Saint Thomas, ON

Popular Cities

Saint Thomas, ON
Join as a Pro

Best HVAC Contractors in St. Thomas, ON

15 companies listed · 8 in St. Thomas · 5 open 24/7 · 8 open weekends · 14 rated 4.5+

Data verified October 18, 2026

Abode Home Comfort

Abode Home Comfort

5.0 130 reviews
“Amazing quote, very reasonable and my wife and I were very pleased overall with the cost including installation, the overall professionalism & service provided.”
Free estimatesServes London, St. ThomasMaintenance plans from $12.99/moOpen 24 hoursSince 2022Financing
107 Gaylord Rd
FAQs
My AC is frozen what should I do?
Never run the AC when it is frozen. Turn it off, make sure there is nothing restricting the airflow (filter plugged) wait for it to thaw, and have a professional come out to diagnose why it is freezing up.
Should the fan run all the time or be on auto?
It is recommended that the fan run all of the time to keep more consistent temperature throughout the home. In new equipment the fans are designed to run all of the time and the fan speed will automatically drop when not heating or cooling.
How can I fix inconsistent temperatures throughout the house?
We recommend installing modulating or variable capacity equipment. This equipment always adjusts itself to the demand of the temperature outside and will give you a more consistent temperature throughout the home.
What is the biggest advantage to having a smart thermostat?
The biggest advantage of having a smart thermostat is that when you are not home and there is an issue, it will notify you and depending on what smart thermostat you have it can even notify your dealer, and thus greatly reducing the risk of property damage.
This information can be found on the FAQ page on our website.
i
Gastech Solutions Inc.

Gastech Solutions Inc.

4.9 134 reviews
“We had a productive interchange on placement of the equipment inside and outside to accommodate my inclinations, particularly to hide the main electrical conduit with AV cable sheathing (my idea) which Ryan was very cheerfully creative in applying.”
Free consultationOpen 24 hoursSince 2007
45 Progress Dr
i
County Lines Hvac & Fireplaces

County Lines Hvac & Fireplaces

5.0 97 reviews
“We would like to thank Andrew and his team for their professionalism, education, demeanor, timeliness and overall their passion to help customers”
Family-owned
43 Ross St
i
G.w.b Heating & Cooling

G.w.b Heating & Cooling

5.0 129 reviews
“Highly recommend, installers were amazing, courteous and even put rugs down to go through the house.”
Open 24 hoursSince 2010Financing
6500 Sunset Dr
i
TK Heating and Cooling Inc

TK Heating and Cooling Inc

5.0 53 reviews
“They came out right away and diagnosed the problem and arranged their schedule to get a new one up and running right away.”
Free consultationEmergency service
16 Barrie Blvd
i
Cam's Heating & Air Cond Inc

Cam's Heating & Air Cond Inc

4.8 32 reviews
“Dominic was utterly professional and was very knowledgeable he found and fixed the issue right away under warranty.”
Since 2011
24 Spackman Blvd
i

The 15 companies listed for St. Thomas, 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: St. Thomas, ON

8 of the 15 companies we list are based in St. Thomas; the other 7 serve St. Thomas from London (24 km). The companies on this page are rated from 4.0 to 5.0 across 8,161 reviews; 12 have 50 or more reviews and 14 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (90%), responsiveness (67%) and punctuality (66%). The topics that come up most in reviews of the companies on this page are "efficient", "cleanliness" and "informative". 5 are open around the clock; 8 are open on Saturdays and 5 on Sundays. The services the companies on this page list most often on their websites are cooling (2), heating (2), indoor air quality (2) and water heaters (2). 3 show a licence on their websites. 6 have ten or more years of experience, the longest 22 years. 6 offer emergency call-outs; 4 offer financing or payment plans; 6 give free estimates; 5 are family- or locally-owned and 6 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.

Do any heating firms listed for St. Thomas work on Saturdays or Sundays?

Saturday or Sunday hours show up for 8 of the 15 companies on this page. Saturday is mostly repair work; installations land on weekdays, because supply houses and municipal inspectors keep weekday hours.

Trade Tech Mechanical Services Inc.

Trade Tech Mechanical Services Inc.

5.0 23 reviews
“Trade Tech installed a boiler system at a rental property of mine and they completed the job on time and on budget.”
Free estimatesLicensed & insured24/7 emergency serviceSince 2001Serves St. Thomas, London, Elgin CountyFamily-owned
12 Barrie Blvd
i
Millcreek Plumbing and Mechanical Ltd.

Millcreek Plumbing and Mechanical Ltd.

4.0 3 reviews
“He helped me a lot and saved my life for so many times!”
55 Progress Dr
i
Orzech Heating and Cooling

Orzech Heating and Cooling

4.8 138 reviews
“This is the 3rd time I use this company and I continue to be exceptionally pleased with their work and service.”
10% offInsured1-yr warranty24/7 emergency serviceResponds within 2 hoursFinancing available
London, ON · 24 km from Saint Thomas
i
Roy Inch & Sons Home Services by Enercare

Roy Inch & Sons Home Services by Enercare

4.7 124 reviews
“Sean was awesome, he helped sort out an issue caused by a previous tech where my home address on my account was changed and fixed the water heater all at the same time!”
Coupons & offersFree estimatesServes LondonLicensedOpen 24 hours
London, ON · 24 km from Saint Thomas
i
Air Design Services Heating & Cooling

Air Design Services Heating & Cooling

5.0 119 reviews
“Air Design has been taking great care of my home for the past couple of years, and great care of my parents' home for many, many years before that.”
Coupons & offersLicensedOpen 24 hoursSince 2004Locally owned
London, ON · 24 km from Saint Thomas
i
Donaldson Home Services

Donaldson Home Services

4.9 124 reviews
“So glad I choose Donaldsons For my new heat pump, they were very helpful and helping me choose the proper model that I needed.”
Coupons & offersFree consultation
London, ON · 24 km from Saint Thomas
Featured

Get the family discount with 10% off from Jamie, 10% off from Anna and $10 off from Zander on a new Donaldson furnace and air conditioning system including our 10 year True Care Warranty. Serving London, St. Thomas, Woodstock, Strathroy & surrounding area. Not valid with any other offer. Limited time only. Call to book a free quote!

i
My Fireplace

My Fireplace

4.8 133 reviews
“He also addressed my questions and adjusted our settings to help maximize our HVAC system's efficiency.”
Free tankless water heater24/7 emergency serviceFinancing availableSince 1996Serves London, St. Thomas, Southwestern OntarioFamily-owned
London, ON · 24 km from Saint Thomas
i
Plumbhouse Plumbing

Plumbhouse Plumbing

4.5 57 reviews
“He did our annual furnace inspections and was on time, easy to communicate with and answered all questions I had re : our properties.”
Coupons & offersSince 2009
London, ON · 24 km from Saint Thomas
i
Book onlineBook
Triton Home Service

Triton Home Service

4.8 112 reviews
“Im doing a basement reno and Ivan and Aron were very responsive to my needs.”
24/7 emergency serviceFinancing availableServes London, St. Thomas +6Since 2016
London, ON · 24 km from Saint Thomas
i
HomeHeating & Air Conditioning, HVACOntarioSt. Thomas, ON

Why these companies made our list

What customers say about companies in St. Thomas

  • “Flexibility in the timing of appointments. Always on time and on schedule, outstanding customer service, highly skilled and personable technicians.” — customer of Abode Home Comfort
  • “Andrew was professional and provided a timely quote and install of our new furnace.” — customer of County Lines Hvac & Fireplaces
  • “Knowledgeable and efficient, the furnace technician came out on the same day I called for service and showed up exactly when expected.” — customer of Cam's Heating & Air Cond Inc
  • “Excellent follow up calls. Very happy with Abode, would definitely recommend this company.” — customer of Abode Home Comfort

Excerpts from public reviews of the companies listed on this page.

Is this page useful? Yes
No
Is there anything wrong with this page?

More HVAC Contractors in Ontario

Popular in St. Thomas

, ON

Guides: HVAC Contractors

Back To Top