HVAC Contractors in St. Catharines
14 HVAC contractors in St. Catharines with multi-platform trust scores.
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Who is the best HVAC contractor in St. Catharines, Ontario?
The highest-scoring HVAC contractors in St. Catharines on ProScore are MarZ Heating & Cooling Inc. (75/100), Reliance Heating, Air Conditioning & Plumbing (74/100) and Ozone Climate (70/100). ProScore has scored 14 HVAC contractors in St. Catharines across 10+ data sources and 20+ trust signals. 3 of the 14 are Trusted-tier (70+) or higher.
Star ratings alone do not separate them: 8 of the 14 average 4.5 stars or higher on Google, but only 3 reach Trusted (70+). ProScore also weighs government licensing including TSSA, WSIB coverage, ratings on other platforms and what customers say in their reviews.
Trust scores last computed October 13, 2026.
Which HVAC contractors in St. Catharines score highest?
All 14 scored hvac contractors in St. Catharines, ranked by ProScore.
ProScore scores 14 hvac contractors in St. Catharines, and their average score is 53 out of 100. 3 of them reach the Trusted threshold of 70 or higher. 1 is registered with WSIB and 2 hold a TSSA licence. 14 have Google reviews on file — 3,376 reviews in total, and 3 carry a Better Business Bureau rating. Across Ontario, 29% of the HVAC contractors ProScore has scored reach the Trusted threshold; at 21%, St. Catharines is below the provincial rate.
MarZ Heating & Cooling Inc. provides HVAC repairs and installations in St. Catharines, available 24/7.
MarZ Heating & Cooling Inc. ranks 1st of the 14 hvac contractors ProScore scores in St. Catharines, holding a ProScore of 75 out of 100 (Trusted tier). Its score draws on 115 Google reviews averaging 5.0 out of 5 and a Better Business Bureau rating of A+. Public records show it is licensed by the TSSA.
Reliance Heating, Air Conditioning & Plumbing ranks 2nd of the 14 hvac contractors ProScore scores in St. Catharines, holding a ProScore of 74 out of 100 (Trusted tier). Its score draws on 3,011 Google reviews averaging 4.8 out of 5 and a Better Business Bureau rating of A+.
Ozone Climate serves the St. Catharines area in HVAC and water heating, operating six days a week.
Ozone Climate ranks 3rd of the 14 hvac contractors ProScore scores in St. Catharines, holding a ProScore of 70 out of 100 (Trusted tier). Its score draws on 64 Google reviews averaging 5.0 out of 5 and 20 reviews on other major review platforms.
Superior HVAC Service handles furnace repair and replacement in St. Catharines, working by appointment seven days a week with same-day service available for emergency calls. Technicians provide detailed explanations of system issues and run thorough diagnostics before completing work.
The ProScore for Superior HVAC Service, Heating & Air Conditioning draws on 64 Google reviews averaging 4.9 out of 5.
Group 92 Mechanical Inc. is an HVAC contractor based in St. Catharines, operating weekdays with wheelchair-accessible parking.
The ProScore for Group 92 Mechanical Inc. draws on 4 Google reviews averaging 4.0 out of 5. Public records show Group 92 Mechanical Inc. is licensed by the TSSA.
J & S Heating And Air Conditioning operates weekdays in St. Catharines, with on-site free parking and flexible payment options including cheques and debit.
The ProScore for J & S Heating And Air Conditioning draws on 53 Google reviews averaging 3.1 out of 5.
JJM Heating and Cooling provides HVAC services in St. Catharines and is open six days a week.
The ProScore for JJM Heating and Cooling draws on 29 Google reviews averaging 4.9 out of 5.
The ProScore for Guenther Heating & Air Conditioning Ltd. draws on 20 Google reviews averaging 4.9 out of 5.
The ProScore for AIR 1 HEATING AND COOLING draws on 6 Google reviews averaging 4.3 out of 5.
The ProScore for Regional Mechanical (Niagara) Inc. draws on 1 Google review averaging 5.0 out of 5.
Heatech Mechanical is an HVAC contractor operating seven days a week from St. Catharines, with wheelchair-accessible parking.
The ProScore for Heatech Mechanical draws on 2 Google reviews averaging 3.0 out of 5 and a Better Business Bureau rating of A+.
The ProScore for Filomar Contracting draws on 3 Google reviews averaging 3.7 out of 5. Public records show Filomar Contracting is registered with WSIB.
Wolf Mechanical provides HVAC services in St. Catharines, Ontario and offers wheelchair-accessible parking.
The ProScore for Wolf Mechanical draws on 2 Google reviews averaging 5.0 out of 5.
The ProScore for EAS Heating & Air Cond draws on 2 Google reviews averaging 2.5 out of 5.
How is an HVAC contractor's ProScore calculated?
Every HVAC contractor in St. Catharines is evaluated across four pillars: Reputation (ratings across multiple platforms), Verification (government licensing including TSSA and WSIB), Transparency (online presence and profile completeness), and Sentiment (AI analysis of customer reviews). The result is a ProScore from 0 to 100.
Read the full methodology →Who are the top 3 HVAC contractors in St. Catharines?
What else should I check before hiring hvac contractors in St. Catharines?
Frequently Asked Questions
Who is the best HVAC contractor in St. Catharines?
MarZ Heating & Cooling Inc. has the highest ProScore (75/100) among 14 HVAC contractors in St. Catharines, Ontario. Rankings are based on ProScore, which evaluates ratings, government licensing (TSSA), WSIB coverage, and AI-analyzed customer sentiment.
How do I find a trustworthy HVAC contractor in St. Catharines?
Look for hvac contractors with verified TSSA licensing, active WSIB coverage, and consistent ratings across multiple platforms. ProScore aggregates these signals into a single score from 0-100. In St. Catharines, 0 hvac contractors hold Elite-tier ProScores (81+), 3 are Trusted-tier (70+), and 5 are Good-tier (54+).
Are hvac contractors in St. Catharines licensed?
Gas and fuel work in Ontario must be done by a TSSA-registered contractor using certified technicians. Ask for the registration number and check it with the TSSA. Of the top 14 hvac contractors in St. Catharines by ProScore, 2 hold a TSSA registration according to ProScore’s records. Of the top 14 hvac contractors in St. Catharines by ProScore, 1 is registered with WSIB according to ProScore’s records.
How many hvac contractors has ProScore scored in St. Catharines?
ProScore has scored 14 hvac contractors in St. Catharines, Ontario. Each provider is evaluated using 10+ data sources, 20+ trust signals, and AI-analyzed customer reviews. Trust scores last computed October 13, 2026.
What's the ProScore distribution among hvac contractors in St. Catharines?
Among 14 hvac contractors in St. Catharines, Ontario: 0 are Elite-tier (81+), 3 are Trusted-tier (70+), and 5 are Good-tier (54+). Together they average a ProScore of 53/100, with MarZ Heating & Cooling Inc. leading at 75/100.
How do HVAC contractors in St. Catharines compare with Ontario as a whole?
21% of the HVAC contractors ProScore has scored in St. Catharines reach the Trusted tier (70+), against 29% across Ontario as a whole, so St. Catharines is below the provincial rate.
HVAC Contractors near St. Catharines
The nearest Ontario cities with a ProScore page for this trade — a pro based nearby may cover your area.
Other trades in St. Catharines
Other trades with a ProScore page in St. Catharines, with the number of scored pros in each.