Auto AC & Heating Shops in Cornwall, ON

Find trusted auto ac & heating services in Cornwall. Compare prices, read reviews, and book online.

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Casey Mechanical Inc
Cornwall • ≈ 3 km
CA
920 Carleton St, Cornwall, ON K6H 6B9, Canada, Cornwall
★ 4.9
116 Google reviews
Response ≈ 40 min $ • Quotes free
Auto AC & Heating Auto Cooling SystemFuel System
📞 (613) 938-1210 Free quote • Verified
Auto M.D.
Cornwall • ≈ 5 km
AU
926 Carleton St, Cornwall, ON K6H 6B9, Canada, Cornwall
★ 4.8
66 Google reviews
Response ≈ 22 min $$ • Quotes free
Auto AC & Heating Auto MechanicTransmission
📞 (613) 932-0832 Free quote • Verified
City Radiator Auto Centre
Cornwall • ≈ 3 km
CI
1900 Pitt St, Cornwall, ON K6J 5H3, Canada, Cornwall
★ 4.8
69 Google reviews
Response ≈ 47 min $$ • Quotes free
Auto AC & Heating Auto Cooling System
📞 (613) 933-3880 Free quote • Verified
Walker Home Services (formerly Walker ClimateCare
Cornwall • ≈ 7 km
WA
1714 Vincent Massey Dr, Cornwall, ON K6H 5R6, Canada, Cornwall
★ 4.8
1584 Google reviews
Response ≈ 41 min $$$ • Quotes free
Auto AC & Heating Auto Cooling System
📞 (613) 416-7233 Free quote • Verified
Marc Viau Mechanical
Cornwall • ≈ 9 km
MA
209 Eleventh St W, Cornwall, ON K6J 3B4, Canada, Cornwall
★ 4.4
25 Google reviews
Response ≈ 37 min $ • Quotes free
Auto AC & Heating Auto Cooling System
📞 (613) 932-8180 Free quote • Verified
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Cornwall customer reviews

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Verified Reviews for Auto AC & Heating
★ ★ ★ ★ ★

“I called Auto MD Friday morning before labour day with a transmission problem. I was told that there would be little chance that I could get the vehicle looked at let alone repaired that day. They assured me that Tuesday morning they would be able to help me.
I called CAA and had the vehicle (2013 Silverado) towed to their shop at about 11:30 am. There were people coming and going at this very busy shop. I was thinking that Friday before the long weekend was not a good time to have vehicle problems.
The vehicle was stuck in reverse and wouldn't start or drive.
When the tow driver dropped it off the mechanic came out and went under behind the driver wheel and announced it was now in park so no need to chalk the wheels.
After speaking with them I figured I would be at he camp site until Tuesday. My wife and I went to the park for a picnic lunch and before we knew it the garage called to say the truck was ready for pickup.
I could hardly believe it. When I went to pay I was flabbergasted at the small amount of the invoice.
Thank you so much for making our Holliday weekend enjoyable and stress free.
Robert and Terry Spencer”

Terry Spencer • Auto AC & Heating at Auto M.D., Cornwall
★ ★ ★ ★ ★

“Great prices, fantastic work. These guys are great. Thanks again for getting the heat working in my Dodge Ram”

Rob Baxby • Auto AC & Heating at Auto M.D., Cornwall
★ ★ ★ ★

“Corey is great!!”

Wendy • Auto AC & Heating at Marc Viau Mechanical, Cornwall
★ ★ ★ ★ ★

“Responded quickly for a blocked sewer pipe. The technician, Carson, was pleasant and worked quickly in my crawlspace to clear the blockage. Well done.”

Jim Devine • Auto AC & Heating at Walker Home Services (formerly Walker ClimateCare, Cornwall
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Find a Best Auto AC & Heating in Cornwall, ON

Boommar lists 5 verified mechanics in Cornwall. Compare real reviews, response times, pricing bands, and open bays — then book online.

Common Causes of AC & Heating Failure

Refrigerant leaks from deteriorated O-rings, hoses, or the condenser
Failed compressor clutch or internally damaged AC compressor
Clogged cabin air filter restricting airflow to the vents
Leaking or plugged heater core causing foggy windows and sweet smell
Broken blend door actuator preventing hot/cold air mixing
Failed blower motor or resistor stopping airflow from the vents entirely

Signs Your Auto AC or Heating System Needs Service

Air conditioning blows warm air instead of cold
Heater blows cold air even after the engine warms up
Weak airflow from the vents even at the highest fan setting
Strange sweet smell inside the cabin indicating a heater core leak
Unusual clicking or grinding noises when adjusting the temperature
Windows fog up excessively and the defroster doesn't clear them

Auto AC & Heating Services Available

AC Recharge & Leak Test

Evacuating, testing for leaks, and recharging refrigerant

AC Compressor Replacement

Installing a new compressor with full system flush

Heater Core Replacement

Dashboard removal and heater core swap

Cabin Air Filter Replacement

Installing a fresh filter for clean cabin airflow

Blend Door Actuator Repair

Replacing the motor that controls hot and cold air mixing

Blower Motor Replacement

Restoring full fan speed and airflow

Auto AC & Heating Tips

Run your AC system for at least 10 minutes per month even in winter to keep the seals lubricated
Replace your cabin air filter every 20,000-25,000 km for optimal airflow and air quality
If your AC stops blowing cold, get a leak test before just adding more refrigerant
A sweet antifreeze smell inside the cabin is a strong indicator of a leaking heater core
After winter, have your AC system inspected before the summer heat arrives
Don't ignore a defroster that doesn't work—it's a serious safety hazard in cold weather

Frequently Asked Questions

How much does an AC recharge cost in Cornwall? +
A basic AC recharge with leak inspection costs $150-$300. If a leak is found and a component needs replacement (condenser, evaporator, or compressor), the total repair can range from $500-$2,000+.
Why does my AC blow cold then warm? +
This is often caused by an intermittent refrigerant leak, a failing compressor clutch, or a blocked expansion valve. A professional leak test and system pressure check can pinpoint the exact cause.
How much does heater core replacement cost? +
Heater core replacement is labor-intensive because the dashboard must be partially or fully removed. Expect to pay $800-$1,800+ depending on your vehicle's complexity.
How often should I recharge my car's AC? +
A properly sealed AC system should not need regular recharging. If it needs refrigerant frequently, there's an active leak that must be repaired first to avoid environmental damage and ongoing costs.