Allam Heating & Cooling Ltd
“James took the time to diagnose and explain the issue with our a/c unit.”
Best HVAC Contractors in Thunder Bay, ON
9 companies listed · all 9 in Thunder Bay · 4 open 24/7 · 7 open weekends · 6 rated 4.5+
Data verified October 16, 2026
We are still growing
There are too few quality options within 25 km, so we have expanded area of coverage to up to 100 km from you. This includes Thunder Bay and several other cities.
LDR Heating & Cooling
“Helped me over the phone and gave me free advice to fix furnace.”
Buhler Mechanical Service
“Jonah spotted a leak where the water shut off valve is for the house and I was told the next day by the plumber that it could have flooded the basement, had it not been caught.”
Klīmit Mechanical Ltd
“The A/C unit including the installation was priced very reasonable and they are local.”
Thermal Mechanical Systems Inc.
“Explains what needs to be fixed and how they can fix it before they do the work.”
ACR Mechanical Ltd
“Doesn't try to get you to buy more work than you need.”
The 9 companies listed for Thunder Bay, 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: Thunder Bay, ON
All 9 companies we list here are in Thunder Bay itself. The companies on this page are rated from 3.7 to 5.0 across 143 reviews; 6 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (95%), punctuality (86%) and quality (84%). 4 are open around the clock; 6 are open on Saturdays and 6 on Sundays. 3 have ten or more years of experience, the longest 24 years. 4 offer emergency call-outs; 1 offers financing or payment plans and 3 are family- or locally-owned. We have a website on file for 7 of the companies on this page; 6 publish a contact page and 5 list a public email. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Which companies listed for Thunder Bay answer no-heat calls at night?
Round the clock cover is stated in 4 of the 9 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.
Economy Heating Svc
“Excellent service and extremely efficient with locating the issue with our furnace, obtaining the part and installing it.”
Ward's Heating & Mechanical
“They did work that I didn't expect such as installing my fire place that I thought I needed to hire another company.”
Smart Comfort Heating & Cooling
“They were extremely professional and explained what they were doing and why, they went on to explain the units thoroughly.”
Why these companies made our list
What customers say about companies in Thunder Bay
- “James was great from start to finish. He was very professional and easy to deal with and was flexible with scheduling.” — customer of Allam Heating & Cooling Ltd
- “They were punctual, knowledgeable and most importantly left my house impeccably clean after the work.” — customer of Buhler Mechanical Service
- “Great service and competitive prices. I had a furnace break down and this company was quick to complete a new install and went out of their way to accommodate us.” — customer of Klīmit Mechanical Ltd
- “James was great ! Always showed up when he said he would and did high quality work.” — customer of Allam Heating & Cooling Ltd
Excerpts from public reviews of the companies listed on this page.
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