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Best HVAC Contractors in Potomac, MD (2026)

1,110 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Potomac: GAC Services, CR Score 93/100; 4.9★ from 6,908 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): CroppMetcalfe, posts 24/7 hours; ranked #2 of 1,110.

  3. 9

    Most-reviewed: Michael & Son Services, 15,537 Google reviews at 4.7★, the most of 1,110 ranked; ranked #9.

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

1,110 Potomac HVAC contractors are ranked here by CR Score, from 8 published factors. 350 are open 24/7, 752 open Saturdays and 518 open Sundays, based on posted hours. The median Google rating is 4.9★ across 1,110 rated businesses.

Top 10 HVAC contractors in Potomac at a glance

Top 10 HVAC contractors in Potomac at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1GAC Services934.9★ (6,908)Gaithersburg, 8 mi away24/7Overall
2CroppMetcalfe924.8★ (7,638)Fairfax, 10 mi away24/7Emergencies
3F.H. Furr Plumbing, Heating, Air Conditioning & Electrical924.7★ (5,985)Rockville, 7 mi away24/7—
4Meade's Heating and Air915.0★ (1,428)Sterling, 11 mi away24/7—
5Cardinal Plumbing Heating & Air Inc914.9★ (2,958)Sterling, 12 mi away24/7—
6OHA HVAC, Plumbing, Chimney & Fireplaces914.9★ (1,794)Fairfax, 10 mi away24/7—
7AllTech Services, Inc914.9★ (2,807)Sterling, 13 mi away24/7—
8Snell Home Services914.8★ (5,283)Sterling, 13 mi away24/7—
9Michael & Son Services904.7★ (15,537)Alexandria, 16 mi away24/7Most reviews
10Presidential, Inc.904.9★ (1,701)Gaithersburg, 11 mi away24/7—

The 1,110 best HVAC contractors in Potomac, ranked

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.

  1. Ranked #1 in Potomac

    #1 GAC Services

    Based in Gaithersburg, 8 mi away

    93/100CR 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

  2. #2 CroppMetcalfe

    Based in Fairfax, 10 mi away

    92/100CR Score

    Ranked #2 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

  9. #9 Michael & Son Services

    Based in Alexandria, 16 mi away

    90/100CR Score

    Ranked #9 because of its Google rating and review volume: 4.7★ from 15,537 Google reviews, the most Google reviews on this list (15,537).

    • 4.7★ from 15,537 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    5740 General Washington Dr, Alexandria, VA 22312
    View profile for Michael & Son Services(800) 948-6453

  10. #10 Presidential, Inc.

    Based in Gaithersburg, 11 mi away

    90/100CR Score

    Ranked #10 because of its Google rating and availability: 4.9★ from 1,701 Google reviews, open 24/7.

    • 4.9★ from 1,701 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    8000 Cessna Ave, Gaithersburg, MD 20879
    View profile for Presidential, Inc.(301) 719-3315

  13. #13 John C. Flood

    Based in Alexandria, 16 mi away

    90/100CR Score

    Ranked #13 because of its Google rating and availability: 4.8★ from 4,976 Google reviews, open 24/7.

    • 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

  18. #18 United Air Temp

    Based in Sterling, 12 mi away

    90/100CR Score

    Ranked #18 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

HVAC contractors ranked #26 to #50

#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 1,110 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Potomac, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26C.D. Shanahan's HVAC, Plumbing, Electrical & Remodeling LLC894.9★ (966)15 mi
27Making Air Right894.9★ (361)9 mi
28M.E. Flow894.8★ (3,718)19 mi
29Metro Services HVAC884.9★ (298)9 mi
30Air 1 Mechanical Heating and Cooling884.9★ (440)11 mi
31Cool Breeze Plumbing, Heating & A/C884.8★ (666)11 mi
32NARFIX HEATING AND AIR CONDITIONING LLC885.0★ (293)12 mi
33Premier HVAC LLC885.0★ (230)11 mi
34Thomas E Clark Inc884.8★ (299)9 mi
35Michael & Son Services884.7★ (419)7 mi
36Pro Sky Services885.0★ (484)18 mi
37Tim Whistler Plumbing, Gas Fitting, HVAC, and Electrical884.8★ (291)9 mi
38United Air Temp884.8★ (1,318)17 mi
39F.H. Furr Plumbing, Heating, Air Conditioning & Electrical874.7★ (4,469)20 mi
40United Air Temp874.8★ (1,775)19 mi
41Air Treatment Heating & Cooling875.0★ (657)8 mi
42AMS Air Conditioning & Heating874.9★ (116)8 mi
43Caffi Services874.9★ (508)16 mi
44United Air Temp874.8★ (1,306)18 mi
45AG Services – Electrical, Air Conditioning, Heating & Plumbing874.9★ (440)16 mi
46Premier Home Comfort875.0★ (226)15 mi
47ACCURATE874.9★ (208)13 mi
48Argent Heating Cooling and Plumbing874.7★ (392)10 mi
49AVS Heating and Air Conditioning Bethesda - Appliance, Heating, AC Install, Repair Maintenance Service874.8★ (104)6 mi
50EzGreen Air Duct And Dryer Vent Cleaning874.9★ (90)8 mi

Also serving Potomac

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.

Unranked HVAC contractors serving Potomac
BusinessGoogle ratingDistance
A Blessing Mechanical, LLC5.0★ (2)6 mi
Bethesda Refrigeration ServicesIn Potomac
changepro USA1.0★ (2)9 mi
Conrod's Plumbing Heating and A/C5.0★ (2)10 mi
DMV Mechanical3.0★ (2)10 mi
Green HVAC Services5.0★ (2)11 mi
H & M HVAC General Construction Inc.5.0★ (2)9 mi
Helino HVAC Repair Washington5.0★ (2)11 mi
Kensington Cooling & Heating5.0★ (2)7 mi
Maverick Plumbing & HvacIn Potomac
Michael & Son Services4.8★ (993)18 mi
Millies HVAC2.0★ (1)In Potomac
Owens & Johnsons Heating and Cooling3.0★ (2)10 mi
Pavilo HVAC Repair Washington5.0★ (2)11 mi
Precision Air Inc5.0★ (2)11 mi
Rockville Heating & Air Services5.0★ (2)7 mi
S.L. Johnson Plumbing & Heating3.0★ (2)6 mi
Sears Heating and Air Conditioning3.0★ (2)10 mi
Tri-State Masters5.0★ (2)7 mi
Vito Services4.7★ (1,351)7 mi

How much do HVAC contractors cost in Potomac?

National price ranges in USD, not adjusted for Potomac. Each row names its basis and the month we checked it.

How much do HVAC contractors cost in Potomac?
JobLowTypicalHighBasisChecked
AC replacement$3,887$5,978$8,073Per system, installed (unit plus labor); typical range of customer-reported jobs. US national rangeOctober 2026
Furnace replacement$2,823$4,814$6,896Per system, installed; typical range of customer-reported jobs. US national rangeOctober 2026

How to check an HVAC contractor's license in Maryland

In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors licenses Heating, ventilation, air conditioning and refrigeration work.

  1. Check that the status is active and the name matches the contract or truck.
  2. Ask for proof of insurance before work starts.

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

When to hire an HVAC contractor in Maryland

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.

How we ranked Potomac HVAC contractors

We scored 1,110 Potomac 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Potomac data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

HVAC contractors in Potomac: frequently asked questions

Who is the best HVAC contractor in Potomac?

By CR Score, the highest-ranked HVAC contractor in Potomac, MD is GAC Services with a CR Score of 93/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. CroppMetcalfe (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3) follow. We ranked 1,110 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Potomac?

ContractorsRanked ranks 1,110 HVAC contractors serving Potomac, MD. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Potomac are open 24/7?

350 ranked HVAC contractors in Potomac post 24/7 hours. The highest-ranked are GAC Services (#1), CroppMetcalfe (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Potomac work on weekends?

752 of 1,110 ranked HVAC contractors post Saturday hours and 518 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), CroppMetcalfe (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3). Posted hours are office hours; crews may book weekend jobs separately.

How do I check an HVAC contractor's license in Maryland?

In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors handles licensing and covers Heating, ventilation, air conditioning and refrigeration work.

How much does ac replacement cost in Potomac?

AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Potomac. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Potomac HVAC contractors have?

The median Google rating among 1,110 rated HVAC contractors in Potomac is 4.9★, with a median of 24 reviews. Michael & Son Services has the most, 15,537 reviews, and ranks #9. We adjust ratings for review count, so a few five-star reviews cannot top the list.

When is the best time to hire an HVAC contractor in Potomac?

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.

Update log for Potomac

  1. October 2026: CR Scores recalculated for 1,110 hvac contractors serving Potomac.
  2. October 2026: 8 duplicate listings merged.

More HVAC contractors and Potomac pages

Other trades in Potomac