Danlex Gas
“Danny was professional, kind and explained what was going on each step of the way.”
Best HVAC Contractors near Dundas, ON
2 of these companies are based in Dundas; the others serve Dundas from towns including Oakville, Hamilton and Toronto.
12 open 24/7 · 20 open weekends · 23 rated 4.5+ · 7 show a licence
Data verified October 18, 2026
Express Heating and Cooling
“I recently had the pleasure of working with Express Heating and Cooling for the installation of a new furnace and water boiler in my home, and I couldn't be more satisfied with the experience.”
MHC Home Comfort
“MHC has been servicing my air conditioner and furnace for years and I've never had any issues with them.”
LB Heating & Air Conditioning Co.
“They came on time, with the right parts, were clean and efficient”
Smith Heating & Cooling
“Not only did he perform a well-needed maintenance on the a/c and furnace he also fixed our very loud furnace so that it is nice and quiet - what a difference!”
Hvac Canada Limited
“I highly recommend this business,Laith finished his business in professional way , answering all questions in honesty way , after all he stands behind his work”
The 24 companies listed for Dundas, 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: Dundas, ON
The 24 companies on this page are rated from 4.1 to 5.0 across 8,359 reviews; 18 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 (92%), quality (84%) and responsiveness (81%). The topics that come up most in reviews of the companies on this page are "efficient", "cleanliness" and "price". 12 are open around the clock; 20 are open on Saturdays and 14 on Sundays. 7 show a licence on their websites and 1 lists staff certifications (NATE). 9 have ten or more years of experience, the longest 20 years. 16 offer emergency call-outs; 10 offer financing or payment plans; 15 give free estimates; 5 are family- or locally-owned and 14 list coupons or special offers. We have a website on file for all 24 of the companies on this page; 22 publish a contact page; 18 list a public email and 3 take bookings online. 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 Dundas answer no-heat calls at night?
Round the clock cover is stated in 12 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.
Toronto Radon Removal
“They even put down mats/blankets in the house to keep the floors clean.”
Excel Heating and Air Conditioning
“He called before he arrived and he was thorough, professional, knowledgeable, and he fixed the Venmar HRV.”
Radiant Sole
“We have been really impressed with the quality of their work and highly recommend Radiant Sole for all your in-floor heating projects!”
Dynamic Heating & Cooling
“Barrett was spot on and helped with a couple of small things that needed to be done.”
Hamco Heating and Cooling Ltd.
“I can't thank Nolan, Jordan, Veronika and the rest of the team at Hamco enough for caring, going the extra mile and helping me out of a real jam.”
Shipton's Heating & Cooling Ltd
“I am quite happy with the interaction and service from the Shipton Team.”
Precision Hvac Mech Inc
“Precision's technician took the time to investigate the problem and fix the issue which turned out to be more complicated.”
A1 Air Conditioning & Heating
“Rich V and Randy M were very professional and answered any questions I had.”
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Spurr Heating & Air Conditioning
“I called at 5 pm and by 630 pm Spencer arrived did some troubleshooting and found that the fan is not working in the furnace .”
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Canadian Heating and Air Conditioning Inc.
“Great service they provided a quick fix then suggested the Air conditioner is old and needed replacing and worked with a great price for me”
Crystal Heating and Cooling
“Had our furnace repaired by them and when I contacted Debbie they came the same day.”
Appleby Systems
“David O'Neil did a fantastic job installing my automated gas fire controller.”
Aire One Heating & Cooling
“Aire One was great installing our Carrier air conditioner today, excellent service, service men were very professional and did a good job, we have dealt with this company for many years, highly recommend them.”
Abbey Air Home Services by Enercare
“He also made a point to inspect our furnace, water heater and thermostat to make sure all was in working order.”
Eco Standard Hvac Heating & Cooling Repair and Maintenance
“Adam came over the next day, assessed the situation and fixed the issue - honest, no hassle and kept me well informed.”
Airtemp Hvac Furnace and Air Conditioner
“The technician, Ridvan who helped us was so friendly, professional and explained everything to us so we could make the appropriate decision regarding our HVAC needs.”
Hearth & Home
“This guy was as professional as they come and super friendly and on time.”
B & G Heating & Cooling
“Neil guided us to find the best product for our household needs and got the appointment scheduled promptly.”
Why these companies made our list
What customers say about companies near Dundas
- “Technician ANDREW serviced my furnace today. Highly knowledgeable, honest, cheerful, professional and customer service oriented.” — customer of Appleby Systems
- “They were professional, prompt, tidy and friendly. Highly recommend this company for all your needs!” — customer of A1 Air Conditioning & Heating
- “They were professional through both the sales process and the installation, and showed integrity with their communication and scheduling.” — customer of B & G Heating & Cooling
- “We just had our annual furnace maintenance. Juan Martinez is a very friendly, thorough and professional technician.” — customer of Crystal Heating and Cooling
- “Needed repair service for our furnace over the weekend and received excellent professional service.” — customer of Airtemp Hvac Furnace and Air Conditioner
Excerpts from public reviews of the companies listed on this page.
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