Skip to content
ContractorsRanked

Emergency HVAC Contractors in Walker Mill, MD (2026)

Top 50 of 969 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 Walker Mill: United Air Temp, 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 Walker Mill at a glance

Top emergency HVAC contractors in Walker Mill at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1United Air Temp644.8★ (1,775)Fort Washington, 6 mi away24/7
2Michael & Son Services644.7★ (15,537)Alexandria, 16 mi away24/7
3Len The Plumber Heating & Air, LLC634.6★ (8,136)Silver Spring, 12 mi away24/7
4Belair Engineering and Service Company, Inc.634.9★ (1,421)Greater Upper Marlboro, 9 mi away24/7
5United Air Temp634.8★ (1,306)Greenbelt, 8 mi away24/7
6John C. Flood634.8★ (4,976)Alexandria, 16 mi away24/7
7CroppMetcalfe624.8★ (7,638)Fairfax, 19 mi away24/7
8Krafft Service Corporation624.9★ (1,631)Alexandria, 14 mi away24/7
9Grove Heating & Cooling624.9★ (1,156)Crofton, 13 mi away24/7
10AZA heating, cooling, plumbing & construction625.0★ (959)Alexandria, 14 mi away24/7

Call an emergency HVAC contractor in Walker Mill 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 Walker Mill, 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 969 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.

  1. Ranked #1 in Walker Mill

    #1 United Air Temp

    Based in Fort Washington, 6 mi away

    64/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.8★ from 1,775 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 1,775 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    5620 St Barnabas Rd Ste 240, Fort Washington, MD 20744
    View profile for United Air Temp(240) 342-3956

  5. #5 United Air Temp

    Based in Greenbelt, 8 mi away

    63/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.8★ from 1,306 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 1,306 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    7255 Hanover Pkwy Ste A, Greenbelt, MD 20770
    View profile for United Air Temp(240) 713-3314

  6. #6 John C. Flood

    Based in Alexandria, 16 mi away

    63/100CR Score

    Ranked #6 because of its Google rating and trade focus: 4.8★ from 4,976 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 4,976 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    6430 General Green Way, Alexandria, VA 22312
    View profile for John C. Flood(571) 605-7008

  7. #7 CroppMetcalfe

    Based in Fairfax, 19 mi away

    62/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.8★ from 7,638 Google reviews, listed on Google as “HVAC contractor”.

    • 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

  13. #13 Caffi Services

    Based in Alexandria, 9 mi away

    62/100CR Score

    Ranked #13 because of its Google rating and trade focus: 4.9★ from 508 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 508 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1313 Powhatan St, Alexandria, VA 22314
    View profile for Caffi Services(703) 962-6052

  18. #18 GAC Services

    Based in Gaithersburg, 24 mi away

    61/100CR Score

    Ranked #18 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

  19. #19 All-Pro Inc

    Based in Greater Upper Marlboro, 2 mi away

    61/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.5★ from 246 Google reviews, listed on Google as “Air conditioning contractor”.

    • 4.5★ from 246 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1215 Ritchie Rd, Capitol Heights, MD 20743
    View profile for All-Pro Inc(866) 941-4328

  24. #24 United Air Temp

    Based in Alexandria, 15 mi away

    61/100CR Score

    Ranked #24 because of its Google rating and trade focus: 4.8★ from 1,318 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 1,318 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    6094 Franconia Rd # B, Alexandria, VA 22310
    View profile for United Air Temp(703) 762-2488

  25. #25 GW Air Service

    Based in St. Charles, 8 mi away

    61/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.9★ from 270 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 270 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for GW Air Service(240) 601-3041

Top 50 of 969 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 Walker Mill, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26NARFIX HEATING AND AIR CONDITIONING LLC615.0★ (293)11 mi
27AG Services – Electrical, Air Conditioning, Heating & Plumbing614.9★ (440)12 mi
28United Air Temp614.8★ (146)5 mi
29Fixed Right & Guaranteed Super Techs, LLC615.0★ (1,032)19 mi
30ARS / Rescue Rooter604.4★ (3,510)17 mi
31United Air Temp604.4★ (4,301)18 mi
32Bethany Air604.8★ (1,251)18 mi
33Cyprus Air Heating, Cooling and Fireplaces604.3★ (2,189)14 mi
34Beltway Air Conditioning, Heating & Plumbing604.9★ (2,167)23 mi
35JDL HVAC & Plumbing Services604.8★ (678)15 mi
36C.D. Shanahan's HVAC, Plumbing, Electrical & Remodeling LLC604.9★ (966)19 mi
37C&V Home Services Inc604.9★ (114)7 mi
38Mission Comfort605.0★ (625)18 mi
39Logan Mechanical LLC604.7★ (155)7 mi
40A Action Home Services604.9★ (326)14 mi
41Su’Coy Heating, AC & Duct Cleaning604.9★ (64)5 mi
42A-Plus Service Experts604.8★ (1,234)20 mi
43Barstow & Sons Heating and Cooling604.9★ (1,127)21 mi
44McCarthy Services604.4★ (3,547)19 mi
45Narfix Heating and Air Conditioning LLc605.0★ (49)4 mi
46Thomas E Clark Inc604.8★ (299)13 mi
47Tim Whistler Plumbing, Gas Fitting, HVAC, and Electrical604.8★ (291)13 mi
48Cyprus Air Heating, Cooling and Fireplaces604.7★ (1,402)20 mi
49ACCURATE604.9★ (208)13 mi
50McDaniel Service, Inc604.9★ (770)20 mi

How we ranked emergency HVAC contractors in Walker Mill

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 Walker Mill: questions

Which HVAC contractors in Walker Mill are open 24/7?

25 on this list post 24/7 hours, including United Air Temp, Michael & Son Services, Len The Plumber Heating & Air, LLC, Belair Engineering and Service Company, Inc. and United Air Temp.

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

United Air Temp is #1, with a CR Score of 64 out of 100 on emergency weights.

How are emergency HVAC contractors in Walker Mill 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?

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

Update log for Walker Mill

  1. October 2026: CR Scores recalculated for 969 hvac contractors serving Walker Mill.
  2. October 2026: 11 duplicate listings merged.

More emergency and heating and cooling pages