235 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Walkersville: Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical, CR Score 91/100; 4.8★ from 932 Google reviews; open 24/7.
Best for emergencies (open 24/7): Wenbrooke Services - Electrical, Plumbing, Heating and Air, posts 24/7 hours; ranked #2 of 235.
Most-reviewed: Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical, 4,764 Google reviews at 4.8★, the most of 235 ranked; ranked #12.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
235 Walkersville HVAC contractors are ranked here by CR Score, from 8 published factors. 66 are open 24/7, 131 open Saturdays and 96 open Sundays, based on posted hours. The median Google rating is 4.9★ across 235 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical | 91 | 4.8★ (932) | Frederick, 7 mi away | 24/7 | Overall |
| 2 | Wenbrooke Services - Electrical, Plumbing, Heating and Air | 91 | 4.8★ (1,208) | Frederick, 9 mi away | 24/7 | Emergencies |
| 3 | closed | 91 | 4.8★ (240) | Walkersville | 24/7 | — |
| 4 | Warner Service | 91 | 4.8★ (537) | Frederick, 5 mi away | 24/7 | — |
| 5 | Smock Heating & Air | 91 | 5.0★ (1,623) | Frederick, 6 mi away | Sat · Sun · Evenings | — |
| 6 | Markool Heating Cooling Plumbing | 90 | 4.9★ (547) | Frederick, 10 mi away | 24/7 | — |
| 7 | Frederick Air Inc | 90 | 4.8★ (414) | Frederick, 6 mi away | 24/7 | — |
| 8 | Urbana HVAC | 90 | 5.0★ (182) | Ballenger Creek, 7 mi away | 24/7 | — |
| 9 | May's Heating & Air Conditioning | 90 | 5.0★ (906) | Frederick, 4 mi away | Sat · Sun | — |
| 10 | United Air Temp | 89 | 4.7★ (928) | Frederick, 10 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 Walkersville
Based in Frederick, 7 mi away
Ranked #1 because of its Google rating and availability: 4.8★ from 932 Google reviews, open 24/7.
Based in Frederick, 9 mi away
Ranked #2 because of its Google rating and availability: 4.8★ from 1,208 Google reviews, open 24/7.
Based in Walkersville
Ranked #3 because of its Google rating and availability: 4.8★ from 240 Google reviews, open 24/7.
Based in Frederick, 5 mi away
Ranked #4 because of its Google rating and availability: 4.8★ from 537 Google reviews, open 24/7.
Based in Frederick, 6 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 1,623 Google reviews, listed on Google as “HVAC contractor”.
Based in Frederick, 10 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 547 Google reviews, open 24/7.
Based in Frederick, 6 mi away
Ranked #7 because of its Google rating and availability: 4.8★ from 414 Google reviews, open 24/7.
Based in Ballenger Creek, 7 mi away
Ranked #8 because of its Google rating and availability: 5.0★ from 182 Google reviews, open 24/7.
Based in Frederick, 4 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 906 Google reviews, listed on Google as “HVAC contractor”.
Based in Frederick, 10 mi away
Ranked #10 because of its Google rating and availability: 4.7★ from 928 Google reviews, open 24/7.
Based in Frederick, 7 mi away
Ranked #11 because of its Google rating and availability: 5.0★ from 111 Google reviews, open 24/7.
Based in Hagerstown, 24 mi away
Ranked #12 because of its Google rating and review volume: 4.8★ from 4,764 Google reviews, the most Google reviews on this list (4,764).
Based in Frederick, 9 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 1,614 Google reviews, listed on Google as “HVAC contractor”.
Based in Gaithersburg, 24 mi away
Ranked #14 because of its Google rating and availability: 4.9★ from 1,701 Google reviews, open 24/7.
Based in Mount Airy, 14 mi away
Ranked #15 because of its Google rating and availability: 4.7★ from 852 Google reviews, open 24/7.
Based in Walkersville
Ranked #16 because of its Google rating and availability: 5.0★ from 25 Google reviews, open 24/7.
Based in Westminster, 21 mi away
Ranked #17 because of its Google rating and availability: 4.9★ from 679 Google reviews, open 24/7.
Based in Gaithersburg, 24 mi away
Ranked #18 because of its Google rating and availability: 4.8★ from 2,083 Google reviews, open 24/7.
Based in Frederick, 9 mi away
Ranked #19 because of its Google rating and availability: 4.8★ from 165 Google reviews, open 24/7.
Based in Frederick, 9 mi away
Ranked #20 because of its Google rating and availability: 4.5★ from 724 Google reviews, open 24/7.
Based in Westminster, 21 mi away
Ranked #21 because of its Google rating and availability: 4.9★ from 580 Google reviews, open 24/7.
Based in Gaithersburg, 24 mi away
Ranked #22 because of its Google rating and availability: 4.8★ from 1,700 Google reviews, open 24/7.
Based in Eldersburg, 22 mi away
Ranked #23 because of its Google rating and availability: 4.7★ from 1,847 Google reviews, open 24/7.
Based in Westminster, 20 mi away
Ranked #24 because of its Google rating and availability: 5.0★ from 2,777 Google reviews, open 24/7.
Based in Hagerstown, 24 mi away
Ranked #25 because of its Google rating and availability: 4.9★ from 441 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 235 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 Quality HVAC | 5.0★ (2) | 22 mi |
| Air Zone Systems, Inc | 5.0★ (2) | 17 mi |
| AM/PM Emergency Services a division of Robert E Clubb & Associates | 5.0★ (2) | 13 mi |
| ASC HVAC | 4.7★ (13) | 22 mi |
| Forever Air Duct Cleaning | 5.0★ (6) | 6 mi |
| Heating & Cooling Certified Mechanic LLC | 5.0★ (2) | 15 mi |
| Home Services at The Home Depot | 3.5★ (2) | 21 mi |
| Home Services at The Home Depot | 3.0★ (2) | 21 mi |
| Home Services at The Home Depot | 1.0★ (1) | 7 mi |
| Jacks Heating & AC | 5.0★ (1) | 5 mi |
| JLB Mechanical Heating & Cooling, Inc. | 5.0★ (16) | 22 mi |
| Long Mechanical Services LLC | 5.0★ (19) | 21 mi |
| Mayne Source Heating & Air | 5.0★ (2) | 10 mi |
| P W Scholl Plumbing & Heating Inc | 5.0★ (2) | 18 mi |
| Paul W Mccarney AC & Refrigeration | 3.0★ (2) | 23 mi |
| Precision Heating & Cooling, Inc. | 2.8★ (12) | 3 mi |
| Precision Westminster HVAC Repair | 5.0★ (10) | 21 mi |
| Siegman Forced Air Systems, Inc. | 4.7★ (30) | 21 mi |
| Thurmont Plumbing & Heating | 5.0★ (1) | 11 mi |
| United Air Temp | 4.7★ (75) | 25 mi |
National price ranges in USD, not adjusted for Walkersville. 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 235 Walkersville 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 Walkersville 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 |