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ContractorsRanked

Best HVAC Contractors in Kemp Mill, MD (2026)

1,173 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Kemp Mill: GAC Services, CR Score 92/100; 4.9★ from 6,908 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Len The Plumber Heating & Air, LLC, posts 24/7 hours; ranked #2 of 1,173.

  3. 8

    Most-reviewed: Michael & Son Services, 15,537 Google reviews at 4.7★, the most of 1,173 ranked; ranked #8.

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

1,173 Kemp Mill HVAC contractors are ranked here by CR Score, from 8 published factors. 345 are open 24/7, 783 open Saturdays and 542 open Sundays, based on posted hours. The median Google rating is 4.8★ across 1,173 rated businesses.

Top 10 HVAC contractors in Kemp Mill at a glance

Top 10 HVAC contractors in Kemp Mill at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1GAC Services924.9★ (6,908)Gaithersburg, 11 mi away24/7Overall
2Len The Plumber Heating & Air, LLC924.6★ (8,136)Silver Spring, 2 mi away24/7Emergencies
3F.H. Furr Plumbing, Heating, Air Conditioning & Electrical914.7★ (5,985)Rockville, 7 mi away24/7—
4NARFIX HEATING AND AIR CONDITIONING LLC915.0★ (293)Silver Spring, 3 mi away24/7—
5CroppMetcalfe904.8★ (7,638)Fairfax, 16 mi away24/7—
6Presidential, Inc.904.9★ (1,701)Gaithersburg, 12 mi away24/7—
7United Air Temp904.8★ (1,306)Greenbelt, 9 mi away24/7—
8Michael & Son Services904.7★ (15,537)Alexandria, 19 mi away24/7Most reviews
9Michael Bonsby HVAC, Plumbing & Electrical904.8★ (2,083)Gaithersburg, 12 mi away24/7—
10Cyprus Air Heating, Cooling and Fireplaces894.7★ (1,402)Rockville, 7 mi away24/7—

The 1,173 best HVAC contractors in Kemp Mill, 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 Kemp Mill

    #1 GAC Services

    Based in Gaithersburg, 11 mi away

    92/100CR 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

  5. #5 CroppMetcalfe

    Based in Fairfax, 16 mi away

    90/100CR Score

    Ranked #5 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

  7. #7 United Air Temp

    Based in Greenbelt, 9 mi away

    90/100CR Score

    Ranked #7 because of its Google rating and availability: 4.8★ from 1,306 Google reviews, open 24/7.

    • 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

  16. #16 John C. Flood

    Based in Alexandria, 18 mi away

    89/100CR Score

    Ranked #16 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

  24. #24 United Air Temp

    Based in Fort Washington, 16 mi away

    88/100CR Score

    Ranked #24 because of its Google rating and availability: 4.8★ from 1,775 Google reviews, open 24/7.

    • 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

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 1,173 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Kemp Mill, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Grove Heating & Cooling884.9★ (1,156)18 mi
27One Hour Air Conditioning & Heating® of Gaithersburg884.8★ (302)8 mi
28Cool Breeze Plumbing, Heating & A/C884.8★ (666)12 mi
29AllTech Services, Inc884.9★ (2,807)23 mi
30AMS Air Conditioning & Heating884.9★ (116)5 mi
31Shemtov Systems Heating & Air Conditioning884.9★ (57)1 mi
32Snell Home Services884.8★ (5,283)23 mi
33Cycle Heating and Cooling, LLC884.9★ (77)3 mi
34Metro Services HVAC884.9★ (298)12 mi
35Caffi Services874.9★ (508)15 mi
36C.D. Shanahan's HVAC, Plumbing, Electrical & Remodeling LLC874.9★ (966)19 mi
37Michael & Son Services874.9★ (1,501)22 mi
38Nelson's HVAC, LLC874.9★ (627)17 mi
39Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical874.8★ (4,514)24 mi
40Service Force Plumbing874.9★ (374)2 mi
41EzGreen Air Duct And Dryer Vent Cleaning874.9★ (90)6 mi
42Su' Coy Heating, AC & Duct Cleaning874.9★ (205)11 mi
43Zapata’s HVAC Systems874.9★ (107)3 mi
44Magnolia Plumbing, Heating & Cooling874.4★ (1,519)6 mi
45Nero's Heating and Air874.9★ (166)10 mi
46United Air Temp874.8★ (1,318)19 mi
47AG Services – Electrical, Air Conditioning, Heating & Plumbing874.9★ (440)16 mi
48AVS Heating and Air Conditioning Bethesda - Appliance, Heating, AC Install, Repair Maintenance Service874.8★ (104)6 mi
49United Air Temp874.8★ (2,161)22 mi
50Cardinal Plumbing Heating & Air Inc874.9★ (745)20 mi

Also serving Kemp Mill

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 Kemp Mill
BusinessGoogle ratingDistance
Barivo HVAC Repair Washington5.0★ (2)10 mi
Bill Myers Inc4.5★ (2)8 mi
Conrod's Plumbing Heating and A/C5.0★ (2)3 mi
Coreno HVAC Repair Washington5.0★ (2)10 mi
DMV Mechanical3.0★ (2)3 mi
Energy Systems Inc3.0★ (2)3 mi
Helino HVAC Repair Washington5.0★ (2)10 mi
Heravo HVAC Repair Washington5.0★ (2)9 mi
JC & JC HVAC4.7★ (503)5 mi
JDL HVAC & Plumbing Services4.8★ (678)9 mi
Kensington Cooling & Heating5.0★ (2)3 mi
Owens & Johnsons Heating and Cooling3.0★ (2)5 mi
Pavilo HVAC Repair Washington5.0★ (2)10 mi
R And R Climate Control Inc5.0★ (2)4 mi
R D Springer Plumbing & Heating5.0★ (2)3 mi
S.L. Johnson Plumbing & Heating3.0★ (2)8 mi
T & T Plumbing And Heating5.0★ (2)8 mi
Teravo HVAC Repair Washington5.0★ (2)9 mi
Vito Services4.7★ (1,351)8 mi
Xavino HVAC Repair Washington5.0★ (2)10 mi

How much do HVAC contractors cost in Kemp Mill?

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

How much do HVAC contractors cost in Kemp Mill?
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 Kemp Mill HVAC contractors

We scored 1,173 Kemp Mill 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 Kemp Mill 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 Kemp Mill: frequently asked questions

Who is the best HVAC contractor in Kemp Mill?

By CR Score, the highest-ranked HVAC contractor in Kemp Mill, MD is GAC Services with a CR Score of 92/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. Len The Plumber Heating & Air, LLC (#2) and F.H. Furr Plumbing, Heating, Air Conditioning & Electrical (#3) follow. We ranked 1,173 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Kemp Mill?

ContractorsRanked ranks 1,173 HVAC contractors serving Kemp Mill, MD. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

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

345 ranked HVAC contractors in Kemp Mill post 24/7 hours. The highest-ranked are GAC Services (#1), Len The Plumber Heating & Air, LLC (#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 Kemp Mill work on weekends?

783 of 1,173 ranked HVAC contractors post Saturday hours and 542 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), Len The Plumber Heating & Air, LLC (#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 Kemp Mill?

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 Kemp Mill. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Kemp Mill HVAC contractors have?

The median Google rating among 1,173 rated HVAC contractors in Kemp Mill is 4.8★, with a median of 22 reviews. Michael & Son Services has the most, 15,537 reviews, and ranks #8. 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 Kemp Mill?

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 Kemp Mill

  1. October 2026: CR Scores recalculated for 1,173 hvac contractors serving Kemp Mill.
  2. October 2026: 11 duplicate listings merged.

More HVAC contractors and Kemp Mill pages

Other trades in Kemp Mill