Fall Furnace Maintenance Checklist: Get Your Heating System Ready for Winter

Winter waits for nobody, so it’s time to get that furnace in good working order. That means…

• Replacing the filter
• Clearing vents and exterior intake/exhaust pipes
• Testing the thermostat
• Testing your carbon monoxide alarms
• Actually running the furnace before you need it (who’s guilty of it?)

And finally, booking an annual service with a licensed gas contractor.

Let’s make sure you’re ready. Here’s everything you need to know to complete your fall furnace maintenance checklist.

Why Is Fall the Right Time for Furnace Maintenance on Vancouver Island?

Since your heating system may have been sitting idle since spring, September and October are really the ideal months for fall furnace maintenance. Vancouver Island winters tend to be a lot milder than much of Canada. However, they are long and damp, causing leaves and vegetation to collect around exterior vents. 

To catch problems before contractors get too busy, you’ll want to test your furnace before the first cold night hits!

Your Furnace Maintenance Checklist: 6 Things You Can Do Yourself

What’s the best part about these six checks? They only take about 20 minutes! Plus the cost of a filter (if needed).

1. Replace the furnace filter

Natural Resources Canada recommends changing or cleaning forced-air furnace filters about every three months, or sooner when loaded. Pets and smoke have the potential to shorten that interval.

2. Clear vents and return-air grilles

Make sure supply registers and return-air grilles are open and unobstructed. Move furniture, rugs or curtains that might be blocking airflow.

3. Check the outside intake and exhaust

Visually check sidewall intake and exhaust openings for leaves, vegetation, nests or spider webs. Don’t disconnect or modify the venting!

4. Test your thermostat

Switch it to Heat, replace batteries if needed and confirm that the furnace responds appropriately. NRCan notes that reducing the thermostat by 1°C for eight hours can save about 2% on heating energy consumption!

5. Run your furnace for 15 minutes

Run the furnace before you need it. A brief dusty smell is normal on the first fall startup, but persistent burning smells, unusual noises, frequent cycling or no heat should be checked as soon as possible!

6. Test your smoke and carbon monoxide alarms

Press the test button on every alarm and check its replacement date.

That’s where the DIY checklist ends! Don’t open burner compartments, adjust flames, inspect the heat exchanger, alter venting or work on gas piping yourself. Best to leave those jobs to the professionals. Get in touch with us today and we would be happy to help!

What Does a Licensed Gas Fitter Check?

Technical Safety BC recommends annual servicing of home heating appliances by a certified gas fitter working for a licensed gas contractor.

A professional furnace tune-up on Vancouver Island can include inspecting burners, safety controls, venting, gas piping and pressure, the heat exchanger and carbon monoxide levels.

Gas work is regulated in British Columbia, so leave internal gas-appliance work to the qualified professionals!

How Do You Check for Carbon Monoxide Safety?

Carbon monoxide (CO₂) is colourless, odourless and can result from incomplete combustion in furnaces, fireplaces, water heaters and other fuel-burning appliances.

Symptoms of CO₂ poisoning can include headache, dizziness, nausea, fatigue, shortness of breath and confusion. Appliance warning signs include:

• A yellow or wavering flame
• A pilot light that repeatedly goes out
• Soot or scorch marks
• Booming during startup
• Unusual condensation
• A natural-gas smell

If a CO alarm sounds or you suspect a gas leak, leave the home immediately and contact your gas utility or 911 from outside. Do not investigate the furnace yourself.

Follow the alarm manufacturer’s instructions and local requirements. NRCan recommends CO detection near combustion appliances and/or within 5 metres (15’) of bedroom doors.

What Warning Signs Mean Your Furnace Needs Attention?

Book an inspection if you notice any of the following:

• Furnace won’t start or short cycles
  
  • Check the thermostat and filter first.
• Heating costs rise unexpectedly
  
  • Efficiency may have dropped.
• Rooms heat unevenly
  
  • Airflow or equipment performance may be involved.
• Banging, rattling or squealing
  
  • Components may be loose or damaged.
• A burnt or electrical smell persists
  
  • Shut the system down and have it inspected.
• Visible soot or corrosion
  
  • Arrange professional service.

A gas smell or CO alarm is more urgent: leave the home and contact your gas utility or emergency services immediately. You can never be too safe in such situations!

Should You Repair, Replace or Upgrade Your Furnace?

If an older furnace faces a major repair, you should compare the repair cost with replacement. A mid-life furnace that is safe and only needs a straightforward repair may still have years of service left, with the potential to save you a lot of money as opposed to a full replacement.

If you do replace your system, don’t assume the new furnace should be the same size. Home upgrades can reduce heating demand, while oversized equipment might short cycle.

Two-stage or modulating furnaces can better match output to demand. Heat pumps are also worth considering on Vancouver Island because the mild coastal climate is well-suited to heat-pump operation.

Are There Furnace Maintenance Rebates in BC in 2026?

As of 2026, FortisBC’s Appliance Maintenance Program offers eligible residential gas customers rebates for professional servicing.

A furnace or boiler service qualifies for a $50 rebate, while the program offers up to $150 total when eligible furnace or boiler, tankless water heater and fireplace services are combined. Applications generally must be submitted within 60 days.

Better Homes BC also lists current heat-pump and home-efficiency incentives for homeowners considering replacement.

Rebate amounts and eligibility can change, so confirm current requirements before booking work or purchasing equipment!

Get Your Furnace Ready Before the Cold Sets In

Twenty minutes in September buys you a winter without surprises! Change your filter, clear the vents, test your alarms, and book the one job that isn’t a DIY project with us!

Archie Johnstone’s licensed gas fitters have been keeping Vancouver Island homes warm for decades, and fall service spots fill fast once the cold sets in. Book your annual furnace service today!

‍