Furnace Installation & Repair
Keep your home warm all winter with expert furnace repair and installation. From emergency calls to routine maintenance, we keep your system safe and efficient.
Learn more
Licensed, Insured & Local
St Thomas Heating & Cooling, Expert Heating & Cooling Repair in St. Thomas, ON
At St Thomas Heating & Cooling, we treat your home like our own. Serving St. Thomas, Ontario and Middlesex County, we deliver honest, efficient, and dependable HVAC solutions for year-round comfort.
- 24/7 HVAC Service
- FinanceIt Financing
- 100% Satisfaction Guaranteed
- Licensed & Insured
24/7Emergency service
Licensed& fully insured
FreeNo-obligation quotes
Guaranteed100% satisfaction
Our Story, Your Comfort
An Established Name in St. Thomas Home Comfort
A failing furnace or a dead air conditioner is more than an inconvenience; it disrupts your whole household. As a fully licensed and insured HVAC company serving St. Thomas, we move fast to restore normal life, with honest advice at every step.
Anyone can fix a furnace once. Earning the next call is the real work. We keep detailed service records for every home we visit, remember what we found last time, and plan maintenance around your system instead of a generic schedule. That is how neighbours become long-term customers.
Backed by our 100% satisfaction guarantee on every job.
Every System, Every Season
One Team for Heating, Cooling, Air Quality, and Controls
Heating, cooling, air quality, and controls, all looked after by the same crew. Whether you need a repair today or a maintenance plan that keeps everything running for years, you only ever need one number.
AC Installation & Repair
Beat the heat with reliable AC repair for central and ductless systems, fast diagnostics, tune-ups, and replacements to keep you cool all summer.
Learn moreHeat Pumps
Year-round, energy-efficient heating and cooling. We help you select, install, and maintain heat pump systems that lower energy costs and boost comfort.
Learn moreDuct Cleaning
Remove dust, allergens, and debris from your ductwork to improve airflow, system efficiency, and the indoor air your family breathes.
Learn moreThermostats
Smart and programmable thermostat repair and replacement for better temperature control, scheduling, and real energy savings.
Learn moreDuctless AC Installation
Ideal for homes without ductwork, targeted, energy-efficient cooling and heating designed precisely around your space.
Learn moreFireplace Installation
Bring warmth and ambiance to lake-effect St. Thomas winters with gas and electric fireplaces, safely installed in heritage homes and new builds alike.
Learn moreBoiler Service
Boiler repair, installation & maintenance for radiator and in-floor hydronic heat, gas, propane or oil, across St. Thomas heritage homes and new builds.
Learn more
How We Work
Why Ontario Homeowners Recommend Us
From the moment we pick up the phone, you will know exactly what happens next and what it involves.
Your Options, Laid Out Clearly
We measure airflow, check safety controls, test electrical connections, and ask how the house actually feels to you. That conversation shapes a quote that details the work, the timeline, and the outcome in writing before we begin.
Craftsmanship You Can Inspect Closely
Drop cloths go down before toolboxes open. Boot covers stay on, dust gets vacuumed as we go, and the only sign we were ever in your home is equipment that runs the way it should.
Care Beyond the Call
Our relationship does not end when the job is done. Repair and maintenance service continues for the life of your equipment, keeping everything running at peak efficiency through freeze and thaw alike.
Testimonials
Real Feedback From Local Homes
Reputation in a town this size is earned one job at a time. Here is ours.
“We upgraded our AC this summer and the installation process was seamless. Highly recommend St. Thomas Heating & Cooling.”
ER
Erin R.Shaw Valley, ON
“They maintain our HVAC systems yearly. The technicians are always professional, thorough, and on time.”
JM
Jenson M.St. Thomas, ON
“Quick response when our AC made strange noises. The team fixed it the same day.”
JA
Journee A.St. Thomas, ON
Comfort Care
Preventive Care, Scheduled Around Your Life
One membership covers the heating and cooling side of homeownership. Perks include priority booking on every visit, 15% off repairs big and small, and organized service records that document each filter, part, and adjustment. Members also get first pick of installation dates when it is finally time to replace.
Book Your Free Quote Today
Serving St. Thomas and every road beyond it, our crew brings the same urgency to a midnight no-heat call and a scheduled summer tune-up. Tell us what is happening; we will take it from there.
From the Blog
Latest News & Home Comfort Tips
Practical advice to help you get the most from your heating and cooling system in St. Thomas's climate.
Home Comfort Tips
How Often Should You Service Your HVAC System in St. Thomas, Ontario?
St. Thomas's real seasons push your HVAC system hard. Here's how often you should service your furnace and AC, and why twice a year is the sweet spot.
Read article
Home Comfort Tips
Signs Your Furnace Needs Repair Before a St. Thomas Winter
Don't wait for the coldest night of the year. Here are the most common warning signs your furnace needs repair before a St. Thomas winter sets in.
Read article
Home Comfort Tips
Why Your Air Conditioner Struggles During Humid St. Thomas Summers
If your AC runs all day but your home still feels sticky, humidity is likely the culprit. Here's why, and what you can do about it.
Read article
FAQs
Good Questions From Homeowners
Costs, timing, warranties, and emergencies: we answer the questions we hear most often.
How quickly can I get furnace repair in St. Thomas, Ontario?
Our expert technicians provide fast, reliable furnace repair in St. Thomas and surrounding Middlesex County areas. We prioritize emergency service calls so your home heating is restored promptly, often the same day.
What types of AC repair services do you offer?
We offer comprehensive AC repair in St. Thomas, including diagnostics, component replacement, and maintenance for central air conditioning and ductless mini-split systems to meet your cooling needs.
How do I know if my heat pump needs repair or replacement?
Signs like uneven heating or cooling, unusual noises, or rising energy bills may indicate your heat pump needs service. Our team provides professional repair and installation for optimal year-round comfort.
Why is duct cleaning important for my home?
Dust and allergens reduce the efficiency of your heating and cooling system. Professional duct cleaning helps your HVAC system run better and improves the indoor air quality your family breathes.
Can you repair or replace my thermostat?
Yes. We provide thermostat repair and replacement in St. Thomas, including programmable and smart models, to optimize your heating and cooling performance and lower energy use.
What types of fireplaces can you install?
We install gas, electric, and wood-burning fireplaces, safely integrating them with your home heating system for warmth, ambiance, and code-compliant peace of mind.
Do you install ductless AC systems, and are they energy-efficient?
Absolutely. Our ductless AC installations provide energy-efficient cooling and heating for precise comfort without the need for ductwork.
Are your technicians licensed and experienced?
Every technician on our team is fully licensed, insured, and trained to deliver professional service using proven repair techniques.
Do you serve areas outside of St. Thomas, Ontario?
Yes. We provide HVAC services throughout St. Thomas and nearby communities including London, Strathroy, Dorchester, Komoka, and across Middlesex County.
Do you offer 24/7 emergency service?
We do. Heating and cooling emergencies don't keep business hours, so neither do we, call us any time, day or night.
Service Area
Serving St. Thomas & Surrounding Communities
We provide fast, reliable hvac service throughout St. Thomas and Middlesex County. If you don't see your town listed, give us a call, chances are we cover it.