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Emergency HVAC Contractors in Gaithersburg, MD (2026)

Top 50 of 1,005 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 Gaithersburg: GAC Services, 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 Gaithersburg at a glance

Top emergency HVAC contractors in Gaithersburg at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1GAC Services964.9★ (6,908)Gaithersburg24/7
2Presidential, Inc.944.9★ (1,701)Gaithersburg24/7
3Michael Bonsby HVAC, Plumbing & Electrical934.8★ (2,083)Gaithersburg24/7
4Parker Pearce Service Experts934.8★ (1,700)Gaithersburg24/7
5F.H. Furr Plumbing, Heating, Air Conditioning & Electrical934.7★ (5,985)Rockville, 5 mi away24/7
6Cool Breeze Plumbing, Heating & A/C924.8★ (666)Gaithersburg24/7
7Metro Services HVAC914.9★ (298)Gaithersburg24/7
8Vito Services914.7★ (1,351)Rockville, 5 mi away24/7
9Cyprus Air Heating, Cooling and Fireplaces914.7★ (1,402)Rockville, 6 mi away24/7
10Len The Plumber Heating & Air, LLC904.6★ (8,136)Silver Spring, 13 mi away24/7

Call an emergency HVAC contractor in Gaithersburg 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 Gaithersburg, 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 1,005 is on the HVAC contractors page.

Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  1. Ranked #1 in Gaithersburg

    #1 GAC Services

    Based in Gaithersburg

    96/100CR Score

    Ranked #1 because of its Google rating and availability: 4.9★ from 6,908 Google reviews, open 24/7.

    • 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

  8. #8 Vito Services

    Based in Rockville, 5 mi away

    91/100CR Score

    Ranked #8 because of its Google rating and availability: 4.7★ from 1,351 Google reviews, open 24/7.

    • 4.7★ from 1,351 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    681 Southlawn Ln, Rockville, MD 20850
    View profile for Vito Services(301) 861-3908

  13. #13 CroppMetcalfe

    Based in Fairfax, 19 mi away

    90/100CR Score

    Ranked #13 because of its Google rating and availability: 4.8★ from 7,638 Google reviews, open 24/7.

    • 4.8★ from 7,638 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    8421 Hilltop Rd, Fairfax, VA 22031
    View profile for CroppMetcalfe(703) 420-5030

  21. #21 M.E. Flow

    Based in Leesburg, 19 mi away

    89/100CR Score

    Ranked #21 because of its Google rating and availability: 4.8★ from 3,718 Google reviews, open 24/7.

    • 4.8★ from 3,718 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    12 Cardinal Park Dr SE STE 107, Leesburg, VA 20175
    View profile for M.E. Flow(571) 322-8847

  22. #22 United Air Temp

    Based in Sterling, 16 mi away

    89/100CR Score

    Ranked #22 because of its Google rating and availability: 4.8★ from 2,161 Google reviews, open 24/7.

    • 4.8★ from 2,161 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    45570 Shepard Dr Ste. #6, Sterling, VA 20164
    View profile for United Air Temp(571) 888-8078

  24. #24 Mario Bro, LLC

    Based in Gaithersburg

    89/100CR Score

    Ranked #24 because of its Google rating and availability: 5.0★ from 53 Google reviews, open 24/7.

    • 5.0★ from 53 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    18745 Blue Violet Ln, Gaithersburg, MD 20879
    View profile for Mario Bro, LLC(301) 325-6018

Top 50 of 1,005 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 Gaithersburg, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Meade's Heating and Air895.0★ (710)17 mi
27Cardinal Plumbing Heating & Air Inc884.9★ (745)16 mi
28United Air Temp884.7★ (75)In Gaithersburg
29John C. Flood884.8★ (4,976)24 mi
30AMS Air Conditioning & Heating884.9★ (116)7 mi
31Air 1 Mechanical Heating and Cooling884.9★ (440)15 mi
32B&B Air Conditioning & Heating Service885.0★ (357)16 mi
33Michael & Son Services884.7★ (419)10 mi
34NARFIX HEATING AND AIR CONDITIONING LLC885.0★ (293)15 mi
35Abdul HVAC875.0★ (34)2 mi
36AZA heating, cooling, plumbing & construction875.0★ (959)23 mi
37JC & JC HVAC874.7★ (503)12 mi
38Krafft Service Corporation874.9★ (1,631)24 mi
39Thomas E Clark Inc874.8★ (299)12 mi
40Nelson's HVAC, LLC874.9★ (627)19 mi
41Tim Whistler Plumbing, Gas Fitting, HVAC, and Electrical874.8★ (291)13 mi
42Wenbrooke Services - Electrical, Plumbing, Heating and Air874.8★ (1,208)20 mi
43One Hour Air Conditioning & Heating® of Mount Airy874.7★ (852)16 mi
44United Air Temp874.8★ (1,306)21 mi
45Environmental Systems Associates874.9★ (658)20 mi
46Clarksburg Heating874.9★ (60)7 mi
47Premier HVAC LLC875.0★ (230)16 mi
48Pro Sky Services875.0★ (484)22 mi
49C.D. Shanahan's HVAC, Plumbing, Electrical & Remodeling LLC874.9★ (966)23 mi
50Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical874.8★ (932)21 mi

How we ranked emergency HVAC contractors in Gaithersburg

Emergency lists move 10 points of the CR Score from reputation to availability: 25% and 20%. 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
Reputation25%Bayesian-adjusted Google star rating
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2
Review volume10%log10(reviews + 1) against the list maximum
Recency10%Share of reviews from the last 12 months
Availability20%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radius
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)

Emergency HVAC contractors in Gaithersburg: questions

Which HVAC contractors in Gaithersburg are open 24/7?

25 on this list post 24/7 hours, including GAC Services, Presidential, Inc., Michael Bonsby HVAC, Plumbing & Electrical, Parker Pearce Service Experts and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical.

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

GAC Services is #1, with a CR Score of 96 out of 100 on emergency weights.

How are emergency HVAC contractors in Gaithersburg ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 25% and 20%. 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?

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

Update log for Gaithersburg

  1. October 2026: CR Scores recalculated for 1,005 hvac contractors serving Gaithersburg.
  2. October 2026: 7 duplicate listings merged.

More emergency and heating and cooling pages