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Mackay Heating & Cooling
“I highly recommend Mackay Heating and Cooling, the technicians and staff are very helpful and take the time to help you understand the work to be done.”
Best HVAC Contractors in St. Catharines, ON
15 companies listed · 12 in St. Catharines · 4 open 24/7 · 9 open weekends · all 15 rated 4.5+
Data verified October 19, 2026
Brian Easton Hvac
“From the initial phone call to coming to our home to service our heat pump, they were professional and explained what they were doing in addition to things we could do for maintenance ourselves.”
Mr. Furnace Heating and Air Conditioning
“He repaired things as best he could to make it safe and arranged for a consultation the next day to assist in moving forward in fixing/replacing the true problem.”
Boyko's Heating and Air Conditioning
“They are vey good at all aspects of their work and very well priced too !!”
JJM Heating and Cooling
“Everything was great from start to finish, they were friendly, thorough and professional, no complaints!”
Greentech Niagara Inc
“GreenTech sized the equipment and planned the install in advance (ie: where to run the lines; how to mount the units).”
The 15 companies listed for St. Catharines, ON handle furnaces and heat pumps in winter and the cooling side in summer. Profiles repeat what each firm publishes about hours, licensing and brands, with ratings and review quotes gathered from public reviews.
Area overview: St. Catharines, ON
12 of the 15 companies we list are based in St. Catharines; the other 3 serve St. Catharines from Thorold (6 km), Fenwick (16 km) and Niagara Falls (17 km). The companies on this page are rated from 4.6 to 5.0 across 3,212 reviews; 6 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (89%), responsiveness (87%) and quality (83%). The topics that come up most in reviews of the companies on this page are "price", "informative" and "efficient". 4 are open around the clock; 8 are open on Saturdays and 8 on Sundays. 1 shows a licence on its website. Domain records put 5 websites of the companies on this page at ten or more years old; the oldest dates from 1998. 5 offer emergency call-outs; 2 offer financing or payment plans; 3 give free estimates; 4 are family- or locally-owned and 1 lists coupons or special offers. We have a website on file for 13 of the companies on this page; 12 publish a contact page and 9 list a public email. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Which companies listed for St. Catharines answer no-heat calls at night?
Round the clock cover is stated in 4 of the 15 listings here. On a winter night that call is worth making early, because a house left without heat can freeze pipes before morning. Expect a temporary fix and a return visit once parts are available.
Modern Mechanical Plumbing & Heating
“My husband Ken and I have been working with Tony and Modern Mechanical for years, and they've always been excellent in responding to our calls quickly and addressing any problem at hand.”
Penn Refrigeration Ltd
“Jared did a wonderful job installing our heat/air unit at Pay2Day.”
Heatech Mechanical
“Super professional, knew what they were talking about and exactly what needed to be done to our super old dinosaur of a furnace.”
Regional Mechanical (Niagara) Inc.
Marz Heating & Cooling Inc.
“Marlene and his team were great, did the job on time and as quoted with no surprises on my end.”
M & S Heating Service Inc
“Thank you Jay and Melissa for excellent service on my oil burning furnace.”
Evans Heating & Cooling
“Very comforting experience to contact Evans Heating and Cooling, the gentle man who was assigned to do my residential job was a very pleasant personality, helping and skilled, Very professional and reasonable company.”
Performance Heating & Air Inc.
“My ac is old and he did his best to fix it and hoping it will last me the rest of the summer.”
Marty's Heating and Air Conditioning
“The techs were amazing and friendly and went above and beyond to fix the problem.”
Why these companies made our list
What customers say about companies in St. Catharines
- “Marlon was extremely professional. From the day we contacted him for a quote to the day of installation he was responsive and always willing to answer any question.” — customer of Marz Heating & Cooling Inc.
- “Fast, reliable and friendly team doing a good job to help us with our air conditioner.” — customer of JJM Heating and Cooling
- “Great customer service. Answered my question, and gave my furnace a cleaning.” — customer of Mr. Furnace Heating and Air Conditioning
Excerpts from public reviews of the companies listed on this page.
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