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Emergency HVAC Contractors in Lexington, MA (2026)

Top 50 of 1,264 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in Lexington: Central Cooling & Heating, open 24/7.

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

Top emergency HVAC contractors in Lexington at a glance

Top emergency HVAC contractors in Lexington at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Central Cooling & Heating664.9★ (3,169)Woburn, 6 mi away24/7
2128 Plumbing, Heating, Cooling & Electric664.9★ (3,912)Wakefield, 9 mi away24/7
3Winters Home Services664.8★ (2,862)Watertown, 6 mi away24/7
4Akian Plumbing, Heating, Cooling & Electric654.8★ (1,625)Watertown, 6 mi away24/7
5Heritage Home Service654.8★ (3,352)Wilmington, 11 mi away24/7
6Addario's Plumbing, Heating, Cooling & Electrical Services644.6★ (2,076)Wilmington, 7 mi away24/7
7Papalia Home Services644.9★ (3,978)Acton, 15 mi away24/7
8MillTown Plumbing, Heating, Cooling and Electrical644.8★ (2,927)Chelmsford, 14 mi away24/7
9HomeServe of New England634.7★ (872)Woburn, 7 mi away24/7
10Cooling Unlimited, Inc.634.8★ (741)Reading, 8 mi away24/7

Call an emergency HVAC contractor in Lexington now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in Lexington, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 1,264 is on the HVAC contractors page.

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

  5. #5 Heritage Home Service

    Based in Wilmington, 11 mi away

    65/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.8★ from 3,352 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 3,352 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    323 Andover St STE 2, Wilmington, MA 01887
    View profile for Heritage Home Service(978) 254-4602

  7. #7 Papalia Home Services

    Based in Acton, 15 mi away

    64/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.9★ from 3,978 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 3,978 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1220 Liberty Square Rd, Boxborough, MA 01719
    View profile for Papalia Home Services(978) 897-1701

  20. #20 Excel Mechanical

    Based in Tewksbury, 9 mi away

    62/100CR Score

    Ranked #20 because of its Google rating and trade focus: 4.8★ from 444 Google reviews, listed on Google as “Air conditioning contractor”.

    • 4.8★ from 444 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2261 Main St, Tewksbury, MA 01876
    View profile for Excel Mechanical(617) 394-1104

  24. #24 KEN's HVAC SERVICE

    Based in Waltham, 3 mi away

    62/100CR Score

    Ranked #24 because of its Google rating and trade focus: 5.0★ from 97 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 97 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    28 College Farm Rd, Waltham, MA 02451
    View profile for KEN's HVAC SERVICE(857) 488-7470

Top 50 of 1,264 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in Lexington, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Super Service Today624.7★ (1,672)17 mi
27Atlantic Heating & Air Conditioning624.8★ (353)10 mi
28Spencer Plumbing Sewer and Drain Cleaning624.9★ (839)16 mi
29Absolute Precision Plumbing, Heating & Cooling624.9★ (491)13 mi
30Comfort Masters HVAC Service614.8★ (112)4 mi
31Denommee Plumbing, HVAC & Electric614.7★ (133)5 mi
32R.H. Young Cooling and Heating, Inc.614.8★ (265)10 mi
33128 Plumbing, Heating, Cooling & Electric615.0★ (562)17 mi
34A&L Plumbing, Heating, and AC Repair614.9★ (169)9 mi
35Green Energy AC Heating & Plumbing Repair614.8★ (44)In Lexington
36Marciano Plumbing & Heating614.9★ (115)7 mi
37Precision Climate Heating & Air Conditioning614.8★ (90)4 mi
38ABV Appliance Service614.8★ (156)8 mi
39All Star Plumbing, Heating and Air Conditioning615.0★ (97)7 mi
40Boston Standard Company614.7★ (2,808)23 mi
41Pann Home Services & Remodeling614.5★ (331)8 mi
42Presidential HVAC614.9★ (206)11 mi
43Landry Mechanical Inc Plumbing HVAC & Electric614.8★ (581)16 mi
44Full Spectrum HVAC Service614.9★ (106)7 mi
45Comfort Masters Heating614.8★ (95)6 mi
46PerfectTemp HVAC Service614.8★ (90)5 mi
47ARS / Rescue Rooter614.6★ (2,547)22 mi
48Christie Cooling and Heating614.8★ (223)11 mi
49Green Energy AC Heating & Plumbing Repair614.8★ (257)12 mi
50Blue Bear Plumbing, Heating & Air614.9★ (234)13 mi

How we ranked emergency HVAC contractors in Lexington

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

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 from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in Lexington: questions

Which HVAC contractors in Lexington are open 24/7?

25 on this list post 24/7 hours, including Central Cooling & Heating, 128 Plumbing, Heating, Cooling & Electric, Winters Home Services, Akian Plumbing, Heating, Cooling & Electric and Heritage Home Service.

Who is ranked #1 for emergency heating and cooling in Lexington, MA?

Central Cooling & Heating is #1, with a CR Score of 66 out of 100 on emergency weights.

How are emergency HVAC contractors in Lexington ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Lexington

  1. October 2026: CR Scores recalculated for 1,264 hvac contractors serving Lexington.
  2. October 2026: 11 duplicate listings merged.

More emergency and heating and cooling pages