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ContractorsRanked

Best HVAC Contractors in Clarksburg, MD (2026)

617 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Clarksburg: GAC Services, CR Score 94/100; 4.9★ from 6,908 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Presidential, Inc., posts 24/7 hours; ranked #2 of 617.

  3. 28

    Most-reviewed: Len The Plumber Heating & Air, LLC, 8,136 Google reviews at 4.6★, the most of 617 ranked; ranked #28.

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

617 Clarksburg HVAC contractors are ranked here by CR Score, from 8 published factors. 181 are open 24/7, 398 open Saturdays and 284 open Sundays, based on posted hours. The median Google rating is 4.9★ across 617 rated businesses.

Most of this list also appears on the HVAC contractors in Germantown ranking. See HVAC contractors in Germantown

Top 10 HVAC contractors in Clarksburg at a glance

Top 10 HVAC contractors in Clarksburg at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1GAC Services944.9★ (6,908)Gaithersburg, 9 mi away24/7Overall
2Presidential, Inc.924.9★ (1,701)Gaithersburg, 8 mi away24/7Emergencies
3Making Air Right924.9★ (361)Clarksburg24/7—
4Michael Bonsby HVAC, Plumbing & Electrical914.8★ (2,083)Gaithersburg, 8 mi away24/7—
5Parker Pearce Service Experts914.8★ (1,700)Gaithersburg, 8 mi away24/7—
6F.H. Furr Plumbing, Heating, Air Conditioning & Electrical914.7★ (5,985)Rockville, 13 mi away24/7—
7One Hour Air Conditioning & Heating® of Gaithersburg914.8★ (302)Clarksburg24/7—
8Meade's Heating and Air905.0★ (1,428)Sterling, 17 mi away24/7—
9Cardinal Plumbing Heating & Air Inc904.9★ (2,958)Sterling, 19 mi away24/7—
10Cool Breeze Plumbing, Heating & A/C904.8★ (666)Gaithersburg, 8 mi away24/7—

The 617 best HVAC contractors in Clarksburg, 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 Clarksburg

    #1 GAC Services

    Based in Gaithersburg, 9 mi away

    94/100CR 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

  11. #11 M.E. Flow

    Based in Leesburg, 17 mi away

    90/100CR Score

    Ranked #11 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, 19 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

  25. #25 Smock Heating & Air

    Based in Frederick, 12 mi away

    88/100CR Score

    Ranked #25 because of its Google rating and trade focus: 5.0★ from 1,623 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 1,623 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    1539 Tilco Dr Unit 104, Frederick, MD 21704
    View profile for Smock Heating & Air(301) 945-7220

HVAC contractors ranked #28 to #28

#1 to #25 are shown in full above. Here are #28 to #28, in CR Score order; each links to its profile. We publish the top 28 of 617 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Clarksburg, ranks 28 to 28
RankBusinessCR ScoreGoogle ratingDistance
28Len The Plumber Heating & Air, LLC884.6★ (8,136)21 mi

Also serving Clarksburg

1 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 Clarksburg
BusinessGoogle ratingDistance
Vito Services4.7★ (1,351)12 mi

How much do HVAC contractors cost in Clarksburg?

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

How much do HVAC contractors cost in Clarksburg?
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 Clarksburg HVAC contractors

We scored 617 Clarksburg 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 Clarksburg 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 Clarksburg: frequently asked questions

Who is the best HVAC contractor in Clarksburg?

By CR Score, the highest-ranked HVAC contractor in Clarksburg, MD is GAC Services with a CR Score of 94/100. It has 4.9★ from 6,908 Google reviews. It is open 24/7. Presidential, Inc. (#2) and Making Air Right (#3) follow. We ranked 617 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Clarksburg?

ContractorsRanked ranks 617 HVAC contractors serving Clarksburg, MD. 3 of them are based in Clarksburg; the rest serve it from nearby towns. Another 1 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Clarksburg are open 24/7?

181 ranked HVAC contractors in Clarksburg post 24/7 hours. The highest-ranked are GAC Services (#1), Presidential, Inc. (#2) and Making Air Right (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Clarksburg work on weekends?

398 of 617 ranked HVAC contractors post Saturday hours and 284 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), Presidential, Inc. (#2) and Making Air Right (#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 Clarksburg?

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

What Google rating do Clarksburg HVAC contractors have?

The median Google rating among 617 rated HVAC contractors in Clarksburg is 4.9★, with a median of 27 reviews. Len The Plumber Heating & Air, LLC has the most, 8,136 reviews, and ranks #28. 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 Clarksburg?

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 Clarksburg

  1. October 2026: CR Scores recalculated for 617 hvac contractors serving Clarksburg.
  2. October 2026: 1 duplicate listing merged.

More HVAC contractors and Clarksburg pages

Other trades in Clarksburg