Top 25 of 212 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank
25 of the 25 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.
#1 for emergency heating and cooling in Thorold: 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
| Rank | Business | CR Score | Google rating | Based in | Hours |
|---|---|---|---|---|---|
| 1 | Reliance Heating, Air Conditioning & Plumbing | 66 | 4.8★ (2,986) | St. Catharines, 6 km away | 24/7 |
| 2 | Mr. Furnace Heating and Air Conditioning | 66 | 4.8★ (2,672) | St. Catharines, 7 km away | 24/7 |
| 3 | Enercare | 65 | 4.6★ (2,788) | St. Catharines, 9 km away | 24/7 |
| 4 | Evans Heating & Cooling | 64 | 4.8★ (822) | Niagara Falls, 9 km away | 24/7 |
| 5 | MacKay Heating & Cooling | 63 | 4.8★ (349) | St. Catharines, 6 km away | 24/7 |
| 6 | Roy's Plumbing, Heating, Cooling & Electrical | 63 | 4.8★ (3,074) | Tonawanda, 28 km away | 24/7 |
| 7 | Zenner & Ritter Home Services | 63 | 4.9★ (5,592) | Buffalo, 37 km away | 24/7 |
| 8 | T-Mark Plumbing, Heating & Cooling- Buffalo | 63 | 4.9★ (3,978) | Buffalo, 34 km away | 24/7 |
| 9 | Tropical Heating & Cooling - Niagara Falls | 63 | 4.9★ (405) | Niagara Falls, 13 km away | 24/7 |
| 10 | Just Right Heating & Cooling | 62 | 5.0★ (384) | Grand Island, 19 km away | 24/7 |
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.
#1Reliance Heating, Air Conditioning & Plumbing
Open 24/7 · 4.8 from 2,986 Google reviews
#2Mr. Furnace Heating and Air Conditioning
Open 24/7 · 4.8 from 2,672 Google reviews
#3Enercare
Open 24/7 · 4.6 from 2,788 Google reviews
Open 24/7 · 4.8 from 822 Google reviews
Open 24/7 · 4.8 from 349 Google reviews
#6Roy's Plumbing, Heating, Cooling & Electrical
Open 24/7 · 4.8 from 3,074 Google reviews
#7Zenner & Ritter Home Services
Open 24/7 · 4.9 from 5,592 Google reviews
#8T-Mark Plumbing, Heating & Cooling- Buffalo
Open 24/7 · 4.9 from 3,978 Google reviews
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 212 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.
Ranked #1 in Thorold
Based in St. Catharines, 6 km away
Ranked #1 because of its Google rating and trade focus: 4.8★ from 2,986 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Catharines, 7 km away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 2,672 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Catharines, 9 km away
Ranked #3 because of its Google rating and trade focus: 4.6★ from 2,788 Google reviews, listed on Google as “HVAC contractor”.
Based in Niagara Falls, 9 km away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 822 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Catharines, 6 km away
Ranked #5 because of its Google rating and trade focus: 4.8★ from 349 Google reviews, listed on Google as “HVAC contractor”.
Based in Tonawanda, 28 km away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 3,074 Google reviews, listed on Google as “HVAC contractor”.
Based in Buffalo, 37 km away
Ranked #7 because of its Google rating and review volume: 4.9★ from 5,592 Google reviews.
Based in Buffalo, 34 km away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 3,978 Google reviews, listed on Google as “HVAC contractor”.
Based in Niagara Falls, 13 km away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 405 Google reviews, listed on Google as “HVAC contractor”.
Based in Grand Island, 19 km away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 384 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Catharines, 9 km away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 114 Google reviews, listed on Google as “HVAC contractor”.
Based in Amherst, 33 km away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 1,236 Google reviews, listed on Google as “HVAC contractor”.
Based in Niagara Falls, 14 km away
Ranked #13 because of its Google rating and trade focus: 4.8★ from 123 Google reviews, listed on Google as “HVAC contractor”.
Based in Kenmore, 30 km away
Ranked #14 because of its Google rating and trade focus: 4.7★ from 796 Google reviews, listed on Google as “HVAC contractor”.
Based in Niagara Falls, 6 km away
Ranked #15 because of its Google rating and trade focus: 4.6★ from 64 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Catharines, 9 km away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 60 Google reviews, listed on Google as “HVAC contractor”.
Based in Thorold
Ranked #17 because of its Google rating and trade focus: 4.3★ from 39 Google reviews, listed on Google as “Air conditioning contractor”.
Based in Welland, 5 km away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “HVAC contractor”.
Based in Buffalo, 34 km away
Ranked #19 because of its Google rating and trade focus: 4.8★ from 403 Google reviews, listed on Google as “HVAC contractor”.
Based in Thorold
Ranked #20 because of its Google rating and trade focus: 4.1★ from 13 Google reviews, listed on Google as “HVAC contractor”.
Based in Welland, 14 km away
Ranked #21 because of its Google rating and trade focus: 4.6★ from 56 Google reviews, listed on Google as “HVAC contractor”.
Based in Buffalo, 35 km away
Ranked #22 because of its Google rating and trade focus: 4.7★ from 430 Google reviews, listed on Google as “HVAC contractor”.
Based in St. Catharines, 7 km away
Ranked #23 because of its Google rating and trade focus: 4.6★ from 20 Google reviews, listed on Google as “HVAC contractor”.
Based in Niagara Falls, 13 km away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 28 Google reviews, listed on Google as “HVAC contractor”.
Based in Tonawanda, 28 km away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 103 Google reviews, listed on Google as “HVAC contractor”.
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.
| Factor | Weight | Computed from |
|---|---|---|
| Reputation | 15% | Google star rating, adjusted for how many reviews back it |
| Credentials | 15% | Active state license, bond and workers’ comp on file |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list |
| Recency | 5% | Share of reviews from the last 12 months |
| Availability | 15% | Weekly open hours, Saturday, Sunday, 24/7 or same-day |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) |
| Proximity | 5% | Based in the city scores highest, less the farther away it is |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are |