LFZ Heating & Cooling
“Laique found the the root of the problem very quickly and suggested different options to go with.”
Best HVAC Contractors in Oshawa, ON
21 companies listed · all 21 in Oshawa · 7 open 24/7 · 14 open weekends · 17 rated 4.5+
Data verified October 21, 2026
Elmridge AIR Comfort
“We have called Elmridge for all of our HVAC issues over the years, using for furnace conversions, replacement installations and A/C repairs.”
Max Comfort Heating & Cooling
“We ended up having a new furnace installed at a fair price and the work was done quickly and professionally.”
KDM Gas
“We were pleasantly surprised when they laid down carpet runners to the mechanical room to avoid damage to our wooden stairs.”
Tracey Refrigeration Heating & Air Conditioning
“They responded to my calls (in the past and most currently, last week), sent the technician to the house and completed the repair on a good timely basis.”
Active Climate Mechanical
“His approach prioritizes repairing equipment over promoting new purchases, showcasing a commitment to sustainable, cost-effective solutions.”
The 21 companies listed for Oshawa, 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: Oshawa, ON
All 21 companies we list here are in Oshawa itself. 19 of the companies on this page have a rating, from 4.3 to 5.0 across 533 reviews; 5 have 50 or more reviews and 17 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (94%), quality (89%) and responsiveness (85%). The topics that come up most in reviews of the companies on this page are "price" and "efficient". 7 are open around the clock; 14 are open on Saturdays and 11 on Sundays. 4 show a licence on their websites. Domain records put 4 websites of the companies on this page at ten or more years old; the oldest dates from 2005. 9 offer emergency call-outs; 2 offer financing or payment plans; 11 give free estimates; 1 is family- or locally-owned and 3 list coupons or special offers. We have a website on file for 19 of the companies on this page; 16 publish a contact page; 14 list a public email and 1 takes 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.
Do any heating firms listed for Oshawa work on Saturdays or Sundays?
Saturday or Sunday hours show up for 14 of the 21 companies on this page. Saturday is mostly repair work; installations land on weekdays, because supply houses and municipal inspectors keep weekday hours.
Comfy Life Heating & Cooling
“Prices are very affordable and I highly recommend them for any HVAC projects.”
Ontario Smart Heating and Cooling Inc
“He was able to fix the problem efficiently and quickly while talking me through the process.”
Mica Energy Solutions Inc.
“The team was very professional recommended what would work in my house.”
Cullen Heating and Air Conditioning Inc.
“They genuinely care about you and tsle care of you like family.”
Brothers Hvac
“Updated us on when he would be arriving and showed up on the time he said he would be coming.”
Oshawa Furnace and A/C Repair
Pure Mechanical Group Inc.
“Technician was there within the hour and had it repaired same day.”
Enviroaire Mechanical & Electrical LTD
416 Heating and Cooling
“My air conditioner was still giving me trouble, so I called again, and the technician arrived immediately and resolved the issue.”
Keep Cool Mechanical
“Corey and his team have delivered quality service time and time again to our aging appliances, while offering tips on how to improve our efficiencies.”
Heat/Cool Depot
“He was honest in diagnosis and kept me informed about the work they are doing.”
Hawkridge Hvac
Comfort Trust Ltd.
“Comfort Trust has been looking after our central heating and air conditioning systems for our residential house and business properties for the last 8 years.”
Durham Hvac
Pro Combustion
Why these companies made our list
What customers say about companies in Oshawa
- “They are knowledgeable, professional, on-time and very reasonably priced for their products and services.” — customer of Comfort Trust Ltd.
- “Matt was able to quickly diagnose the problem, provide a replacement quote right away and was able to install a new furnace the next day.” — customer of Max Comfort Heating & Cooling
- “The team at KDM Gas not only fixed the problem but also took the time to explain everything to me, ensuring I understood what was happening with my furnace.” — customer of KDM Gas
- “Andrew and his team were very professional, efficient, and provided the furnace that best fit my budget and needs.” — customer of Tracey Refrigeration Heating & Air Conditioning
- “Matt answered all my questions around the new furnace and the install and was very efficient and professional.” — customer of Max Comfort Heating & Cooling
Excerpts from public reviews of the companies listed on this page.
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