Sarman Air Inc.
“My friend introduced Sarman Air to us and they are very professional ,on time and detail oriented, I highly recommend 👌 …”
Best HVAC Contractors in Thornhill, ON
24 companies listed · 10 in Thornhill · 15 open 24/7 · 21 open weekends · 23 rated 4.5+
Data verified October 21, 2026
Green Approved Solutions
“We had a minor leak at a connection point after the install and their response was very fast and got fixed.”
Airland Hvac
“Bunch of professional who did a great job installing the until and left no mess behind , would def recommend”
Prestige Air Heating & Cooling
“They passed inspection with flying colors and you don't have to worry about not knowing it, they will do the right thing the first time.”
Eminate Hvac Design
“They took the extra work to call the inspector to make sure everything wa done properly.”
Hvac Contractors Ltd
“I highly recommend this company, they have great service, best price, flexible ways to fix the problem, amazing customer service, I wish I could give 6 stars ⭐️”
The 24 companies listed for Thornhill, 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: Thornhill, ON
10 of the 24 companies we list are based in Thornhill; the other 14 serve Thornhill from towns including Mississauga, Vaughan and Richmond Hill. 23 of the companies on this page have a rating, from 4.7 to 5.0 across 4,815 reviews; 16 have 50 or more reviews. When customers rate these companies on specific qualities, they most often praise professionalism (89%), responsiveness (82%) and quality (80%). The topics that come up most in reviews of the companies on this page are "efficient", "estimates" and "price". 15 are open around the clock; 21 are open on Saturdays and 20 on Sundays. The services the companies on this page list most often on their websites are duct cleaning (4), heating (4), cooling (3), heat pumps (3) and water heaters (3). 8 show a licence on their websites. 6 have ten or more years of experience, the longest 25 years. 16 offer emergency call-outs; 7 offer financing or payment plans; 14 give free estimates; 7 are family- or locally-owned and 12 list coupons or special offers. 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 Thornhill answer no-heat calls at night?
Round the clock cover is stated in 15 of the 24 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.
Air Comfort Ontario Ltd.
Air Trust Heating and Cooling Inc.
“Ali is a dedicated professional who is knowledgeable, meticulous and detail oriented.”
Heated Way
Boreal Heating & Air Conditioning Inc
Energy Home Service
“Excellent service, specially person over call and Ahmed, the technician, were very professional, humble and provided clean job.”
Evam Canada Inc.
“I recently needed a certificate for my furnace after a house inspection, and Ed from Evam Canada made the process incredibly easy.”
Econoair Heating & Cooling Inc
“This company provides a professional service and really cares about its clients.”
Longhouse Electric
“Knowledgeable and willing to give the best advice for the situation you are in.”
Smile Hvac
“He went above and beyond ensuring our problem was fixed promptly and well.”
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City Home Comfort
“Shawn is fantastic, very knowledgable and takes the time explaining what you're buying before you buy it.”
Empower Home Comfort
“Very happy with the service and strongly recommend to anyone who is looking for their services.”
Cozy World Inc.
“You took my call, came on the same day to prep for the work, then just removed old & replaced new the next day exactly as what we discussed”
Air Connect Heating & Cooling
“Jay gave me a great experience when replacing my AC, I was hesitant at first due to bad experiences in the past but I highly recommend him to anyone thinking of getting this type of work done!”
Summers and Smith Cooling & Heating Limited
“He was very patient with my questions and changing my mind about what I wanted, sending me 4 different proposals throughout my decision process.”
Energy Clean Heating and Air Systems
“He listened to my requests carefully and responded very clearly and respectfully.”
Air Point Heating & Cooling
“I also had few issues with Furnace which they took care of very professionally and very fair priced”
Furnace King Home Services
“During the recent torrential down pour they thoughtfully rolled out a rubber mat through out the house to protect our floors and carpeting.”
Breezecome Home Service/Quality Breeze 清风到家 服务到家
“Team install my tankless WH today the technician are great, they even spend some extra time to check my AC I highly recommend this company”
Why these companies made our list
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