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Airzone Hvac Services
“Starting with Max who did the service call, the install team who replaced my furnace and everyone at the office.”
Best HVAC Contractors in Ottawa, ON
23 companies listed · all 23 in Ottawa · 13 open 24/7 · 17 open weekends · 22 rated 4.5+
Data verified October 21, 2026
JD Swallow Heating & Cooling
“Always great service on time, professional and great staff, I am always satisfied with their service and many of my neighbors.”
Kovar Contracting Inc.
“They were obsessed about getting the job done right, and performed every aspect of their work with very high standards.”
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Zenith Eco Energy
“He left me with a complete check list and some advice on how to improve efficiency.”
Parent Heating & Cooling
“I have used Parent Heating & Cooling for maintenance of furnaces at rental properties and always found them to be efficient, on time and provide advice”
Ottawa Home Services
“I also wish to add that when I call OHS everyone is always courteous and friendly.”
The 23 companies listed for Ottawa, 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: Ottawa, ON
All 23 companies we list here are in Ottawa itself. We have 51 companies in Ottawa on file; this page shows the highest-rated 23. The companies on this page are rated from 4.3 to 5.0 across 13,682 reviews; all 23 have 50 or more reviews and 22 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (90%), quality (82%) and responsiveness (76%). The topics that come up most in reviews of the companies on this page are "efficient", "cleanliness" and "price". 13 are open around the clock; 17 are open on Saturdays and 15 on Sundays. The services the companies on this page list most often on their websites are water heaters (6), heating (5), air conditioning (3), boilers (3) and cooling (3). 3 show a licence on their websites. 11 have ten or more years of experience, the longest 28 years. 14 offer emergency call-outs; 8 offer financing or payment plans; 9 give free estimates; 5 are family- or locally-owned and 9 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 Ottawa answer no-heat calls at night?
Round the clock cover is stated in 13 of the 23 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.
Equal Air Heating Cooling Air Conditioning
“Top notch service, I have started using them for my properties for service calls and I am very pleased with how they operate.”
Oria Heating and Cooling
“There were some hiccups with the unit at the beginning on the season, but Mansoor was incredibly responsive and got the unit replaced within a week of identifying the issue.”
True North Mechanical
“Quick to respond, thoroughly explained issues in layman's terms, professional, courteous, no rush and no pressure to make decisions.”
MR Home Comfort Heating and Cooling Inc.
“We'll definitely continue using MR Home Comfort for our heating and cooling needs and would happily recommend them to others”
Ottawa Comfort Heating & Cooling
“Aaron was great deal to with, very responsive and determined in tracking down and resolving my HVAC issues.”
First Call Heating & Cooling Inc.
“They were wonderful to work with and greatly helped us when we lost our furnace and hot water heater.”
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Capital City Heating and Cooling Inc.
“I was impressed and will have Capital City do my annual maintenance of all my HVAC components in future.”
Ambassador Dearie Hvac
“They deserve to be complimented for a job well done and for being a positive representation for this HVAC business.”
Rick Menard Heating & Cooling
“The service was done in timely fashion and professionally and I trust their work, comments and review.”
J.C. Robinson & Sons Ltd.
“Excellent service, Tech arrived on time, performed the annual service, Tech very knowledgeable on the furnace.”
Gentech
“The professional team and service staff exemplify outstanding customer care, demonstrating courtesy, efficiency, and dedication throughout the entire experience.”
Harry's Home Comfort
“The installer Ali Zaidi, very happy with his service installing the heat pump.”
Pro Duct Solutions
“Zac (the owner) was incredibly helpful, and quickly booked us in for an inspection and then ultimately the replacement of our unit”
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Rogers Heating and Air Conditioning Inc
“Very good service and always arrive on time and do thorough work on furnace maintenance.”
Weatherfix Hvac Inc
“Replaced my oil furnace for a gas furnace + new AC in less than a week.”
Anchor Home Comfort
“Tech came on Sunday afternoon within a few hours to check on our old, 15 years gas water heater.”
Bobby's Hvac Services Etc
“After some supply chain issues were resolved, Bob and his team took care of our gas fireplace insert with ease.”
Why these companies made our list
What customers say about companies in Ottawa
- “Robert was professional, very knowledgeable and took the time to communicate clearly with me about my furnace.” — customer of JD Swallow Heating & Cooling
- “What a great company. Your installation employees were professional, courteous, honest and knowledgeable.” — customer of Capital City Heating and Cooling Inc.
- “Extremely professional, efficient and thorough company. Both Aaron and Cody were great to communicate with and very responsive to coming to repair my furnace.” — customer of Ottawa Comfort Heating & Cooling
- “They recommended a heat pump that perfectly suits my requirements, and their transparency in explaining the features and benefits made me feel confident in my choice.” — customer of Harry's Home Comfort
- “Great customer service, timely responses. The team and tech went above and beyond to help us get our furnace back up and running on a cold winter day!” — customer of Oria Heating and Cooling
Excerpts from public reviews of the companies listed on this page.
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