Comfort Heating & Air Conditioning
“Came very quickly, was very honest and helpful replacing and installing a humidifier for our furnace”
Best HVAC Contractors in Keswick, ON
24 companies listed · 4 in Keswick · 16 open 24/7 · 19 open weekends · 23 rated 4.5+
Data verified October 21, 2026
Central Heating & Cooling Co.
“One happy customer here, Wayne and his team did a great job replacing our furnace and water heater.”
Briggs Plumbing & Heating Ltd
“When the inspector came by to do the final inspection for the gas furnace he asked me to be sure to let the installer know what a nice job they did.”
Ryan Shorten Heat + Cool
“The next day got the parts and was repaired with in Less then 24 hours of my initial call.”
Hanley's Plumbing
“They were efficient, professional and friendly as well as being reasonably priced.”
Black Forest Plumbing Inc
“Great service , Josh came to my house very professional , on time and found the problem quick and got it fixed right away.”
The 24 companies listed for Keswick, 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: Keswick, ON
4 of the 24 companies we list are based in Keswick; the other 20 serve Keswick from towns including Barrie (21 km), Newmarket (22 km) and Innisfil Beach (10 km). The companies on this page are rated from 4.4 to 5.0 across 3,828 reviews; 19 have 50 or more reviews and 23 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), responsiveness (81%) and quality (78%). The topics that come up most in reviews of the companies on this page are "efficient", "price" and "cleanliness". 16 are open around the clock; 19 are open on Saturdays and 18 on Sundays. The services the companies on this page list most often on their websites are air conditioners (3), furnaces (3), indoor air quality (3), water heaters (3) and boilers (2). 5 show a licence on their websites. 9 have ten or more years of experience, the longest 30 years. 19 offer emergency call-outs; 9 offer financing or payment plans; 9 give free estimates; 6 are family- or locally-owned and 10 list 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.
Which companies listed for Keswick answer no-heat calls at night?
Round the clock cover is stated in 16 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.
Affordable Comfort
“He did everything to help us and get a solution as soon as possible.”
A Plus Heating & Air Conditioning
“I used A+ to replace my hot water tank - they were so good with their work and pricing that I also replaced my furnace and ac with them.”
Barrie Heating & Air Conditioning
“He was super informative about what we need to do to care for our HVAC system and came with positive friendly energy despite an early morning visit in bad weather.”
Affordable Reliable Climate Control Mechanical
“Called this awesome company to fix my A/C and within an hour I had someone here!”
Air Source Home Comfort
“They did the job very thoroughly, answered all my questions and were very professional.”
Everest Climate Solutions Inc.
“The installation team, consisting of two skilled technicians, worked efficiently and were extremely respectful of my home.”
Custom Comfort Climatecare
“Both Brandy and Aaron provided excellent customer service and Aaron was very thorough, efficient and knowledgeable when fixing my furnace and ensuring my family's safety.”
Aire One North
“He was like a teacher, explained everything in detail, walked me through why & how things work, showed me all the tests and maintenance work he did, identified the problem...”
Lafontaine Mechanical
“Amazing company, amazing people, a pleasure to deal with them regarding any issues that come up.”
M.a.c. Stewart Plumbing
“Mark's sewage pump installation was efficient and professional.”
Infiniti Air Conditioning & Heating
“Great and quick service when I needed it and super friendly technicians.”
Optimal Air Solutions Inc
“Very polite and respectful and communicates everything and makes sure the problem is solved.”
Canco Climatecare
“The sales advisor provided great advice and recommendations for the installation and product selection.”
Georgian Home Comfort
“From Evan explaining the cost of AC unit to contract he was very thorough.”
North Wind Heating & Air Conditioning
“We have been using his services for a few years now, every time a great experience.”
Doctor Appliance Heating & Cooling
“Was able to offer services for a plumber on a Sunday; excellent work”
Air Care Quality Comfort
“Jimmy and his crew were great , none the less awesome work all around, very friendly and good work ethic...”
Aire One Heating & Cooling Inc
“Although I was faced with a heat emergency during the winter months, they did not take advantage of my situation and were all wonderful to deal with.”
Why these companies made our list
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