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Best HVAC Contractors in Darien, CT (2026)

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

The short answer

  1. 1

    Best overall in Darien: Astacio Heating, Cooling, Plumbing & Electrical, CR Score 63/100; 4.8★ from 1,998 Google reviews; open 7 days a week.

  2. 2

    Best for emergencies (open 24/7): Air Solutions, Inc., posts 24/7 hours; ranked #2 of 871.

  3. 6

    Most-reviewed: Universe Home Services, 6,771 Google reviews at 4.8★, the most of 871 ranked; ranked #6.

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

871 Darien HVAC contractors are ranked here by CR Score, from ten published factors. 271 are open 24/7, 500 open Saturdays and 360 open Sundays, based on posted hours. The median Google rating is 4.8★ across 871 rated businesses.

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

Top 10 HVAC contractors in Darien at a glance

Top 10 HVAC contractors in Darien at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Astacio Heating, Cooling, Plumbing & Electrical634.8★ (1,998)Norwalk, 4 mi awaySat · Sun · EveningsOverall
2Air Solutions, Inc.634.8★ (718)Stamford, 5 mi away24/7Emergencies
3Servco Oil & Propane635.0★ (133)Darien24/7—
4EXTRAVE Heating & Cooling635.0★ (209)Stamford, 3 mi away24/7—
5ENCON Heating and Air Conditioning624.9★ (211)Stamford, 3 mi away24/7—
6Universe Home Services624.8★ (6,771)Farmingdale, 23 mi away24/7Most reviews
7Sila Heating, Air Conditioning, Plumbing & Electrical624.8★ (1,821)White Plains, 16 mi away24/7—
8Green Mechanicals Heating & Cooling LLC624.8★ (179)Stamford, 3 mi away24/7—
9Tragar Home Services624.9★ (3,757)Hicksville, 23 mi away24/7—
10FAIRCONN Plumbing And Heating LLC625.0★ (101)Stamford, 3 mi away24/7—

The 871 best HVAC contractors in Darien, ranked

Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  2. #2 Air Solutions, Inc.

    Based in Stamford, 5 mi away

    63/100CR Score

    Ranked #2 because of its Google rating and trade focus: 4.8★ from 718 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 718 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    430 Fairfield Ave, Stamford, CT 06902
    View profile for Air Solutions, Inc.(203) 357-8853

  9. #9 Tragar Home Services

    Based in Hicksville, 23 mi away

    62/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.9★ from 3,757 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 3,757 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    3 Washington Pkwy, Hicksville, NY 11801
    View profile for Tragar Home Services(516) 980-3839

  11. #11 Bruni & Campisi, Inc.

    Based in Greenburgh, 18 mi away

    61/100CR Score

    Ranked #11 because of its Google rating and trade focus: 4.7★ from 3,366 Google reviews, listed on Google as “HVAC contractor”.

    • 4.7★ from 3,366 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    100 Grasslands Rd, Elmsford, NY 10523
    View profile for Bruni & Campisi, Inc.(914) 734-5557

  14. #14 AMHAC

    Based in Eastchester, 20 mi away

    61/100CR Score

    Ranked #14 because of its Google rating and trade focus: 4.9★ from 1,440 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 1,440 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    365 White Plains Rd, Eastchester, NY 10709
    View profile for AMHAC(914) 337-5555

  18. #18 Yost & Campbell

    Based in Bronxville, 22 mi away

    61/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.8★ from 2,459 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 2,459 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    20 Brookdale Pl, Mt Vernon, NY 10550
    View profile for Yost & Campbell(914) 901-3813

  19. #19 Robison

    Based in Port Chester, 12 mi away

    60/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.5★ from 1,257 Google reviews, listed on Google as “HVAC contractor”.

    • 4.5★ from 1,257 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    One Gateway Plaza 4th floor, Port Chester, NY 10573
    View profile for Robison(914) 345-5700

  20. #20 HVAC Specialist Inc

    Based in Greenburgh, 17 mi away

    60/100CR Score

    Ranked #20 because of its Google rating and trade focus: 4.9★ from 549 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 549 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    8 Sunset Pl, Hawthorne, NY 10532
    View profile for HVAC Specialist Inc(914) 666-7667

  21. #21 Royal Comfort

    Based in Port Chester, 11 mi away

    60/100CR Score

    Ranked #21 because of its Google rating and trade focus: 4.9★ from 199 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 199 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    70 Putnam Ave, Port Chester, NY 10573
    View profile for Royal Comfort(914) 299-8600

  23. #23 Climate Care, LLC

    Based in Norwalk, 5 mi away

    60/100CR Score

    Ranked #23 because of its Google rating and trade focus: 4.6★ from 171 Google reviews, listed on Google as “HVAC contractor”.

    • 4.6★ from 171 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    318 Strawberry Hill Ave, Norwalk, CT 06851
    View profile for Climate Care, LLC(203) 354-2020

HVAC contractors ranked #27 to #28

#1 to #25 are shown in full above. Here are #27 to #28, in CR Score order; each links to its profile. We publish the top 28 of 871 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Darien, ranks 27 to 28
RankBusinessCR ScoreGoogle ratingDistance
27Evolution Air, LLC604.9★ (60)5 mi
28Celco Heating & Air Conditioning604.7★ (861)18 mi

How much do HVAC contractors cost in Darien?

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

How much do HVAC contractors cost in Darien?
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 Connecticut

In Connecticut, Connecticut Department of Consumer Protection licenses Heating, piping, cooling and sheet metal licenses.

  1. Search the business name or license number on the Connecticut Department of Consumer Protection 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 Connecticut

In Connecticut, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.

How we ranked Darien HVAC contractors

We scored 871 Darien HVAC contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Darien data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

HVAC contractors in Darien: frequently asked questions

Who is the best HVAC contractor in Darien?

By CR Score, the highest-ranked HVAC contractor in Darien, CT is Astacio Heating, Cooling, Plumbing & Electrical with a CR Score of 63/100. It has 4.8★ from 1,998 Google reviews. It is open 7 days a week. Air Solutions, Inc. (#2) and Servco Oil & Propane (#3) follow. We ranked 871 HVAC contractors on ten factors, last updated October 22, 2026.

How many HVAC contractors are there in Darien?

ContractorsRanked ranks 871 HVAC contractors serving Darien, CT. 2 of them are based in Darien; the rest serve it from nearby towns. Counts are as of October 2026.

Which HVAC contractors in Darien are open 24/7?

271 ranked HVAC contractors in Darien post 24/7 hours. The highest-ranked are Air Solutions, Inc. (#2), Servco Oil & Propane (#3) and EXTRAVE Heating & Cooling (#4). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Darien work on weekends?

500 of 871 ranked HVAC contractors post Saturday hours and 360 post Sunday hours. The highest-ranked open Saturdays are Astacio Heating, Cooling, Plumbing & Electrical (#1), Air Solutions, Inc. (#2) and Servco Oil & Propane (#3). Posted hours are office hours; crews may book weekend jobs separately.

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

In Connecticut, Connecticut Department of Consumer Protection handles licensing and covers Heating, piping, cooling and sheet metal licenses. Search the business or license number at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx.

How much does ac replacement cost in Darien?

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

What Google rating do Darien HVAC contractors have?

The median Google rating among 871 rated HVAC contractors in Darien is 4.8★, with a median of 17 reviews. Universe Home Services has the most, 6,771 reviews, and ranks #6. 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 Darien?

In Connecticut, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.

Update log for Darien

  1. October 2026: CR Scores recalculated for 871 hvac contractors serving Darien.
  2. October 2026: 4 duplicate listings merged.

More HVAC contractors and Darien pages

Other trades in Darien