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ContractorsRanked

Best HVAC Contractors in Darnestown, MD (2026)

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

The short answer

  1. 1

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

  2. 2

    Best for emergencies (open 24/7): Meade's Heating and Air, posts 24/7 hours; ranked #2 of 981.

  3. 26

    Most-reviewed: Michael & Son Services, 15,537 Google reviews at 4.7★, the most of 981 ranked; ranked #26.

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

981 Darnestown HVAC contractors are ranked here by CR Score, from 8 published factors. 293 are open 24/7, 658 open Saturdays and 466 open Sundays, based on posted hours. The median Google rating is 4.9★ across 981 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 Darnestown at a glance

Top 10 HVAC contractors in Darnestown at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1GAC Services944.9★ (6,908)Gaithersburg, 6 mi away24/7Overall
2Meade's Heating and Air925.0★ (1,428)Sterling, 9 mi away24/7Emergencies
3Cardinal Plumbing Heating & Air Inc914.9★ (2,958)Sterling, 10 mi away24/7—
4Presidential, Inc.914.9★ (1,701)Gaithersburg, 8 mi away24/7—
5F.H. Furr Plumbing, Heating, Air Conditioning & Electrical914.7★ (5,985)Rockville, 8 mi away24/7—
6AllTech Services, Inc914.9★ (2,807)Sterling, 12 mi away24/7—
7Snell Home Services914.8★ (5,283)Sterling, 12 mi away24/7—
8Conde Tech Services, LLC915.0★ (166)Darnestown24/7—
9Michael & Son Services914.9★ (1,501)Sterling, 9 mi away24/7—
10Making Air Right914.9★ (361)Clarksburg, 2 mi away24/7—

The 981 best HVAC contractors in Darnestown, 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 Darnestown

    #1 GAC Services

    Based in Gaithersburg, 6 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

  13. #13 CroppMetcalfe

    Based in Fairfax, 16 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

  16. #16 M.E. Flow

    Based in Leesburg, 13 mi away

    90/100CR Score

    Ranked #16 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

  18. #18 United Air Temp

    Based in Sterling, 11 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 #27

#1 to #25 are shown in full above. Here are #26 to #27, in CR Score order; each links to its profile. We publish the top 27 of 981 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Darnestown, ranks 26 to 27
RankBusinessCR ScoreGoogle ratingDistance
26Michael & Son Services894.7★ (15,537)22 mi
27Len The Plumber Heating & Air, LLC894.6★ (8,136)16 mi

Also serving Darnestown

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 Darnestown
BusinessGoogle ratingDistance
Vito Services4.7★ (1,351)8 mi

How much do HVAC contractors cost in Darnestown?

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

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

We scored 981 Darnestown 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 Darnestown 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 Darnestown: frequently asked questions

Who is the best HVAC contractor in Darnestown?

By CR Score, the highest-ranked HVAC contractor in Darnestown, 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. Meade's Heating and Air (#2) and Cardinal Plumbing Heating & Air Inc (#3) follow. We ranked 981 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Darnestown?

ContractorsRanked ranks 981 HVAC contractors serving Darnestown, MD. 1 of them is based in Darnestown; 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 Darnestown are open 24/7?

293 ranked HVAC contractors in Darnestown post 24/7 hours. The highest-ranked are GAC Services (#1), Meade's Heating and Air (#2) and Cardinal Plumbing Heating & Air Inc (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Darnestown work on weekends?

658 of 981 ranked HVAC contractors post Saturday hours and 466 post Sunday hours. The highest-ranked open Saturdays are GAC Services (#1), Meade's Heating and Air (#2) and Cardinal Plumbing Heating & Air Inc (#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 Darnestown?

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

What Google rating do Darnestown HVAC contractors have?

The median Google rating among 981 rated HVAC contractors in Darnestown is 4.9★, with a median of 24 reviews. Michael & Son Services has the most, 15,537 reviews, and ranks #26. 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 Darnestown?

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 Darnestown

  1. October 2026: CR Scores recalculated for 981 hvac contractors serving Darnestown.
  2. October 2026: 7 duplicate listings merged.

More HVAC contractors and Darnestown pages

Other trades in Darnestown