873 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Ellicott City: Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, CR Score 93/100; 4.8★ from 4,514 Google reviews; open 24/7.
Best for emergencies (open 24/7): Complete Climate Services LLC, posts 24/7 hours; ranked #2 of 873.
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 873 ranked; ranked #10.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
873 Ellicott City HVAC contractors are ranked here by CR Score, from 8 published factors. 239 are open 24/7, 523 open Saturdays and 380 open Sundays, based on posted hours. The median Google rating is 4.8★ across 873 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 93 | 4.8★ (4,514) | Baltimore, 5 mi away | 24/7 | Overall |
| 2 | Complete Climate Services LLC | 90 | 5.0★ (786) | Baltimore, 11 mi away | 24/7 | Emergencies |
| 3 | Environmental Systems Associates | 90 | 4.9★ (658) | Columbia, 7 mi away | 24/7 | — |
| 4 | Michael & Son Services | 90 | 4.7★ (8,039) | Baltimore, 14 mi away | 24/7 | — |
| 5 | GAC Services | 89 | 4.9★ (6,908) | Gaithersburg, 22 mi away | 24/7 | — |
| 6 | Alpha Heating & Air Conditioning, LLC | 89 | 4.9★ (419) | Arbutus, 8 mi away | 24/7 | — |
| 7 | Boothe's Heating, Air, Plumbing, Drains & Electrical | 89 | 4.9★ (1,461) | Dundalk, 15 mi away | 24/7 | — |
| 8 | Sila Heating, Air Conditioning & Plumbing | 89 | 4.9★ (275) | Arbutus, 6 mi away | 24/7 | — |
| 9 | Greenfox Cooling, Heating & Plumbing | 89 | 4.8★ (238) | Columbia, 3 mi away | 24/7 | — |
| 10 | Len The Plumber Heating & Air, LLC | 89 | 4.7★ (15,911) | Arbutus, 7 mi away | 24/7 | Most reviews |
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 Ellicott City
Based in Baltimore, 5 mi away
Ranked #1 because of its Google rating and availability: 4.8★ from 4,514 Google reviews, open 24/7.
Based in Baltimore, 11 mi away
Ranked #2 because of its Google rating and availability: 5.0★ from 786 Google reviews, open 24/7.
Based in Columbia, 7 mi away
Ranked #3 because of its Google rating and availability: 4.9★ from 658 Google reviews, open 24/7.
Based in Baltimore, 14 mi away
Ranked #4 because of its Google rating and availability: 4.7★ from 8,039 Google reviews, open 24/7.
Based in Gaithersburg, 22 mi away
Ranked #5 because of its Google rating and availability: 4.9★ from 6,908 Google reviews, open 24/7.
Based in Arbutus, 8 mi away
Ranked #6 because of its Google rating and availability: 4.9★ from 419 Google reviews, open 24/7.
Based in Dundalk, 15 mi away
Ranked #7 because of its Google rating and availability: 4.9★ from 1,461 Google reviews, open 24/7.
Based in Arbutus, 6 mi away
Ranked #8 because of its Google rating and availability: 4.9★ from 275 Google reviews, open 24/7.
Based in Columbia, 3 mi away
Ranked #9 because of its Google rating and availability: 4.8★ from 238 Google reviews, open 24/7.
Based in Arbutus, 7 mi away
Ranked #10 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 Owings Mills, 11 mi away
Ranked #11 because of its Google rating and availability: 4.8★ from 931 Google reviews, open 24/7.
Based in Eldersburg, 5 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 699 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 8 mi away
Ranked #13 because of its Google rating and availability: 4.9★ from 217 Google reviews, open 24/7.
Based in Arbutus, 6 mi away
Ranked #14 because of its Google rating and availability: 4.9★ from 142 Google reviews, open 24/7.
Based in Reisterstown, 13 mi away
Ranked #15 because of its Google rating and availability: 4.9★ from 469 Google reviews, open 24/7.
Based in Gaithersburg, 21 mi away
Ranked #16 because of its Google rating and availability: 4.9★ from 1,701 Google reviews, open 24/7.
Based in Hanover, 7 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 729 Google reviews, listed on Google as “HVAC contractor”.
Based in Hanover, 10 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 2,167 Google reviews, listed on Google as “HVAC contractor”.
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 Baltimore, 10 mi away
Ranked #20 because of its Google rating and availability: 4.8★ from 354 Google reviews, open 24/7.
Based in Annapolis, 24 mi away
Ranked #21 because of its Google rating and availability: 4.9★ from 2,904 Google reviews, open 24/7.
Based in Ellicott City
Ranked #22 because of its Google rating and trade focus: 4.9★ from 330 Google reviews, listed on Google as “HVAC contractor”.
Based in Rockville, 22 mi away
Ranked #23 because of its Google rating and availability: 4.7★ from 5,985 Google reviews, open 24/7.
Based in Crofton, 20 mi away
Ranked #24 because of its Google rating and availability: 4.9★ from 1,156 Google reviews, open 24/7.
Based in Baltimore, 8 mi away
Ranked #25 because of its Google rating and availability: 4.8★ from 219 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 873 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 C Tech LLC | 5.0★ (1) | In Ellicott City |
| A-Gas Rapid Recovery - Baltimore | 5.0★ (2) | 13 mi |
| Around the Clock Plumbing & Heating | 5.0★ (2) | 7 mi |
| Barstow & Sons Heating and Cooling | 4.9★ (1,127) | 25 mi |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (90) | 5 mi |
| Bill Myers Inc | 4.5★ (2) | 12 mi |
| Capitol Boiler Works | 1.0★ (2) | 7 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 11 mi |
| DJE Plumbing and Heating | 5.0★ (2) | 15 mi |
| F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 4.8★ (1,788) | 10 mi |
| garagedoorsrepairellicottcitymd | 5.0★ (2) | In Ellicott City |
| Home Services at The Home Depot | 3.0★ (2) | 12 mi |
| Husky Home Services | 4.8★ (40) | In Ellicott City |
| JC & JC HVAC | 4.7★ (503) | 15 mi |
| Meleney Equipment Inc | 5.0★ (2) | 9 mi |
| One Call Services | 5.0★ (2) | 16 mi |
| Palmer Heating and Cooling | 5.0★ (2) | 4 mi |
| Scardina Plumbing-Heating Inc | 5.0★ (2) | 11 mi |
| Schumacher & Seiler | 4.6★ (18) | In Ellicott City |
| Shielded Edge Property Solutions | 5.0★ (2) | 8 mi |
National price ranges in USD, not adjusted for Ellicott City. 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 873 Ellicott City 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 Ellicott City 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 |