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Emergency HVAC Contractors in Ellicott City, MD (2026)

Top 50 of 832 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in Ellicott City: Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, open 24/7.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

Top emergency HVAC contractors in Ellicott City at a glance

Top emergency HVAC contractors in Ellicott City at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical654.8★ (4,514)Baltimore, 5 mi away24/7
2Beltway Air Conditioning, Heating & Plumbing634.9★ (2,167)Hanover, 10 mi away24/7
3Michael & Son Services634.7★ (8,039)Baltimore, 14 mi away24/7
4Environmental Systems Associates634.9★ (658)Columbia, 7 mi away24/7
5Len The Plumber Heating & Air, LLC624.7★ (15,911)Arbutus, 7 mi away24/7
6ARS / Rescue Rooter624.4★ (3,510)Laurel, 10 mi away24/7
7Complete Climate Services LLC625.0★ (786)Baltimore, 11 mi away24/7
8Greenfox Cooling, Heating & Plumbing624.8★ (238)Columbia, 3 mi away24/7
9Farnen & Dermer624.8★ (931)Owings Mills, 11 mi away24/7
10GAC Services624.9★ (6,908)Gaithersburg, 22 mi away24/7

Call an emergency HVAC contractor in Ellicott City now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in Ellicott City, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 832 is on the HVAC contractors page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  6. #6 ARS / Rescue Rooter

    Based in Laurel, 10 mi away

    62/100CR Score

    Ranked #6 because of its Google rating and trade focus: 4.4★ from 3,510 Google reviews, listed on Google as “HVAC contractor”.

    • 4.4★ from 3,510 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    9010 Maier Rd # 105, Laurel, MD 20723
    View profile for ARS / Rescue Rooter(301) 276-4499

  9. #9 Farnen & Dermer

    Based in Owings Mills, 11 mi away

    62/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.8★ from 931 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 931 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    10500 Reisterstown Rd, Owings Mills, MD 21117
    View profile for Farnen & Dermer(410) 367-7777

  10. #10 GAC Services

    Based in Gaithersburg, 22 mi away

    62/100CR Score

    Ranked #10 because of its Google rating and trade focus: 4.9★ from 6,908 Google reviews, listed on Google as “Heating contractor”.

    • 4.9★ from 6,908 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    227 E Deer Park Dr, Gaithersburg, MD 20877
    View profile for GAC Services(301) 202-1641

  18. #18 Tario HVAC, LLC

    Based in Arbutus, 6 mi away

    61/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.9★ from 142 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 142 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1319 Maple Ave, Halethorpe, MD 21227
    View profile for Tario HVAC, LLC(410) 314-1161

  19. #19 JDL HVAC & Plumbing Services

    Based in Laurel, 13 mi away

    61/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.8★ from 678 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 678 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    14300 Cherry Lane Ct Ste 116, Laurel, MD 20707
    View profile for JDL HVAC & Plumbing Services

  22. #22 Triple E

    Based in Reisterstown, 13 mi away

    61/100CR Score

    Ranked #22 because of its Google rating and trade focus: 4.9★ from 469 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 469 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    655 Main St #1959, Reisterstown, MD 21136
    View profile for Triple E(410) 833-1133

  25. #25 Ambient LLC

    Based in Severn, 11 mi away

    60/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.8★ from 336 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 336 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    508 Shaw Ct #103, Severn, MD 21144
    View profile for Ambient LLC(410) 429-7280

Top 50 of 832 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in Ellicott City, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Presidential, Inc.604.9★ (1,701)21 mi
27Michael Bonsby HVAC, Plumbing & Electrical604.8★ (2,083)21 mi
28Husky Home Services604.8★ (40)In Ellicott City
29Staton Heating, Cooling & Plumbing604.9★ (2,904)24 mi
30United Air Temp604.8★ (171)8 mi
31Mars Air Duct Cleaning604.9★ (177)10 mi
32Elmar Heating & Cooling604.8★ (614)15 mi
33Grove Heating & Cooling604.9★ (1,156)20 mi
34Parker Pearce Service Experts604.8★ (1,700)21 mi
35THE ELECTRICIANS604.9★ (98)7 mi
36United Air Temp604.8★ (1,306)20 mi
37At Your Service Heating and Cooling LLC604.6★ (811)14 mi
38Beyond Cooling LLC604.9★ (82)6 mi
39Carver Heating & Cooling605.0★ (46)4 mi
40United Air Temp604.9★ (180)11 mi
41Breezy Heating Ventilation and Air Conditioning604.8★ (121)9 mi
42ROCKY LLC604.6★ (253)10 mi
43JC & JC HVAC604.7★ (503)15 mi
44Wenbrooke Services - Electrical, Plumbing, Heating, and Air595.0★ (49)6 mi
45Beltway Air Conditioning, Heating and Plumbing595.0★ (129)12 mi
46A.J. Michaels594.5★ (309)11 mi
47Maryland Heating & Air594.9★ (369)17 mi
48USA HVAC Services595.0★ (179)15 mi
49One Hour Air Conditioning & Heating® of Mount Airy594.7★ (852)19 mi
50Vito Services594.7★ (1,351)22 mi

How we ranked emergency HVAC contractors in Ellicott City

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in Ellicott City: questions

Which HVAC contractors in Ellicott City are open 24/7?

25 on this list post 24/7 hours, including Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, Beltway Air Conditioning, Heating & Plumbing, Michael & Son Services, Environmental Systems Associates and Len The Plumber Heating & Air, LLC.

Who is ranked #1 for emergency heating and cooling in Ellicott City, MD?

Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical is #1, with a CR Score of 65 out of 100 on emergency weights.

How are emergency HVAC contractors in Ellicott City ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

24 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Ellicott City

  1. October 2026: CR Scores recalculated for 832 hvac contractors serving Ellicott City.
  2. October 2026: 3 duplicate listings merged.

More emergency and heating and cooling pages