91/100CR 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 Riverside, MD (2026)
950 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Riverside: Environmental Systems Associates, CR Score 91/100; 4.9★ from 658 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): GAC Services, posts 24/7 hours; ranked #2 of 950.
- 29
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 950 ranked; ranked #29.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
950 Riverside HVAC contractors are ranked here by CR Score, from 8 published factors. 279 are open 24/7, 592 open Saturdays and 425 open Sundays, based on posted hours. The median Google rating is 4.8★ across 950 rated businesses.
Top 10 HVAC contractors in Riverside at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Environmental Systems Associates | 91 | 4.9★ (658) | Columbia, 3 mi away | 24/7 | Overall |
| 2 | GAC Services | 91 | 4.9★ (6,908) | Gaithersburg, 16 mi away | 24/7 | Emergencies |
| 3 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 90 | 4.8★ (4,514) | Baltimore, 13 mi away | 24/7 | — |
| 4 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 89 | 4.7★ (5,985) | Rockville, 15 mi away | 24/7 | — |
| 5 | Presidential, Inc. | 89 | 4.9★ (1,701) | Gaithersburg, 15 mi away | 24/7 | — |
| 6 | Len The Plumber Heating & Air, LLC | 89 | 4.6★ (8,136) | Silver Spring, 13 mi away | 24/7 | — |
| 7 | Michael Bonsby HVAC, Plumbing & Electrical | 89 | 4.8★ (2,083) | Gaithersburg, 15 mi away | 24/7 | — |
| 8 | United Air Temp | 89 | 4.8★ (1,306) | Greenbelt, 13 mi away | 24/7 | — |
| 9 | ARS / Rescue Rooter | 88 | 4.4★ (3,510) | Laurel, 5 mi away | 24/7 | — |
| 10 | Grove Heating & Cooling | 88 | 4.9★ (1,156) | Crofton, 16 mi away | 24/7 | — |
The 950 best HVAC contractors in Riverside, 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.
#2 GAC Services
Based in Gaithersburg, 16 mi away
91/100CR ScoreRanked #2 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 Baltimore, 13 mi away
90/100CR ScoreRanked #3 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 Rockville, 15 mi away
89/100CR 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, 15 mi away
89/100CR ScoreRanked #5 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, 13 mi away
89/100CR 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, 15 mi away
89/100CR ScoreRanked #7 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 Greenbelt, 13 mi away
89/100CR 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 Laurel, 5 mi away
88/100CR ScoreRanked #9 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
Based in Crofton, 16 mi away
88/100CR ScoreRanked #10 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, 15 mi away
88/100CR ScoreRanked #11 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 Dundalk, 18 mi away
88/100CR ScoreRanked #12 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 Baltimore, 18 mi away
88/100CR ScoreRanked #13 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 Silver Spring, 12 mi away
88/100CR ScoreRanked #14 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 Columbia, 5 mi away
88/100CR ScoreRanked #15 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, 21 mi away
88/100CR ScoreRanked #16 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 Eldersburg, 6 mi away
88/100CR ScoreRanked #17 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, 1 mi away
88/100CR ScoreRanked #18 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 Annapolis, 23 mi away
88/100CR ScoreRanked #19 because of its Google rating and availability: 4.9★ from 2,904 Google reviews, open 24/7.
- 4.9★ from 2,904 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1991 Moreland Pkwy, Annapolis, MD 21401
Based in Columbia, 3 mi away
88/100CR ScoreRanked #20 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
#21 United Air Temp
Based in Jessup, 6 mi away
88/100CR ScoreRanked #21 because of its Google rating and availability: 4.8★ from 171 Google reviews, open 24/7.
- 4.8★ from 171 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8017 Dorsey Run Rd Suite G, Jessup, MD 20794
Based in Columbia, 2 mi away
88/100CR ScoreRanked #22 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 Laurel, 4 mi away
88/100CR ScoreRanked #23 because of its Google rating and availability: 4.8★ from 114 Google reviews, open 24/7.
- 4.8★ from 114 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10101 Wilnor Way, Laurel, MD 20723
Based in Arbutus, 12 mi away
88/100CR ScoreRanked #24 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 Dundalk, 12 mi away
87/100CR ScoreRanked #25 because of its Google rating and availability: 5.0★ from 179 Google reviews, open 24/7.
- 5.0★ from 179 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
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 950 ranked HVAC contractors here; the rest are on their profiles.
Also serving Riverside
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) | 7 mi |
| Around the Clock Plumbing & Heating | 5.0★ (2) | 11 mi |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (90) | 4 mi |
| Bill Myers Inc | 4.5★ (2) | 5 mi |
| Capitol Boiler Works | 1.0★ (2) | 13 mi |
| Conrod's Plumbing Heating and A/C | 5.0★ (2) | 14 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 5 mi |
| DMV Mechanical | 3.0★ (2) | 14 mi |
| Energy Systems Inc | 3.0★ (2) | 10 mi |
| garagedoorsrepairellicottcitymd | 5.0★ (2) | 6 mi |
| JC & JC HVAC | 4.7★ (503) | 7 mi |
| Meleney Equipment Inc | 5.0★ (2) | 5 mi |
| oncall-garageservice | 5.0★ (2) | 14 mi |
| One Call Services | 5.0★ (2) | 10 mi |
| Palmer Heating and Cooling | 5.0★ (2) | 4 mi |
| R And R Climate Control Inc | 5.0★ (2) | 13 mi |
| R D Springer Plumbing & Heating | 5.0★ (2) | 11 mi |
| ROCKY LLC | 4.6★ (253) | 9 mi |
| Shielded Edge Property Solutions | 5.0★ (2) | 12 mi |
| Vito Services | 4.7★ (1,351) | 15 mi |
How much do HVAC contractors cost in Riverside?
National price ranges in USD, not adjusted for Riverside. 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 Riverside HVAC contractors
We scored 950 Riverside 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 Riverside 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 Riverside: frequently asked questions
Who is the best HVAC contractor in Riverside?
By CR Score, the highest-ranked HVAC contractor in Riverside, MD is Environmental Systems Associates with a CR Score of 91/100. It has 4.9★ from 658 Google reviews. It is open 24/7. GAC Services (#2) and Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical (#3) follow. We ranked 950 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Riverside?
ContractorsRanked ranks 950 HVAC contractors serving Riverside, MD. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Riverside are open 24/7?
279 ranked HVAC contractors in Riverside post 24/7 hours. The highest-ranked are Environmental Systems Associates (#1), GAC Services (#2) and Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Riverside work on weekends?
592 of 950 ranked HVAC contractors post Saturday hours and 425 post Sunday hours. The highest-ranked open Saturdays are Environmental Systems Associates (#1), GAC Services (#2) and Horizon Services - Air Conditioning, Heating, 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 Riverside?
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 Riverside. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Riverside HVAC contractors have?
The median Google rating among 950 rated HVAC contractors in Riverside is 4.8★, with a median of 23 reviews. Len The Plumber Heating & Air, LLC has the most, 15,911 reviews, and ranks #29. 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 Riverside?
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 Riverside
- October 2026: CR Scores recalculated for 950 hvac contractors serving Riverside.
- October 2026: 5 duplicate listings merged.
More HVAC contractors and Riverside pages
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Other trades in Riverside
- Roofers in Riverside1489 ranked
- Plumbers in Riverside753 ranked
- Electricians in Riverside604 ranked
- General contractors in Riverside1450 ranked
- Painters in Riverside280 ranked
- Landscapers in Riverside285 ranked
- Handymen in Riverside152 ranked
- Kitchen remodelers in Riverside907 ranked
- Bathroom remodelers in Riverside887 ranked
- Flooring contractors in Riverside563 ranked
- Tile installers in Riverside56 ranked
- Drywall contractors in Riverside15 ranked
- Concrete contractors in Riverside343 ranked
- Fence contractors in Riverside155 ranked
- Deck builders in Riverside396 ranked
- Siding contractors in Riverside671 ranked
- Window installers in Riverside670 ranked
- Gutter installers in Riverside305 ranked
- Insulation contractors in Riverside107 ranked
- Solar installers in Riverside185 ranked
- Garage door repair companies in Riverside147 ranked
- Foundation repair companies in Riverside211 ranked
- Tree services in Riverside300 ranked
- Masonry contractors in Riverside262 ranked
- Water damage restoration companies in Riverside872 ranked
- Home builders in Riverside809 ranked
- Demolition contractors in Riverside131 ranked
- All contractors in Riverside