MN Mechanical
“Top notch service by the technician and great customer service by the gentleman who helped me on the phone.”
Best HVAC Contractors in Sarnia, ON
10 companies listed · 4 in Sarnia · 1 open 24/7 · 3 open weekends · 6 rated 4.5+
Data verified October 19, 2026
W J Barnes
“Super friendly and helpful, had a new hot water heater installed in less than 24 hours from calling for a quote.”
Abram Heating & Cooling
“It was a quick response to a faulty water heater, which we are extremely thankful for.”
Marks Comfort Tech
“Rob and his buddy came promptly, was quick on their job, friendly and even gave tips on related things I was unaware.”
ASM
“These guys showed up and did their job as discussed and were awesome to have work with.”
Lambton Climate Care
“Have used Lambton Climate Care a few times for service work over past few years - always top-notch service and fair pricing!”
The 10 companies listed for Sarnia, 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: Sarnia, ON
4 of the 10 companies we list are based in Sarnia; the other 6 serve Sarnia from towns including Arkona (38 km), Point Edward (8 km) and Petrolia (18 km). 9 of the companies on this page have a rating, from 4.1 to 5.0 across 312 reviews; 3 have 50 or more reviews and 6 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (84%), quality (82%) and responsiveness (76%). The topics that come up most in reviews of the companies on this page are "price" and "estimates". 1 is open around the clock and 3 are open on weekends. 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 1997. 5 offer emergency call-outs; 5 offer financing or payment plans; 4 give free estimates; 3 are family- or locally-owned and 1 lists coupons or special offers. 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.
Why do some of these firms show another city?
4 of the 10 companies have an address in Sarnia; the rest come from other towns within 45 km. Crews drive to the job, so the address matters less than whether they answer calls in your area in winter.
Mid-Lam Heating and Cooling
“The Midlam Team did an awesome job replacing it (it took a large team of strong guys to get it up to the bedroom & take the old one away)”
Taylor's Heating & Air Conditioning
“We were very happy with their service and when they left, everything was left as it was when they got here.”
Jon Vaughan Heating and Cooling
AAA Complete Heat
“You wouldn't have known they had been there with the amazing clean up that followed once they were done.”
Why these companies made our list
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