Skip to content
ContractorsRanked

Emergency HVAC Contractors in St. Catharines, ON (2026)

Top 50 of 190 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 St. Catharines: 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 St. Catharines at a glance

Top emergency HVAC contractors in St. Catharines at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Reliance Heating, Air Conditioning & Plumbing684.8★ (2,986)St. Catharines24/7
2Mr. Furnace Heating and Air Conditioning674.8★ (2,672)St. Catharines24/7
3Enercare674.6★ (2,788)St. Catharines24/7
4MacKay Heating & Cooling644.8★ (349)St. Catharines24/7
5Evans Heating & Cooling634.8★ (822)Niagara Falls, 14 km away24/7
6MarZ Heating & Cooling Inc.635.0★ (114)St. Catharines24/7
7Roy's Plumbing, Heating, Cooling & Electrical624.8★ (3,074)Tonawanda, 34 km away24/7
8T-Mark Plumbing, Heating & Cooling- Buffalo624.9★ (3,978)Buffalo, 40 km away24/7
9Tropical Heating & Cooling - Niagara Falls624.9★ (405)Niagara Falls, 18 km away24/7
10Superior Plumbing & Heating of St. Catharines624.9★ (60)St. Catharines24/7

Call an emergency HVAC contractor in St. Catharines 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 St. Catharines, 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 190 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 Enercare

    Based in St. Catharines

    67/100CR Score

    Ranked #3 because of its Google rating and trade focus: 4.6★ from 2,788 Google reviews, listed on Google as “HVAC contractor”.

    • 4.6★ from 2,788 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    30 Hannover Dr, St. Catharines, ON L2W 1A3
    View profile for Enercare(905) 225-1107

  15. #15 Niagara Home Heating

    Based in Niagara Falls, 20 km away

    60/100CR Score

    Ranked #15 because of its Google rating and trade focus: 4.8★ from 123 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 123 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    4436 Shuttleworth Dr, Niagara Falls, ON L2G 0X5
    View profile for Niagara Home Heating(289) 228-2688

  22. #22 Hamilton Home Comfort

    Based in Burlington, 37 km away

    59/100CR Score

    Ranked #22 because of its Google rating and trade focus: 4.8★ from 353 Google reviews, listed on Google as “HVAC contractor”.

    • 4.8★ from 353 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    335 Fruitland Rd, Stoney Creek, ON L8E 5M8
    View profile for Hamilton Home Comfort(905) 643-0981

Top 50 of 190 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 St. Catharines, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Carlton 5 Mechanical Services584.1★ (13)7 km
27Evolution Heating & Air Conditioning585.0★ (103)34 km
28H.W. Bryk and Sons584.3★ (75)21 km
29R. J. Dippold HomeWorks INC Heating and Air584.9★ (63)28 km
30Allen Heating and Cooling574.8★ (18)16 km
31CN Heating & Cooling575.0★ (12)14 km
32Sure-Fix Service Group Inc.573.7★ (53)14 km
33Lane Refrigeration • Niagara Region575.0★ (11)14 km
34Volpatti Mechanical575.0★ (17)19 km
35Erie Niagara Heating and Cooling575.0★ (38)29 km
36Holley Home Comfort565.0★ (53)35 km
37S L Heating Inc563.8★ (5)10 km
38Thermal Comfort Solutions Heating and Cooling565.0★ (38)33 km
39GORDON HOME SERVICES564.8★ (34)30 km
40Plumr Plumbing & Heating564.9★ (121)20 km
41MGD Mechanical564.3★ (6)14 km
42D. H. Berry Inc.564.5★ (66)34 km
43Air Masters Heating And Cooling565.0★ (9)21 km
44Greg's Plumbing and Heating Inc.565.0★ (5)16 km
45The Enviro-Niagara Group564.3★ (96)35 km
46Military Mechanical, Plumbing - Heating - Cooling564.9★ (50)39 km
47Hamilton Air Systems Inc554.9★ (35)36 km
48HOT WATER GUY554.0★ (4)14 km
49Niagara Home Heating555.0★ (3)14 km
50Mario Palmer Heating and Cooling Inc555.0★ (3)15 km

How we ranked emergency HVAC contractors in St. Catharines

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 St. Catharines: questions

Which HVAC contractors in St. Catharines are open 24/7?

25 on this list post 24/7 hours, including Reliance Heating, Air Conditioning & Plumbing, Mr. Furnace Heating and Air Conditioning, Enercare, MacKay Heating & Cooling and Evans Heating & Cooling.

Who is ranked #1 for emergency heating and cooling in St. Catharines, ON?

Reliance Heating, Air Conditioning & Plumbing is #1, with a CR Score of 68 out of 100 on emergency weights.

How are emergency HVAC contractors in St. Catharines 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 St. Catharines

  1. October 2026: CR Scores recalculated for 190 hvac contractors serving St. Catharines.

More emergency and heating and cooling pages