Furnace Maintenance: What a Tune-Up Includes, and Why Your Warranty Wants One
A furnace tune-up in Ontario costs $120–$250 and should be done once a year, ideally in September or October before the heating season. A proper one takes 60–90 minutes and includes gas and carbon monoxide leak testing. Most manufacturer warranties require documented annual service, so skipping it can cost more than it saves.
Furnace maintenance is the easiest home-services spend to postpone, because nothing visibly goes wrong when you do. The consequences are all deferred: a component wearing quietly, and a warranty condition quietly going unmet.
2hvac.ca sells no maintenance plans and installs nothing, so this page has no product at the end of it. It covers what a tune-up actually includes, what it should cost, and the warranty clause that turns a skipped $150 service into a declined $900 claim.
The clause most homeowners never read
This is the part worth knowing before anything else on this page. Most major manufacturer warranties — Lennox, Carrier, Goodman, Trane among them — require documented annual maintenance by a licensed technician for the parts warranty to remain valid.
The practical effect: skip a year, have a control board or a heat exchanger fail in year eight, and the manufacturer can decline the claim on the grounds that the maintenance condition was not met. You are then paying for a part that should have been free — several hundred to several thousand dollars, against a service that costs $150.
⚠️ Read your own registration rather than taking this as universal. Terms differ by manufacturer, by model and by year, and some are far more lenient than others. What is consistent is that the condition exists and that homeowners rarely know it does. If you cannot find the paperwork, the manufacturer can usually look it up from the serial number.
The documentation matters as much as the work. A receipt naming the technician, the date and the licence number is what a claim needs — a friend who is handy does not satisfy the clause, however competent.
What a real tune-up includes
A proper service runs 60 to 90 minutes and works through around twenty checks. If someone is in and out in fifteen minutes having changed the filter, you have bought a filter change.
- Combustion and gas testing — checking for gas leaks and testing for carbon monoxide. The safety half, and the reason this is not a DIY job.
- Burners and heat exchanger inspected and cleaned; the exchanger checked for cracks.
- Igniter and flame sensor cleaned and tested — the two components behind most no-heat calls.
- Blower and motor cleaned, airflow checked, belts and bearings where fitted.
- Venting and the condensate drain checked for blockage — a blocked flue is a safety matter, not a comfort one.
- Thermostat calibration, safety controls and the limit switch tested.
- Filter replaced or cleaned, and a written report of what was found.
Want a second opinion from an independent HVAC technician before you sign anything? (437) 523-7774 — the line is answered around the clock and costs you nothing.
What it costs, and when to book it
Book it in September or October. Demand and prices climb once the cold arrives, and the entire point is to find a failing igniter before the first genuinely cold night rather than after it.
What you can do yourself between services
Change the filter every one to three months in the heating season, more often with pets or a renovation. It is the single highest-value thing a homeowner can do: a restricted filter makes the furnace run hot, trip its limit switch and short-cycle, which is exactly the wear pattern that shortens a unit's life.
Keep the area around the furnace clear, check the outdoor vent termination is not blocked by snow or ice through the winter, and test the carbon monoxide alarm. None of that needs a technician and all of it matters.
| Option | Typical cost | What to check |
|---|---|---|
| One-off tune-up | $120–$250 | That it is a real inspection, not a filter change — ask how long it takes |
| Annual maintenance plan | $150–$500 / year | Whether it includes parts or priority booking, and whether it auto-renews |
| Skipping it | $0 now | Possible loss of the parts warranty; a failed board can be $300–$650 |
Common questions
How often should a furnace be serviced?
Once a year, ideally in September or October before the heating season starts. Booking ahead of the cold means finding a failing igniter or a fouled flame sensor before it fails on the first cold night, and it avoids the price and availability squeeze that arrives with the first frost.
How much does a furnace tune-up cost in Ontario?
Published rates run about $120 to $250 for a one-off service, with most falling between $129 and $249. Annual maintenance plans run $150 to $500 depending on whether they include parts or priority booking. We do not set these prices — the technician you are connected to quotes you directly.
Does skipping maintenance void a furnace warranty?
It can. Most major manufacturer warranties require documented annual service by a licensed technician, and skipping a year can be grounds to decline a parts claim. Terms differ by manufacturer and model, so read your own registration — but the condition usually exists, and most homeowners do not know it does.
What should a furnace tune-up actually include?
Around twenty checks over 60 to 90 minutes: gas and carbon monoxide leak testing, burners and heat exchanger inspected, igniter and flame sensor cleaned, blower and airflow checked, venting and condensate drain cleared, thermostat and safety controls tested, filter replaced, and a written report. Fifteen minutes and a new filter is not a tune-up.
Can I do furnace maintenance myself?
You can and should change the filter every one to three months, keep the area clear, check the outdoor vent is not blocked by snow, and test the carbon monoxide alarm. Anything on the gas side needs a TSSA-certified technician, and self-service will not satisfy a warranty clause that asks for documented professional maintenance.
Sources
Figures on this page are published market data, not our own quotes. Programmes and prices change — check each before relying on it.
- Custom Contracting — Furnace Maintenance Cost Ontario 2026 — read 2026-09-07
- HomeStars — Furnace Maintenance Cost Guide — read 2026-09-07
- Dynamic Heating & Cooling — Furnace Tune-Up Checklist — read 2026-09-07