658 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Dundalk: Boothe's Heating, Air, Plumbing, Drains & Electrical, CR Score 93/100; 4.9★ from 1,461 Google reviews; open 24/7.
Best for emergencies (open 24/7): Michael & Son Services, posts 24/7 hours; ranked #2 of 658.
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 658 ranked; ranked #14.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
658 Dundalk HVAC contractors are ranked here by CR Score, from 8 published factors. 191 are open 24/7, 391 open Saturdays and 294 open Sundays, based on posted hours. The median Google rating is 4.8★ across 658 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Boothe's Heating, Air, Plumbing, Drains & Electrical | 93 | 4.9★ (1,461) | Dundalk | 24/7 | Overall |
| 2 | Michael & Son Services | 93 | 4.7★ (8,039) | Baltimore, 4 mi away | 24/7 | Emergencies |
| 3 | Complete Climate Services LLC | 92 | 5.0★ (786) | Baltimore, 5 mi away | 24/7 | — |
| 4 | USA HVAC Services | 91 | 5.0★ (179) | Dundalk | 24/7 | — |
| 5 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 90 | 4.8★ (4,514) | Baltimore, 14 mi away | 24/7 | — |
| 6 | Reliability Home Services | 90 | 4.7★ (539) | Dundalk | 24/7 | — |
| 7 | Maryland Heating & Air | 90 | 4.9★ (369) | Essex, 5 mi away | 24/7 | — |
| 8 | Contemporary Air Systems, Inc. | 90 | 5.0★ (195) | Essex, 5 mi away | 24/7 | — |
| 9 | Staton Heating, Cooling & Plumbing | 89 | 4.9★ (2,904) | Annapolis, 19 mi away | 24/7 | — |
| 10 | Hughes Mechanical, LLC | 89 | 4.8★ (408) | Essex, 5 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 because of its Google rating and availability: 4.9★ from 1,461 Google reviews, open 24/7.
Based in Baltimore, 4 mi away
Ranked #2 because of its Google rating and availability: 4.7★ from 8,039 Google reviews, open 24/7.
Based in Baltimore, 5 mi away
Ranked #3 because of its Google rating and availability: 5.0★ from 786 Google reviews, open 24/7.
Based in Dundalk
Ranked #4 because of its Google rating and availability: 5.0★ from 179 Google reviews, open 24/7.
Based in Baltimore, 14 mi away
Ranked #5 because of its Google rating and availability: 4.8★ from 4,514 Google reviews, open 24/7.
Based in Dundalk
Ranked #6 because of its Google rating and availability: 4.7★ from 539 Google reviews, open 24/7.
Based in Essex, 5 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 369 Google reviews, open 24/7.
Based in Essex, 5 mi away
Ranked #8 because of its Google rating and availability: 5.0★ from 195 Google reviews, open 24/7.
Based in Annapolis, 19 mi away
Ranked #9 because of its Google rating and availability: 4.9★ from 2,904 Google reviews, open 24/7.
Based in Essex, 5 mi away
Ranked #10 because of its Google rating and availability: 4.8★ from 408 Google reviews, open 24/7.
Based in Arbutus, 9 mi away
Ranked #11 because of its Google rating and availability: 4.9★ from 419 Google reviews, open 24/7.
Based in Dundalk
Ranked #12 because of its Google rating and availability: 4.7★ from 247 Google reviews, open 24/7.
Based in Baltimore, 3 mi away
Ranked #13 because of its Google rating and availability: 4.6★ from 811 Google reviews, open 24/7.
Based in Arbutus, 8 mi away
Ranked #14 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 Arbutus, 8 mi away
Ranked #15 because of its Google rating and availability: 4.9★ from 217 Google reviews, open 24/7.
Based in Arbutus, 9 mi away
Ranked #16 because of its Google rating and availability: 4.9★ from 275 Google reviews, open 24/7.
Based in Baltimore, 8 mi away
Ranked #17 because of its Google rating and availability: 4.8★ from 354 Google reviews, open 24/7.
Based in Kew Gardens Hills, 8 mi away
Ranked #18 because of its Google rating and availability: 4.9★ from 177 Google reviews, open 24/7.
Based in Arbutus, 8 mi away
Ranked #19 because of its Google rating and availability: 4.7★ from 472 Google reviews, open 24/7.
Based in Annapolis, 19 mi away
Ranked #20 because of its Google rating and availability: 4.9★ from 1,127 Google reviews, open 24/7.
Based in Hanover, 11 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 2,167 Google reviews, listed on Google as “HVAC contractor”.
Based in Crofton, 20 mi away
Ranked #22 because of its Google rating and availability: 4.9★ from 1,156 Google reviews, open 24/7.
Based in Severn, 11 mi away
Ranked #23 because of its Google rating and availability: 4.8★ from 336 Google reviews, open 24/7.
Based in Columbia, 18 mi away
Ranked #24 because of its Google rating and availability: 4.9★ from 658 Google reviews, open 24/7.
Based in Arbutus, 9 mi away
Ranked #25 because of its Google rating and availability: 4.9★ from 142 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 658 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 |
|---|---|---|
| Aire-Craft Heating & Cooling Co Inc | 4.8★ (26) | 4 mi |
| All About Everything HVAC & Maintenance | 3.0★ (2) | 8 mi |
| American Mechanical Repair | 3.0★ (2) | 9 mi |
| Around the Clock Plumbing & Heating | 5.0★ (2) | 10 mi |
| Capitol Boiler Works | 1.0★ (2) | 8 mi |
| ClimateCare HVAC Services, LLC. | 4.9★ (221) | 19 mi |
| Commercial CAD | 5.0★ (2) | 5 mi |
| CRG Heating and Cooling | 5.0★ (10) | In Dundalk |
| DJE Plumbing and Heating | 5.0★ (2) | 2 mi |
| DM3 Heating & Air | 5.0★ (2) | 4 mi |
| Elite Heating And Cooling | 3.0★ (2) | 10 mi |
| JDL HVAC & Plumbing Services | 4.8★ (678) | 21 mi |
| oncall-garageservice | 5.0★ (2) | 10 mi |
| R & G Plumbing & Heating | 5.0★ (2) | 6 mi |
| Ready Air HVAC | 5.0★ (2) | 4 mi |
| Scardina Plumbing-Heating Inc | 5.0★ (2) | 6 mi |
| Severn's Heating and Air Conditioning | 3.0★ (2) | 12 mi |
| Shielded Edge Property Solutions | 5.0★ (2) | 9 mi |
| TRIO HVACR SERVICES | 5.0★ (2) | 5 mi |
| Wrangler Plumbing & Heating | 5.0★ (2) | 8 mi |
National price ranges in USD, not adjusted for Dundalk. 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 658 Dundalk 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 Dundalk 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 |