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Emergency HVAC Contractors in Oshawa, ON (2026)

Top 50 of 274 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 Oshawa: Enercare, 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 Oshawa at a glance

Top emergency HVAC contractors in Oshawa at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Enercare954.9★ (8,942)Oshawa24/7
2Reliance Heating, Air Conditioning & Plumbing944.8★ (6,966)Oshawa24/7
3Limcan Certified Heating and Air Conditioning924.8★ (2,979)Ajax, 6 km away24/7
4Joe's Heating and Air Conditioning924.9★ (725)Oshawa24/7
5Ashton Heating & Cooling924.9★ (512)Oshawa24/7
6Limcan Certified Heating and Air Conditioning914.8★ (708)Oshawa24/7
7Daly Home Comfort915.0★ (247)Oshawa24/7
8DC Comfort Air905.0★ (145)Oshawa24/7
9Infiniti Home Comfort904.9★ (417)Ajax, 6 km away24/7
10Button's Heating & Air Conditioning904.9★ (1,570)Pickering, 18 km away24/7

Call an emergency HVAC contractor in Oshawa 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 Oshawa, 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 274 is on the HVAC contractors page.

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 Oshawa

    #1 Enercare

    Based in Oshawa

    95/100CR Score

    Ranked #1 because of its Google rating and availability: 4.9★ from 8,942 Google reviews, open 24/7.

    • 4.9★ from 8,942 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    285 Bloor St W, Oshawa, ON L1J 1R1
    View profile for Enercare(905) 245-2903

  20. #20 AOBUTEC

    Based in Ajax, 8 km away

    88/100CR Score

    Ranked #20 because of its Google rating and availability: 4.9★ from 92 Google reviews, open 24/7.

    • 4.9★ from 92 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    430 Brock St N, Whitby, ON L1N 4H9
    View profile for AOBUTEC(647) 284-4430

  21. #21 Enercare

    Based in Ajax, 31 km away

    88/100CR Score

    Ranked #21 because of its Google rating and availability: 4.8★ from 2,085 Google reviews, open 24/7.

    • 4.8★ from 2,085 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Enercare(289) 372-1037

Top 50 of 274 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 Oshawa, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Reher Air Ltd875.0★ (18)In Oshawa
27Comfort Gurus875.0★ (16)In Oshawa
28Doug Scott Heating and Cooling874.8★ (19)In Oshawa
29Enercare864.8★ (1,563)36 km
30Climate Experts Heating & Cooling Inc.864.7★ (251)19 km
31Eastview Heating and Cooling INC865.0★ (10)In Oshawa
32Max Mechanical - Heating & Air Conditioning864.8★ (34)8 km
33South Service Heating & Air Conditioning Inc.865.0★ (10)In Oshawa
34Boyle Energy Solutions865.0★ (25)In Oshawa
35Comfy Life Heating & Cooling864.6★ (13)In Oshawa
36High Efficiency Cooling & Heating Inc.864.8★ (1,319)39 km
37ICare Home Comfort864.9★ (836)39 km
38Expert Heating & Air Conditioning864.8★ (90)18 km
39Cullen Heating and Air Conditioning Inc.864.3★ (22)In Oshawa
40Superior Plumbing & Heating of Ajax854.7★ (87)16 km
41Fortis Heating & Air Conditioning855.0★ (73)24 km
42HVAC Installs854.8★ (6)In Oshawa
43Plumbing & Heating Heroes854.8★ (114)In Oshawa
44RITE-TEMP Heating and Air Conditioning855.0★ (4)In Oshawa
45Service Express HVAC854.9★ (384)39 km
46Superior Care Home Services Inc.855.0★ (266)40 km
47Hargrave Heating & Air Conditioning854.9★ (366)39 km
48Hatco HVAC854.9★ (53)22 km
49ATK Plumbing and Heating INC.845.0★ (43)In Oshawa
50Just Right Air Systems845.0★ (22)17 km

How we ranked emergency HVAC contractors in Oshawa

Emergency lists move 10 points of the CR Score from reputation to availability: 25% and 20%. 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
Reputation25%Bayesian-adjusted Google star rating
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2
Review volume10%log10(reviews + 1) against the list maximum
Recency10%Share of reviews from the last 12 months
Availability20%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radius
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)

Emergency HVAC contractors in Oshawa: questions

Which HVAC contractors in Oshawa are open 24/7?

25 on this list post 24/7 hours, including Enercare, Reliance Heating, Air Conditioning & Plumbing, Limcan Certified Heating and Air Conditioning, Joe's Heating and Air Conditioning and Ashton Heating & Cooling.

Who is ranked #1 for emergency heating and cooling in Oshawa, ON?

Enercare is #1, with a CR Score of 95 out of 100 on emergency weights.

How are emergency HVAC contractors in Oshawa ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 25% and 20%. 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 Oshawa

  1. October 2026: CR Scores recalculated for 274 hvac contractors serving Oshawa.
  2. October 2026: 2 duplicate listings merged.

More emergency and heating and cooling pages