836 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Hanover: Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, CR Score 91/100; 4.8★ from 4,514 Google reviews; open 24/7.
Best for emergencies (open 24/7): Boothe's Heating, Air, Plumbing, Drains & Electrical, posts 24/7 hours; ranked #2 of 836.
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 836 ranked; ranked #9.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
836 Hanover HVAC contractors are ranked here by CR Score, from 8 published factors. 244 are open 24/7, 502 open Saturdays and 367 open Sundays, based on posted hours. The median Google rating is 4.8★ across 836 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 91 | 4.8★ (4,514) | Baltimore, 10 mi away | 24/7 | Overall |
| 2 | Boothe's Heating, Air, Plumbing, Drains & Electrical | 91 | 4.9★ (1,461) | Dundalk, 9 mi away | 24/7 | Emergencies |
| 3 | Complete Climate Services LLC | 90 | 5.0★ (786) | Baltimore, 10 mi away | 24/7 | — |
| 4 | Michael & Son Services | 90 | 4.7★ (8,039) | Baltimore, 13 mi away | 24/7 | — |
| 5 | Beltway Air Conditioning, Heating & Plumbing | 90 | 4.9★ (2,167) | Hanover | 24/7 | — |
| 6 | Environmental Systems Associates | 90 | 4.9★ (658) | Columbia, 6 mi away | 24/7 | — |
| 7 | Clarksville Heating & Air, LLC | 90 | 5.0★ (729) | Hanover | Sat · Sun | — |
| 8 | Sila Heating, Air Conditioning & Plumbing | 90 | 4.9★ (275) | Arbutus, 4 mi away | 24/7 | — |
| 9 | Len The Plumber Heating & Air, LLC | 89 | 4.7★ (15,911) | Arbutus, 5 mi away | 24/7 | Most reviews |
| 10 | Staton Heating, Cooling & Plumbing | 89 | 4.9★ (2,904) | Annapolis, 18 mi away | 24/7 | — |
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.
Ranked #1 in Hanover
Based in Baltimore, 10 mi away
Ranked #1 because of its Google rating and availability: 4.8★ from 4,514 Google reviews, open 24/7.
Based in Dundalk, 9 mi away
Ranked #2 because of its Google rating and availability: 4.9★ from 1,461 Google reviews, open 24/7.
Based in Baltimore, 10 mi away
Ranked #3 because of its Google rating and availability: 5.0★ from 786 Google reviews, open 24/7.
Based in Baltimore, 13 mi away
Ranked #4 because of its Google rating and availability: 4.7★ from 8,039 Google reviews, open 24/7.
Based in Hanover
Ranked #5 because of its Google rating and trade focus: 4.9★ from 2,167 Google reviews, listed on Google as “HVAC contractor”.
Based in Columbia, 6 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 658 Google reviews, open 24/7.
Based in Hanover
Ranked #7 because of its Google rating and trade focus: 5.0★ from 729 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 4 mi away
Ranked #8 because of its Google rating and availability: 4.9★ from 275 Google reviews, open 24/7.
Based in Arbutus, 5 mi away
Ranked #9 because of its Google rating and review volume: 4.7★ from 15,911 Google reviews, the most Google reviews on this list (15,911).
Based in Annapolis, 18 mi away
Ranked #10 because of its Google rating and availability: 4.9★ from 2,904 Google reviews, open 24/7.
Based in Arbutus, 4 mi away
Ranked #11 because of its Google rating and availability: 4.9★ from 217 Google reviews, open 24/7.
Based in Severn, 4 mi away
Ranked #12 because of its Google rating and availability: 4.8★ from 336 Google reviews, open 24/7.
Based in Crofton, 14 mi away
Ranked #13 because of its Google rating and availability: 4.9★ from 1,156 Google reviews, open 24/7.
Based in Arbutus, 9 mi away
Ranked #14 because of its Google rating and availability: 4.9★ from 419 Google reviews, open 24/7.
Based in Gaithersburg, 25 mi away
Ranked #15 because of its Google rating and availability: 4.9★ from 6,908 Google reviews, open 24/7.
Based in Arbutus, 4 mi away
Ranked #16 because of its Google rating and availability: 4.7★ from 472 Google reviews, open 24/7.
Based in Arbutus, 4 mi away
Ranked #17 because of its Google rating and availability: 4.9★ from 142 Google reviews, open 24/7.
Based in Arbutus, 3 mi away
Ranked #18 because of its Google rating and availability: 4.9★ from 98 Google reviews, open 24/7.
Based in Dundalk, 9 mi away
Ranked #19 because of its Google rating and availability: 5.0★ from 179 Google reviews, open 24/7.
Based in Glen Burnie, 4 mi away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 998 Google reviews, listed on Google as “HVAC contractor”.
Based in Columbia, 6 mi away
Ranked #21 because of its Google rating and availability: 4.8★ from 238 Google reviews, open 24/7.
Based in Jessup, 4 mi away
Ranked #22 because of its Google rating and availability: 4.8★ from 171 Google reviews, open 24/7.
Based in Laurel, 7 mi away
Ranked #23 because of its Google rating and availability: 4.4★ from 3,510 Google reviews, open 24/7.
Based in Annapolis, 19 mi away
Ranked #24 because of its Google rating and availability: 4.9★ from 1,127 Google reviews, open 24/7.
Based in Greenbelt, 16 mi away
Ranked #25 because of its Google rating and availability: 4.8★ from 1,306 Google reviews, open 24/7.
#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 836 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-Gas Rapid Recovery - Baltimore | 5.0★ (2) | 9 mi |
| All About Everything HVAC & Maintenance | 3.0★ (2) | 12 mi |
| Around the Clock Plumbing & Heating | 5.0★ (2) | 2 mi |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (90) | 7 mi |
| Bill Myers Inc | 4.5★ (2) | 11 mi |
| Capitol Boiler Works | 1.0★ (2) | 5 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 14 mi |
| DJE Plumbing and Heating | 5.0★ (2) | 11 mi |
| garagedoorsrepairellicottcitymd | 5.0★ (2) | 6 mi |
| JJ HEATING & COOLING COMPANY | 4.8★ (110) | 9 mi |
| JV heating and air services | 4.8★ (114) | 9 mi |
| Meleney Equipment Inc | 5.0★ (2) | 6 mi |
| oncall-garageservice | 5.0★ (2) | 6 mi |
| One Call Services | 5.0★ (2) | 12 mi |
| Palmer Heating and Cooling | 5.0★ (2) | 8 mi |
| Ready Air HVAC | 5.0★ (2) | 12 mi |
| Reliability Home Services | 4.7★ (539) | 15 mi |
| Scardina Plumbing-Heating Inc | 5.0★ (2) | 10 mi |
| Severn's Heating and Air Conditioning | 3.0★ (2) | 12 mi |
| Shielded Edge Property Solutions | 5.0★ (2) | 3 mi |
National price ranges in USD, not adjusted for Hanover. 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 836 Hanover 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 Hanover 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 |