618 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Randallstown: Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, CR Score 65/100; 4.8★ from 4,514 Google reviews; open 24/7.
Best for emergencies (open 24/7): Farnen & Dermer, posts 24/7 hours; ranked #2 of 618.
Most-reviewed: Len The Plumber Heating & Air, LLC, 15,911 Google reviews at 4.7★, the most of 618 ranked; ranked #11.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
618 Randallstown HVAC contractors are ranked here by CR Score, from ten published factors. 180 are open 24/7, 356 open Saturdays and 267 open Sundays, based on posted hours. The median Google rating is 4.8★ across 618 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical | 65 | 4.8★ (4,514) | Baltimore, 3 mi away | 24/7 | Overall |
| 2 | Farnen & Dermer | 63 | 4.8★ (931) | Owings Mills, 4 mi away | 24/7 | Emergencies |
| 3 | Michael & Son Services | 62 | 4.7★ (8,039) | Baltimore, 14 mi away | 24/7 | — |
| 4 | Triple E | 62 | 4.9★ (469) | Reisterstown, 6 mi away | 24/7 | — |
| 5 | Complete Climate Services LLC | 62 | 5.0★ (786) | Baltimore, 12 mi away | 24/7 | — |
| 6 | Alpha Heating & Air Conditioning, LLC | 61 | 4.9★ (419) | Arbutus, 8 mi away | 24/7 | — |
| 7 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 61 | 4.7★ (1,847) | Eldersburg, 12 mi away | 24/7 | — |
| 8 | United Air Temp | 61 | 4.9★ (180) | Owings Mills, 4 mi away | 24/7 | — |
| 9 | Elmar Heating & Cooling | 61 | 4.8★ (614) | Timonium, 10 mi away | 24/7 | — |
| 10 | Thomas D. Stern Air Experts Inc. | 61 | 5.0★ (699) | Eldersburg, 10 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 in Randallstown
Based in Baltimore, 3 mi away
Ranked #1 because of its Google rating and trade focus: 4.8★ from 4,514 Google reviews, listed on Google as “HVAC contractor”.
Based in Owings Mills, 4 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 931 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore, 14 mi away
Ranked #3 because of its Google rating and trade focus: 4.7★ from 8,039 Google reviews, listed on Google as “HVAC contractor”.
Based in Reisterstown, 6 mi away
Ranked #4 because of its Google rating and trade focus: 4.9★ from 469 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore, 12 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 786 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 8 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 419 Google reviews, listed on Google as “HVAC contractor”.
Based in Eldersburg, 12 mi away
Ranked #7 because of its Google rating and trade focus: 4.7★ from 1,847 Google reviews, listed on Google as “HVAC contractor”.
Based in Owings Mills, 4 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 180 Google reviews, listed on Google as “HVAC contractor”.
Based in Timonium, 10 mi away
Ranked #9 because of its Google rating and trade focus: 4.8★ from 614 Google reviews, listed on Google as “HVAC contractor”.
Based in Eldersburg, 10 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 699 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 10 mi away
Ranked #11 because of its Google rating and review volume: 4.7★ from 15,911 Google reviews, the most in Randallstown.
Based in Columbia, 14 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 658 Google reviews, listed on Google as “HVAC contractor”.
Based in Dundalk, 19 mi away
Ranked #13 because of its Google rating and trade focus: 4.9★ from 1,461 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore, 9 mi away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 354 Google reviews, listed on Google as “HVAC contractor”.
Based in Baltimore, 7 mi away
Ranked #15 because of its Google rating and trade focus: 4.8★ from 219 Google reviews, listed on Google as “HVAC contractor”.
Based in Arbutus, 10 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 275 Google reviews, listed on Google as “HVAC contractor”.
Based in Hanover, 16 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 2,167 Google reviews, listed on Google as “HVAC contractor”.
Based in Ellicott City, 6 mi away
Ranked #18 because of its Google rating and trade focus: 4.8★ from 494 Google reviews, listed on Google as “HVAC contractor”.
Based in Hanover, 13 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 729 Google reviews, listed on Google as “HVAC contractor”.
Based in Eldersburg, 4 mi away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 76 Google reviews, listed on Google as “HVAC contractor”.
Based in Westminster, 16 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 580 Google reviews, listed on Google as “HVAC contractor”.
Based in Randallstown
Ranked #22 because of its Google rating and trade focus: 5.0★ from 33 Google reviews, listed on Google as “HVAC contractor”.
Based in Columbia, 9 mi away
Ranked #23 because of its Google rating and trade focus: 4.8★ from 238 Google reviews, listed on Google as “HVAC contractor”.
Based in Kew Gardens Hills, 10 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 177 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Arbutus, 10 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 142 Google reviews, listed on Google as “HVAC contractor”.
#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 618 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) | 12 mi |
| Around the Clock Plumbing & Heating | 5.0★ (2) | 12 mi |
| Beltway Air Conditioning, Heating & Plumbing | 4.9★ (90) | 11 mi |
| Capitol Boiler Works | 1.0★ (2) | 10 mi |
| Caton's Plumbing Heating & AC | 1.0★ (1) | In Randallstown |
| Commercial CAD | 5.0★ (2) | 18 mi |
| Davis Plumbing & Heating Inc | 5.0★ (2) | 15 mi |
| DJE Plumbing and Heating | 5.0★ (2) | 18 mi |
| garagedoorsrepairellicottcitymd | 5.0★ (2) | 8 mi |
| Hughes Mechanical, LLC | 4.8★ (408) | 18 mi |
| JC & JC HVAC | 4.7★ (503) | 21 mi |
| Mattei Compressors Inc | 4.8★ (4) | In Randallstown |
| Meleney Equipment Inc | 5.0★ (2) | 16 mi |
| Palmer Heating and Cooling | 5.0★ (2) | 10 mi |
| Reliability Home Services | 4.7★ (539) | 19 mi |
| Scardina Plumbing-Heating Inc | 5.0★ (2) | 11 mi |
| Shielded Edge Property Solutions | 5.0★ (2) | 12 mi |
| THE ELECTRICIANS | 4.9★ (98) | 14 mi |
| United Air Temp | 4.8★ (171) | 15 mi |
| Witkowski Mechanical | 4.6★ (40) | 5 mi |
National price ranges in USD, not adjusted for Randallstown. 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 618 Randallstown HVAC contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Randallstown data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |