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ContractorsRanked

Best HVAC Contractors in Herndon, VA (2026)

1,017 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Herndon: Cardinal Plumbing Heating & Air Inc, CR Score 93/100; 4.9★ from 2,958 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): AllTech Services, Inc, posts 24/7 hours; ranked #2 of 1,017.

  3. 12

    Most-reviewed: F.H. Furr Plumbing, Heating, Air Conditioning & Electrical, 17,172 Google reviews at 4.8★, the most of 1,017 ranked; ranked #12.

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

1,017 Herndon HVAC contractors are ranked here by CR Score, from 8 published factors. 318 are open 24/7, 721 open Saturdays and 501 open Sundays, based on posted hours. The median Google rating is 4.9★ across 1,017 rated businesses.

Top 10 HVAC contractors in Herndon at a glance

Top 10 HVAC contractors in Herndon at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Cardinal Plumbing Heating & Air Inc934.9★ (2,958)Sterling, 2 mi away24/7Overall
2AllTech Services, Inc934.9★ (2,807)Sterling, 3 mi away24/7Emergencies
3Snell Home Services934.8★ (5,283)Sterling, 3 mi away24/7—
4Meade's Heating and Air935.0★ (1,428)Sterling, 4 mi away24/7—
5Michael & Son Services924.9★ (1,501)Sterling, 3 mi away24/7—
6Cardinal Plumbing Heating & Air Inc924.9★ (745)Herndon24/7—
7United Air Temp924.8★ (2,161)Sterling, 3 mi away24/7—
8CroppMetcalfe924.8★ (7,638)Fairfax, 10 mi away24/7—
9John Nugent & Sons914.8★ (1,701)Sterling, 4 mi away24/7—
10Premier HVAC LLC915.0★ (230)Herndon24/7—

The 1,017 best HVAC contractors in Herndon, 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.

  7. #7 United Air Temp

    Based in Sterling, 3 mi away

    92/100CR Score

    Ranked #7 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

  8. #8 CroppMetcalfe

    Based in Fairfax, 10 mi away

    92/100CR Score

    Ranked #8 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

  13. #13 GAC Services

    Based in Gaithersburg, 16 mi away

    91/100CR Score

    Ranked #13 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

  20. #20 M.E. Flow

    Based in Leesburg, 12 mi away

    90/100CR Score

    Ranked #20 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

  25. #25 John C. Flood

    Based in Alexandria, 17 mi away

    89/100CR Score

    Ranked #25 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

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 1,017 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Herndon, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26911Air-Care895.0★ (81)In Herndon
27F.H. Furr Plumbing, Heating, Air Conditioning & Electrical894.7★ (5,985)16 mi
28Michael & Son Services894.8★ (993)10 mi
29Sultan Comfort Solutions895.0★ (147)5 mi
30AZA heating, cooling, plumbing & construction895.0★ (959)17 mi
31C.D. Shanahan's HVAC, Plumbing, Electrical & Remodeling LLC894.9★ (966)14 mi
32Krafft Service Corporation884.9★ (1,631)18 mi
33Presidential, Inc.884.9★ (1,701)18 mi
34R A Dobson Inc884.8★ (164)3 mi
35Dave's Heating & Air Conditioning884.8★ (138)2 mi
36Clover Contracting: Plumbing, HVAC & Air Purification884.9★ (156)7 mi
37Fairfax Cooling & Heating Company884.7★ (106)In Herndon
38Making Air Right884.9★ (361)12 mi
39Michael Bonsby HVAC, Plumbing & Electrical884.8★ (2,083)18 mi
40Comfort Defender Heating & Air884.9★ (187)9 mi
41Parker Pearce Service Experts884.8★ (1,700)18 mi
42F.H. Furr Plumbing, Heating, Air Conditioning & Electrical874.7★ (4,469)20 mi
43Air Treatment Heating & Cooling875.0★ (657)8 mi
44Zone Control875.0★ (104)9 mi
45ARS / Rescue Rooter874.5★ (5,934)15 mi
46CroppMetcalfe874.9★ (2,082)24 mi
47Len The Plumber Heating & Air, LLC874.6★ (8,136)20 mi
48Turner's Service Co. Heating & Air Conditioning874.8★ (1,037)17 mi
49Cube Heating & Cooling875.0★ (96)9 mi
50Cyprus Air Heating, Cooling and Fireplaces874.7★ (1,402)15 mi

Also serving Herndon

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 Herndon
BusinessGoogle ratingDistance
Arevalo Twins General ContractorIn Herndon
Argent Heating Cooling and Plumbing4.7★ (392)10 mi
Capozio ServicesIn Herndon
changepro USA1.0★ (2)2 mi
Chesapeake Contracting GroupIn Herndon
H & M HVAC General Construction Inc.5.0★ (2)2 mi
Heating Air Conditioning Repair5.0★ (2)4 mi
Home Services at The Home Depot1.0★ (2)5 mi
Home Services at The Home Depot5.0★ (2)10 mi
HVAC Heroes of Ashburn Co.5.0★ (2)6 mi
K3 Construction Group4.5★ (4)In Herndon
Parrish Services4.8★ (1,816)17 mi
Precision Air Inc5.0★ (2)10 mi
Relax HVAC Inc5.0★ (2)9 mi
Sears Heating and Air Conditioning3.0★ (2)In Herndon
Seneff Heating & Air Inc5.0★ (2)12 mi
Tactical HVACIn Herndon
Tri-State Masters5.0★ (2)7 mi
United Air Temp4.8★ (1,318)18 mi
Vito Services4.7★ (1,351)16 mi

How much do HVAC contractors cost in Herndon?

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

How much do HVAC contractors cost in Herndon?
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 Virginia

In Virginia, Virginia Board for Contractors (DPOR) licenses Contractor license with an HVAC specialty; HVAC technicians hold tradesman licenses.

  1. Search the business name or license number on the Virginia Board for Contractors (DPOR) license lookup.
  2. Check that the status is active and the name matches the contract or truck.
  3. 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 Virginia

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 Herndon HVAC contractors

We scored 1,017 Herndon 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 Herndon 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 Herndon: frequently asked questions

Who is the best HVAC contractor in Herndon?

By CR Score, the highest-ranked HVAC contractor in Herndon, VA is Cardinal Plumbing Heating & Air Inc with a CR Score of 93/100. It has 4.9★ from 2,958 Google reviews. It is open 24/7. AllTech Services, Inc (#2) and Snell Home Services (#3) follow. We ranked 1,017 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Herndon?

ContractorsRanked ranks 1,017 HVAC contractors serving Herndon, VA. 4 of them are based in Herndon; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Herndon are open 24/7?

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

Which HVAC contractors in Herndon work on weekends?

721 of 1,017 ranked HVAC contractors post Saturday hours and 501 post Sunday hours. The highest-ranked open Saturdays are Cardinal Plumbing Heating & Air Inc (#1), AllTech Services, Inc (#2) and Snell Home Services (#3). Posted hours are office hours; crews may book weekend jobs separately.

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

In Virginia, Virginia Board for Contractors (DPOR) handles licensing and covers Contractor license with an HVAC specialty; HVAC technicians hold tradesman licenses. Search the business or license number at https://www.dpor.virginia.gov/LicenseLookup.

How much does ac replacement cost in Herndon?

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

What Google rating do Herndon HVAC contractors have?

The median Google rating among 1,017 rated HVAC contractors in Herndon is 4.9★, with a median of 24 reviews. F.H. Furr Plumbing, Heating, Air Conditioning & Electrical has the most, 17,172 reviews, and ranks #12. 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 Herndon?

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 Herndon

  1. October 2026: CR Scores recalculated for 1,017 hvac contractors serving Herndon.
  2. October 2026: 10 duplicate listings merged.

More HVAC contractors and Herndon pages

Other trades in Herndon