks #41. 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 Olney?
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 Olney
- October 2026: CR Scores recalculated for 1,013 hvac contractors serving Olney.
- October 2026: 1 duplicate listing merged.
More HVAC contractors and Olney pages
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Other trades in Olney
- Roofers in Olney1591 ranked
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- Electricians in Olney674 ranked
- General contractors in Olney1462 ranked
- Painters in Olney321 ranked
- Landscapers in Olney346 ranked
- Handymen in Olney206 ranked
- Kitchen remodelers in Olney1066 ranked
- Bathroom remodelers in Olney1057 ranked
- Flooring contractors in Olney799 ranked
- Tile installers in Olney86 ranked
- Drywall contractors in Olney14 ranked
- Concrete contractors in Olney343 ranked
- Fence contractors in Olney179 ranked
- Deck builders in Olney448 ranked
- Siding contractors in Olney693 ranked
- Window installers in Olney756 ranked
- Gutter installers in Olney317 ranked
- Insulation contractors in Olney149 ranked
- Solar installers in Olney204 ranked
- Garage door repair companies in Olney163 ranked
- Foundation repair companies in Olney223 ranked
- Tree services in Olney313 ranked
- Masonry contractors in Olney306 ranked
- Water damage restoration companies in Olney919 ranked
- Home builders in Olney828 ranked
- Demolition contractors in Olney114 ranked
- All contractors in Olney