968 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Walker Mill: Belair Engineering and Service Company, Inc., CR Score 91/100; 4.9★ from 1,421 Google reviews; open 24/7.
Best for emergencies (open 24/7): United Air Temp, posts 24/7 hours; ranked #2 of 968.
Most-reviewed: Michael & Son Services, 15,537 Google reviews at 4.7★, the most of 968 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
968 Walker Mill HVAC contractors are ranked here by CR Score, from 8 published factors. 306 are open 24/7, 633 open Saturdays and 437 open Sundays, based on posted hours. The median Google rating is 4.9★ across 968 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Belair Engineering and Service Company, Inc. | 91 | 4.9★ (1,421) | Greater Upper Marlboro, 9 mi away | 24/7 | Overall |
| 2 | United Air Temp | 91 | 4.8★ (1,775) | Fort Washington, 6 mi away | 24/7 | Emergencies |
| 3 | Michael & Son Services | 90 | 4.7★ (15,537) | Alexandria, 16 mi away | 24/7 | Most reviews |
| 4 | Michael & Son Services | 90 | 4.8★ (8,326) | Hyattsville, 5 mi away | Sat · Sun | — |
| 5 | United Air Temp | 90 | 4.8★ (1,306) | Greenbelt, 8 mi away | 24/7 | — |
| 6 | John C. Flood | 90 | 4.8★ (4,976) | Alexandria, 16 mi away | 24/7 | — |
| 7 | AZA heating, cooling, plumbing & construction | 90 | 5.0★ (959) | Alexandria, 14 mi away | 24/7 | — |
| 8 | CroppMetcalfe | 90 | 4.8★ (7,638) | Fairfax, 19 mi away | 24/7 | — |
| 9 | Krafft Service Corporation | 90 | 4.9★ (1,631) | Alexandria, 14 mi away | 24/7 | — |
| 10 | Len The Plumber Heating & Air, LLC | 90 | 4.6★ (8,136) | Silver Spring, 12 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 Walker Mill
Based in Greater Upper Marlboro, 9 mi away
Ranked #1 because of its Google rating and availability: 4.9★ from 1,421 Google reviews, open 24/7.
Based in Fort Washington, 6 mi away
Ranked #2 because of its Google rating and availability: 4.8★ from 1,775 Google reviews, open 24/7.
Based in Alexandria, 16 mi away
Ranked #3 because of its Google rating and review volume: 4.7★ from 15,537 Google reviews, the most Google reviews on this list (15,537).
Based in Hyattsville, 5 mi away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 8,326 Google reviews, listed on Google as “HVAC contractor”.
Based in Greenbelt, 8 mi away
Ranked #5 because of its Google rating and availability: 4.8★ from 1,306 Google reviews, open 24/7.
Based in Alexandria, 16 mi away
Ranked #6 because of its Google rating and availability: 4.8★ from 4,976 Google reviews, open 24/7.
Based in Alexandria, 14 mi away
Ranked #7 because of its Google rating and availability: 5.0★ from 959 Google reviews, open 24/7.
Based in Fairfax, 19 mi away
Ranked #8 because of its Google rating and availability: 4.8★ from 7,638 Google reviews, open 24/7.
Based in Alexandria, 14 mi away
Ranked #9 because of its Google rating and availability: 4.9★ from 1,631 Google reviews, open 24/7.
Based in Silver Spring, 12 mi away
Ranked #10 because of its Google rating and availability: 4.6★ from 8,136 Google reviews, open 24/7.
Based in Crofton, 13 mi away
Ranked #11 because of its Google rating and availability: 4.9★ from 1,156 Google reviews, open 24/7.
Based in Alexandria, 9 mi away
Ranked #12 because of its Google rating and availability: 4.9★ from 508 Google reviews, open 24/7.
Based in Cheverly, 3 mi away
Ranked #13 because of its Google rating and availability: 4.9★ from 166 Google reviews, open 24/7.
Based in Gaithersburg, 24 mi away
Ranked #14 because of its Google rating and availability: 4.9★ from 6,908 Google reviews, open 24/7.
Based in Silver Spring, 11 mi away
Ranked #15 because of its Google rating and availability: 5.0★ from 293 Google reviews, open 24/7.
Based in Rosaryville, 19 mi away
Ranked #16 because of its Google rating and availability: 5.0★ from 1,032 Google reviews, open 24/7.
Based in Fairfax, 18 mi away
Ranked #17 because of its Google rating and availability: 4.9★ from 1,794 Google reviews, open 24/7.
Based in Annapolis, 21 mi away
Ranked #18 because of its Google rating and availability: 4.9★ from 2,904 Google reviews, open 24/7.
Based in Washington, D.C., 6 mi away
Ranked #19 because of its Google rating and availability: 4.9★ from 205 Google reviews, open 24/7.
Based in Clarksburg, 6 mi away
Ranked #20 because of its Google rating and availability: 4.8★ from 302 Google reviews, open 24/7.
Based in St. Charles, 8 mi away
Ranked #21 because of its Google rating and availability: 4.9★ from 270 Google reviews, open 24/7.
Based in Alexandria, 12 mi away
Ranked #22 because of its Google rating and availability: 4.9★ from 440 Google reviews, open 24/7.
Based in Largo, 3 mi away
Ranked #23 because of its Google rating and availability: 4.8★ from 176 Google reviews, open 24/7.
Based in Waldorf, 18 mi away
Ranked #24 because of its Google rating and availability: 5.0★ from 625 Google reviews, open 24/7.
Based in Alexandria, 15 mi away
Ranked #25 because of its Google rating and availability: 4.8★ from 1,318 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 968 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 |
|---|---|---|
| Absolute Supply and Services, LLC | 4.5★ (2) | 4 mi |
| Barivo HVAC Repair Washington | 5.0★ (2) | 9 mi |
| Cora AC | 5.0★ (2) | 7 mi |
| Coreno HVAC Repair Washington | 5.0★ (2) | 9 mi |
| Cyprus Air Heating, Cooling and Fireplaces | 4.7★ (1,402) | 20 mi |
| DC HVAC, Heating and Air Conditioning | 5.0★ (2) | 7 mi |
| Heravo HVAC Repair Washington | 5.0★ (2) | 8 mi |
| Homestead Handymen HVAC/R, LLC | 5.0★ (2) | 9 mi |
| Horizon Mechanical Services LLC | 5.0★ (2) | 3 mi |
| JDL HVAC & Plumbing Services | 4.8★ (678) | 15 mi |
| Logan Mechanical LLC | 4.7★ (155) | 7 mi |
| R And R Climate Control Inc | 5.0★ (2) | 9 mi |
| S&W Controls, Inc. | 5.0★ (2) | 3 mi |
| T & T Plumbing And Heating | 5.0★ (2) | 6 mi |
| Teravo HVAC Repair Washington | 5.0★ (2) | 9 mi |
| TRINITY PRO SERVICES | 4.7★ (257) | 3 mi |
| Ultra Painting HVAC Pros | 5.0★ (2) | 8 mi |
| United Service Company | 5.0★ (2) | 2 mi |
| Xavino HVAC Repair Washington | 5.0★ (2) | 9 mi |
| Zelavo HVAC Repair Washington | 5.0★ (2) | 9 mi |
National price ranges in USD, not adjusted for Walker Mill. 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 968 Walker Mill 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 Walker Mill 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 |