92/100CR Score
Ranked #1 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
Best HVAC Contractors in Columbia, MD (2026)
905 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Columbia: Environmental Systems Associates, CR Score 92/100; 4.9★ from 658 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, posts 24/7 hours; ranked #2 of 905.
- 13
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 905 ranked; ranked #13.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
905 Columbia HVAC contractors are ranked here by CR Score, from 8 published factors. 261 are open 24/7, 546 open Saturdays and 396 open Sundays, based on posted hours. The median Google rating is 4.8★ across 905 rated businesses.
Top 10 HVAC contractors in Columbia at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Environmental Systems Associates | 92 | 4.9★ (658) | Columbia | 24/7 | Overall |
| 2 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 92 | 4.8★ (4,514) | Baltimore, 8 mi away | 24/7 | Emergencies |
| 3 | GAC Services | 90 | 4.9★ (6,908) | Gaithersburg, 20 mi away | 24/7 | — |
| 4 | Greenfox Cooling, Heating & Plumbing | 90 | 4.8★ (238) | Columbia | 24/7 | — |
| 5 | Complete Climate Services LLC | 89 | 5.0★ (786) | Baltimore, 14 mi away | 24/7 | — |
| 6 | Michael & Son Services | 89 | 4.7★ (8,039) | Baltimore, 17 mi away | 24/7 | — |
| 7 | Boothe's Heating, Air, Plumbing, Drains & Electrical | 89 | 4.9★ (1,461) | Dundalk, 16 mi away | 24/7 | — |
| 8 | Thomas D. Stern Air Experts Inc. | 89 | 5.0★ (699) | Eldersburg, 3 mi away | Sat · Sun · Evenings | — |
| 9 | Buric Heating and Air Conditioning | 89 | 5.0★ (389) | Columbia | Sat · Sun | — |
| 10 | Presidential, Inc. | 89 | 4.9★ (1,701) | Gaithersburg, 18 mi away | 24/7 | — |
The 905 best HVAC contractors in Columbia, 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 Baltimore, 8 mi away
92/100CR ScoreRanked #2 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
#3 GAC Services
Based in Gaithersburg, 20 mi away
90/100CR ScoreRanked #3 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
Based in Columbia
90/100CR ScoreRanked #4 because of its Google rating and availability: 4.8★ from 238 Google reviews, open 24/7.
- 4.8★ from 238 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9160 Rumsey Rd Suite B2, Columbia, MD 21045
Based in Baltimore, 14 mi away
89/100CR ScoreRanked #5 because of its Google rating and availability: 5.0★ from 786 Google reviews, open 24/7.
- 5.0★ from 786 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 204 S Chapel St, Baltimore, MD 21231
Based in Baltimore, 17 mi away
89/100CR ScoreRanked #6 because of its Google rating and availability: 4.7★ from 8,039 Google reviews, open 24/7.
- 4.7★ from 8,039 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6420 Erdman Ave, Baltimore, MD 21205
Based in Dundalk, 16 mi away
89/100CR ScoreRanked #7 because of its Google rating and availability: 4.9★ from 1,461 Google reviews, open 24/7.
- 4.9★ from 1,461 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7600 Energy Pkwy Suite 114, Curtis Bay Industrial Area, MD 21226
Based in Eldersburg, 3 mi away
89/100CR ScoreRanked #8 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
Based in Columbia
89/100CR ScoreRanked #9 because of its Google rating and trade focus: 5.0★ from 389 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 389 Google reviews
- Hours
- Mon–Sun 8 AM–5 PM
- Address
- 6660 Dobbin Rd Unit E, Columbia, MD 21045
Based in Gaithersburg, 18 mi away
89/100CR ScoreRanked #10 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 Arbutus, 8 mi away
89/100CR ScoreRanked #11 because of its Google rating and availability: 4.9★ from 275 Google reviews, open 24/7.
- 4.9★ from 275 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5515 Selma Ave Suite 2B, Halethorpe, MD 21227
Based in Arbutus, 11 mi away
88/100CR ScoreRanked #12 because of its Google rating and availability: 4.9★ from 419 Google reviews, open 24/7.
- 4.9★ from 419 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Arbutus, 9 mi away
88/100CR ScoreRanked #13 because of its Google rating and review volume: 4.7★ from 15,911 Google reviews, the most Google reviews on this list (15,911).
- 4.7★ from 15,911 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3610 Commerce Dr Suite 808, Halethorpe, MD 21227
Based in Columbia
88/100CR ScoreRanked #14 because of its Google rating and availability: 5.0★ from 49 Google reviews, open 24/7.
- 5.0★ from 49 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6304 Woodside Ct Suite 110 Office 2, Columbia, MD 21046
Based in Rockville, 19 mi away
88/100CR ScoreRanked #15 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
#16 Farnen & Dermer
Based in Owings Mills, 13 mi away
88/100CR ScoreRanked #16 because of its Google rating and availability: 4.8★ from 931 Google reviews, open 24/7.
- 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 Columbia
88/100CR ScoreRanked #17 because of its Google rating and trade focus: 4.9★ from 485 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 485 Google reviews
- Hours
- Mon–Fri 8 AM–8 PM · Sat–Sun 9 AM–5 PM
- Address
- 8300 Guilford Rd Suite D, Columbia, MD 21046
Based in Gaithersburg, 18 mi away
88/100CR ScoreRanked #18 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 Silver Spring, 18 mi away
88/100CR ScoreRanked #19 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 Hanover, 7 mi away
88/100CR ScoreRanked #20 because of its Google rating and trade focus: 5.0★ from 729 Google reviews, listed on Google as “HVAC contractor”.
- 5.0★ from 729 Google reviews
- Hours
- Mon–Sun 7:30 AM–5 PM
- Address
- 7380 Coca Cola Dr Suite 121, Hanover, MD 21076
Based in Arbutus, 10 mi away
88/100CR ScoreRanked #21 because of its Google rating and availability: 4.9★ from 217 Google reviews, open 24/7.
- 4.9★ from 217 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5195 Raynor Ave, Linthicum Heights, MD 21090
Based in Crofton, 19 mi away
88/100CR ScoreRanked #22 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 Gaithersburg, 18 mi away
88/100CR ScoreRanked #23 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 Hanover, 10 mi away
88/100CR ScoreRanked #24 because of its Google rating and trade focus: 4.9★ from 2,167 Google reviews, listed on Google as “HVAC contractor”.
- 4.9★ from 2,167 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2600 Cabover Dr unit a, Hanover, MD 21076
Based in Laurel, 8 mi away
88/100CR ScoreRanked #25 because of its Google rating and availability: 4.4★ from 3,510 Google reviews, open 24/7.
- 4.4★ from 3,510 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9010 Maier Rd # 105, Laurel, MD 20723
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 905 ranked HVAC contractors here; the rest are on their profiles.
Also serving Columbia
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 |
|---|---|---|
| Air Green HVAC | In Columbia | |
| Around the Clock Plumbing & Heating | 5.0★ (2) | 8 mi |
| aundreysheating&cooling services | In Columbia | |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (90) | In Columbia |
| Columbia's | In Columbia | |
| Cool Air Products | 5.0★ (2) | In Columbia |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 8 mi |
| Delta HVAC & Refrigeration Services | In Columbia | |
| garagedoorsrepairellicottcitymd | 5.0★ (2) | 1 mi |
| JC & JC HVAC | 4.7★ (503) | 12 mi |
| Joe c heating & cooling | In Columbia | |
| Mechanical Systems, Inc. | 5.0★ (1) | In Columbia |
| Mechanical Systems, Inc. | 4.0★ (1) | In Columbia |
| Meleney Equipment Inc | 5.0★ (2) | 7 mi |
| Morin Hydronics | In Columbia | |
| One Hour Air Conditioning & Heating® of Mount Airy | 4.7★ (852) | 18 mi |
| Palmer Heating and Cooling | 5.0★ (2) | In Columbia |
| ROCKY LLC | 4.6★ (253) | 10 mi |
| Rodco Services | 3.9★ (11) | In Columbia |
| Vito Services | 4.7★ (1,351) | 19 mi |
How much do HVAC contractors cost in Columbia?
National price ranges in USD, not adjusted for Columbia. 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 Columbia HVAC contractors
We scored 905 Columbia 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 Columbia 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 Columbia: frequently asked questions
Who is the best HVAC contractor in Columbia?
By CR Score, the highest-ranked HVAC contractor in Columbia, MD is Environmental Systems Associates with a CR Score of 92/100. It has 4.9★ from 658 Google reviews. It is open 24/7. Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical (#2) and GAC Services (#3) follow. We ranked 905 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Columbia?
ContractorsRanked ranks 905 HVAC contractors serving Columbia, MD. 5 of them are based in Columbia; 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 Columbia are open 24/7?
261 ranked HVAC contractors in Columbia post 24/7 hours. The highest-ranked are Environmental Systems Associates (#1), Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical (#2) and GAC Services (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Columbia work on weekends?
546 of 905 ranked HVAC contractors post Saturday hours and 396 post Sunday hours. The highest-ranked open Saturdays are Environmental Systems Associates (#1), Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical (#2) and GAC Services (#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 Columbia?
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 Columbia. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Columbia HVAC contractors have?
The median Google rating among 905 rated HVAC contractors in Columbia is 4.8★, with a median of 23 reviews. Len The Plumber Heating & Air, LLC has the most, 15,911 reviews, and ranks #13. 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 Columbia?
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 Columbia
- October 2026: CR Scores recalculated for 905 hvac contractors serving Columbia.
- October 2026: 3 duplicate listings merged.
More HVAC contractors and Columbia pages
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