“During a no heat call they found a cracked heat exchanger. Instead of pressuring us, the tech laid out repair and replacement options with clear pricing and let us decide.”
CS
Clara S.Lucan, ON
Services
Thermostat Repair and Replacement, Done Right the First Time
St Thomas Heating & Cooling: Stay in control of your home's comfort with professional thermostat repair and replacement in St. Thomas. From inaccurate readings and short cycling to full smart-thermostat upgrades, our licensed technicians restore accurate temperature control, better efficiency, and reliable performance.
Why Homeowners Call Us
Furnace short cycling every few minutes despite a fresh battery?
A faulty thermostat creates uneven comfort and quietly inflates energy bills. We repair and replace thermostats to restore accurate control and dependable HVAC performance.
Repair First, Replace Only When Needed
Most thermostat faults come down to wiring, batteries, sensors, or relays, and most can be repaired. If replacement is the smarter spend, we show you why before anything comes off the wall.
Annual Calibration Keeps Readings True
Sensors drift over time, and a thermostat off by two degrees runs your furnace two degrees wrong. A quick calibration check during a tune-up keeps readings honest and runtime efficient.
Every Repair Backed in Writing
Repairs and installations come with written documentation of what was done and which parts were used. If anything we touched fails, you have our name, our number, and our promise.
FAQ
Thermostat Repair & Replacement in St. Thomas: Common Questions
How much does thermostat repair or replacement cost?
You are paying for the part plus the labour. Repairs typically need minor parts, while a replacement adds the cost of the new unit, mounting, and system configuration.
How quickly can a thermostat be repaired or replaced?
Same-day service covers most calls. We carry common thermostats and parts on the truck, so a morning diagnosis often becomes an afternoon fix.
Should I repair my thermostat or replace it with a new one?
If the fault is a battery, sensor, or wire, repair wins easily. Replace when the unit is past its service life, incompatible with new equipment, or costing you efficiency.
Reviews
What St. Thomas Homeowners Say
Real feedback from neighbours we've helped stay comfortable year-round.
“Our lakeside cottage had no heat source at all. They installed a two-zone ductless system quietly and carefully, and even followed up afterward to confirm everything was performing well.”
OW
Olivia W.Lucan, ON
“With three shedding cats, our vents were packed with fur. They covered the floors, cleaned each register by hand, and my allergies calmed down within days.”
WT
Willa T.Lucan, ON
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We Can Help Solve Your Thermostat Repair & Replacement Needs
Don't let a comfort problem disrupt your home. Get fast, reliable service from St. Thomas's trusted local HVAC team.