649 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Baltimore: Michael & Son Services, CR Score 66/100; 4.7★ from 8,039 Google reviews; open 24/7.
Best for emergencies (open 24/7): Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, posts 24/7 hours; ranked #2 of 649.
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 649 ranked; ranked #8.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
649 Baltimore HVAC contractors are ranked here by CR Score, from ten published factors. 197 are open 24/7, 381 open Saturdays and 286 open Sundays, based on posted hours. The median Google rating is 4.8★ across 649 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Michael & Son Services | 66 | 4.7★ (8,039) | Baltimore | 24/7 | Overall |
| 2 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 66 | 4.8★ (4,514) | Baltimore | 24/7 | Emergencies |
| 3 | Complete Climate Services LLC | 65 | 5.0★ (786) | Baltimore | 24/7 | — |
| 4 | Boothe's Heating, Air, Plumbing, Drains & Electrical | 63 | 4.9★ (1,461) | Dundalk, 9 mi away | 24/7 | — |
| 5 | Alpha Heating & Air Conditioning, LLC | 63 | 4.9★ (419) | Arbutus, 3 mi away | 24/7 | — |
| 6 | Abbott Brothers Plumbing & Heating of Maryland | 63 | 4.8★ (354) | Baltimore | 24/7 | — |
| 7 | At Your Service Heating and Cooling LLC | 63 | 4.6★ (811) | Baltimore | 24/7 | — |
| 8 | Len The Plumber Heating & Air, LLC | 62 | 4.7★ (15,911) | Arbutus, 4 mi away | 24/7 | Most reviews |
| 9 | One Hour Air Conditioning & Heating® of Baltimore | 62 | 4.8★ (219) | Baltimore | 24/7 | — |
| 10 | Amazing Plumbing, Heating & Air | 62 | 4.8★ (2,104) | Baltimore | Sat | — |
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.
Ranked #1 because of its Google rating and trade focus: 4.7★ from 8,039 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #2 because of its Google rating and trade focus: 4.8★ from 4,514 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #3 because of its Google rating and trade focus: 5.0★ from 786 Google reviews, listed on Google as “HVAC contractor”.
Based in Dundalk, 9 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 1,461 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 3 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 419 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #6 because of its Google rating and trade focus: 4.8★ from 354 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #7 because of its Google rating and trade focus: 4.6★ from 811 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 4 mi away
Ranked #8 because of its Google rating and review volume: 4.7★ from 15,911 Google reviews, the most in Baltimore.
Based in Baltimore
Ranked #9 because of its Google rating and trade focus: 4.8★ from 219 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #10 because of its Google rating and trade focus: 4.8★ from 2,104 Google reviews, listed on Google as “HVAC contractor”.
Based in Kew Gardens Hills, 2 mi away
Ranked #11 because of its Google rating and trade focus: 4.9★ from 177 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Hanover, 10 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 2,167 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 5 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 275 Google reviews, listed on Google as “HVAC contractor”.
Based in Essex, 7 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 369 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 5 mi away
Ranked #15 because of its Google rating and trade focus: 4.7★ from 472 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #16 because of its Google rating and trade focus: 4.8★ from 121 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 5 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 217 Google reviews, listed on Google as “HVAC contractor”.
Based in Essex, 8 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 195 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore
Ranked #19 because of its Google rating and trade focus: 4.5★ from 309 Google reviews, listed on Google as “HVAC contractor”.
Based in Essex, 8 mi away
Ranked #20 because of its Google rating and trade focus: 4.8★ from 408 Google reviews, listed on Google as “HVAC contractor”.
Based in Hanover, 10 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 729 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 1 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 832 Google reviews, listed on Google as “HVAC contractor”.
Based in Owings Mills, 13 mi away
Ranked #23 because of its Google rating and trade focus: 4.8★ from 931 Google reviews, listed on Google as “HVAC contractor”.
Based in Dundalk, 8 mi away
Ranked #24 because of its Google rating and trade focus: 4.7★ from 539 Google reviews, listed on Google as “HVAC contractor”.
Based in Annapolis, 22 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 2,904 Google reviews, listed on Google as “HVAC contractor”.
#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 649 ranked HVAC contractors here; the rest are on their profiles.
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 - CMM Dryer Vent Cleaning Services Co, MA | 4.8★ (11) | In Baltimore |
| A R Marani Inc | 4.0★ (4) | In Baltimore |
| AAA Air Conditioning and Refrigeration | 4.6★ (23) | In Baltimore |
| American Plumbing & Heating Co | 2.0★ (1) | In Baltimore |
| Bay Area Mechanical Services Inc. | 4.5★ (37) | In Baltimore |
| Blue Dot Services | 4.5★ (7,297) | 24 mi |
| Carver Heating & Cooling | 5.0★ (46) | 7 mi |
| Coldspring Co Inc | 1.0★ (1) | In Baltimore |
| Commercial CAD | 5.0★ (2) | In Baltimore |
| D D Air Conditioning & Heating | 1.0★ (1) | In Baltimore |
| Deca Corporation | 5.0★ (1) | In Baltimore |
| Free Da Block Drain Cleaning Services, LLC, | 5.0★ (20) | In Baltimore |
| Green Contracting Co Inc | 4.7★ (7) | In Baltimore |
| Horton Mechanical Contractors, Inc. | 5.0★ (4) | In Baltimore |
| Hydro Clean | 4.8★ (1,293) | In Baltimore |
| Martin Plumbing & Heating | 5.0★ (1) | In Baltimore |
| One Hour Air Conditioning & Heating® of Annapolis | 4.8★ (367) | 15 mi |
| Power And Flow Contracting | 5.0★ (68) | In Baltimore |
| Quartner’s | 4.6★ (22) | In Baltimore |
| SERVPRO of Catonsville | 4.4★ (90) | In Baltimore |
National price ranges in USD, not adjusted for Baltimore. 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 |
In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors licenses Heating, ventilation, air conditioning and refrigeration work.
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
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.
We scored 649 Baltimore 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 Baltimore 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 |