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Emergency HVAC Contractors in Markham, ON (2026)

Top 50 of 813 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 Markham: Reliance Heating, Air Conditioning & Plumbing, 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 Markham at a glance

Top emergency HVAC contractors in Markham at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Reliance Heating, Air Conditioning & Plumbing664.9★ (10,870)Richmond Hill, 10 km away24/7
2Reliance Heating, Air Conditioning & Plumbing654.7★ (9,158)North York, 11 km away24/7
3Go Lime654.8★ (6,512)North York, 12 km away24/7
4High Efficiency Cooling & Heating Inc.644.8★ (1,319)Markham24/7
5ICare Home Comfort644.9★ (836)Markham24/7
6Mersey Heating and Air Conditioning644.8★ (3,715)Scarborough, 10 km away24/7
7Enercare644.8★ (11,186)North York, 23 km away24/7
8Constant Home Comfort634.8★ (583)Markham24/7
9Enercare634.9★ (9,609)Vaughan, 25 km away24/7
10Aire One Heating & Cooling634.8★ (480)Markham24/7

Call an emergency HVAC contractor in Markham 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 Markham, 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 813 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.

  3. #3 Go Lime

    Based in North York, 12 km away

    65/100CR Score

    Ranked #3 because of its Google rating and trade focus: 4.8★ from 6,512 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 6,512 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    2225 Sheppard Ave E, North York, ON M2J 5C2
    View profile for Go Lime(877) 747-8292

  5. #5 ICare Home Comfort

    Based in Markham

    64/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.9★ from 836 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 836 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1001 Denison St Unit 1-2, Markham, ON L3R 2Z6
    View profile for ICare Home Comfort(905) 399-9888

  7. #7 Enercare

    Based in North York, 23 km away

    64/100CR Score

    Ranked #7 because of its Google rating and trade focus: 4.8★ from 11,186 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 11,186 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    37 Dufflaw Rd, North York, ON M6A 2W2
    View profile for Enercare(416) 640-1206

  9. #9 Enercare

    Based in Vaughan, 25 km away

    63/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.9★ from 9,609 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 9,609 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    261 Trowers Rd, Vaughan, ON L4L 5Z8
    View profile for Enercare(905) 266-0219

  13. #13 Royal Air Solutions

    Based in Markham

    63/100CR Score

    Ranked #13 because of its Google rating and trade focus: 5.0★ from 271 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 271 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    168 Steeles Ave E, Markham, ON L3T 1A5
    View profile for Royal Air Solutions(416) 827-1916

  15. #15 Enercare

    Based in Ajax, 13 km away

    63/100CR Score

    Ranked #15 because of its Google rating and trade focus: 4.8★ from 2,085 Google reviews, listed on Google as “HVAC contractor”.

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

  20. #20 Enercare

    Based in Oshawa, 32 km away

    62/100CR Score

    Ranked #20 because of its Google rating and trade focus: 4.9★ from 8,942 Google reviews, listed on Google as “HVAC contractor”.

    • 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

  23. #23 Smile HVAC

    Based in Vaughan, 20 km away

    62/100CR Score

    Ranked #23 because of its Google rating and trade focus: 5.0★ from 1,314 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 1,314 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    8540 Keele St Unit 41, Vaughan, ON L4K 2A6
    View profile for Smile HVAC(437) 777-4555

Top 50 of 813 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 Markham, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Econoair Heating & Cooling Inc624.9★ (435)10 km
27HVAC Trust624.9★ (465)11 km
28Reliance Heating, Air Conditioning & Plumbing624.8★ (6,966)31 km
29Summers and Smith Cooling & Heating Limited624.9★ (1,559)21 km
30LG Home Comfort624.6★ (2,421)19 km
31Exalted Services624.9★ (100)In Markham
32Enercare614.8★ (1,154)19 km
33Enercare614.7★ (1,470)19 km
34HVAC Near Me614.9★ (83)In Markham
35Enercare614.9★ (4,281)33 km
36Limcan Certified Heating and Air Conditioning614.8★ (2,979)28 km
37Epsilon Mechanical615.0★ (61)In Markham
38Maple Air - Heating, Cooling & Electrical614.8★ (1,309)22 km
39Air Point Heating & Cooling615.0★ (431)18 km
40AeroFusion Heating & Cooling615.0★ (52)In Markham
41High Heat Gas Services615.0★ (53)In Markham
42Home Trade Standards - Condo HVAC Specialists615.0★ (464)21 km
43Reliance Heating, Air Conditioning & Plumbing614.7★ (1,854)26 km
44AccuServ Heating and Air Conditioning604.9★ (490)20 km
45Affordable Climate Solutions605.0★ (165)13 km
46Empower Home Comfort604.8★ (546)19 km
47Superior Plumbing & Heating of Markham604.9★ (44)In Markham
48Bay Tech Heating and Cooling605.0★ (223)16 km
49Martino HVAC604.7★ (631)19 km
50United Home Services Centre Inc. (联合冷暖)604.7★ (55)In Markham

How we ranked emergency HVAC contractors in Markham

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 Markham: questions

Which HVAC contractors in Markham are open 24/7?

25 on this list post 24/7 hours, including Reliance Heating, Air Conditioning & Plumbing, Reliance Heating, Air Conditioning & Plumbing, Go Lime, High Efficiency Cooling & Heating Inc. and ICare Home Comfort.

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

Reliance Heating, Air Conditioning & Plumbing is #1, with a CR Score of 66 out of 100 on emergency weights.

How are emergency HVAC contractors in Markham 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 Markham

  1. October 2026: CR Scores recalculated for 813 hvac contractors serving Markham.
  2. October 2026: 3 duplicate listings merged.

More emergency and heating and cooling pages