A furnace is easy to forget about until the morning it will not turn on. Because it runs hardest during the coldest Canadian weeks, a small amount of routine care makes a big difference in safety, comfort, and your heating bill. This checklist splits the work into what you can handle yourself and what belongs to a certified technician. For the full picture across every part of your system, start with our complete HVAC maintenance guide.
What furnace maintenance can you do yourself?
Three simple habits keep a furnace running well between professional visits. Change the air filter every one to three months during the heating season, more often if you have pets or run the fan constantly. A clogged filter is the single most common cause of poor airflow and overheating. Keep the area around the furnace clear of boxes, laundry, and dust so it can breathe. Check your vents and cold-air returns to make sure furniture or rugs are not blocking them.
If you only do one thing, change the filter. A dirty filter forces the blower to work harder, drives up your electricity use, and can cause the furnace to shut down on a safety limit on the coldest night of the year.
What does a professional furnace tune-up include?
An annual tune-up is where the safety and efficiency checks happen. A technician will inspect the heat exchanger for cracks, test the ignition and flame sensor, check gas pressure and burner operation, clean the components, verify the thermostat calibration, and confirm the system cycles on and off correctly. This is also when a small worn part gets caught before it fails. The same visit protects your manufacturer warranty, which usually requires documented annual service.
When should you book furnace maintenance?
The best time is early fall, before the first cold snap and before technicians get busy with no-heat emergency calls. Booking in September or October means your furnace is checked and ready when you need it most. If you rely on both heating and cooling, it often makes sense to service everything together on a seasonal maintenance visit, and to fold both seasons into a maintenance membership so nothing gets missed.
What are the warning signs your furnace needs service?
Call a technician if you notice short cycling (the furnace turning on and off rapidly), weak or uneven heat, a yellow rather than blue burner flame, unusual banging or rattling, a spike in your heating bill, or the smell of gas. A carbon monoxide detector that alarms is an emergency: leave the home and call your gas provider. For a deeper look at these symptoms, see our guide to the warning signs your HVAC needs service.
Does a furnace still need maintenance if it is new?
Yes. Even a brand-new furnace benefits from an annual check to confirm it is operating safely and efficiently, and most warranties require it. Consistent maintenance is one of the most reliable ways to reach the full 15 to 20 year lifespan a quality furnace is built for. To plan the rest of your year, pair this with our seasonal HVAC maintenance checklist.
Ready to book your fall furnace tune-up? Schedule a visit with Greenfoot Energy today.