How Often Should I Get My Furnace Serviced?

Furnace problems can become more urgent during cold weather, so arranging service before the heating season can give you time to review any findings. This guide covers how often you should get your furnace serviced, what that visit includes, the jobs that stay yours between visits, and the situations that move the schedule up, with our protection and maintenance plans priced plainly at the end.

The annual rule, and why fall is the moment

Once a year is the standard across the trade, and early fall, September to November, is the right slot because the furnace is about to run near-constantly for five months and any weakness found in October is a scheduled repair instead of a February emergency. A furnace can develop airflow, combustion, or control issues without an obvious warning, and in Ontario the mechanical work behind that tune-up belongs to certified professionals: gas furnace servicing involves the gas train, venting, and high-voltage components, work performed by TSSA-certified gas technicians through a TSSA-registered fuels contractor.

What a professional furnace tune-up actually includes

A real tune-up is an inspection, a cleaning, and a safety test in one visit, not a glance and a filter swap. Here is what the annual visit covers and why each item is on the list.

Typical annual tune-up scope for a high-efficiency gas furnace; the exact checklist varies by model per the manufacturer’s maintenance requirements.

Your jobs between visits

Homeowner checks between visits are limited but useful. Check the filter regularly, keep supply and return grilles clear, and note changes such as unusual noise, smell, or weak airflow. Leave gas, combustion, venting, and electrical work to a qualified technician.

Homeowner tasks only; anything involving the gas train, burners, or venting belongs to a TSSA-certified technician.

How often to get a furnace serviced: when once a year is not enough

Some situations move the schedule up, and the pattern is simple: more runtime, more dust, or more risk means more attention. Match your home below.

Rhythms reflect standard trade guidance; the manufacturer’s maintenance schedule for your exact model governs. This schedule applies across Mississauga, Brampton, Etobicoke, Milton, Georgetown, Caledon, and Bolton.

Warranty, cost, and the plan math

Skipping the annual visit can cost more than the visit ever would, because many manufacturers require proof of annual professional maintenance to keep parts warranties valid, and a denied warranty claim on a major component dwarfs years of tune-up fees. That is the honest case for a maintenance plan: it turns the annual visit into a small fixed monthly cost and adds repair coverage on top. Our plans price as follows, and the honest caveat is that a plan only pays off if you would otherwise skip or forget the annual visit; a homeowner who books a tune-up every fall without fail can simply pay per visit.

Plan prices verified on the Aire One Peel protection plans page, August 2026; asterisked terms and full coverage details per the plans page, subject to change.

Furnace servicing: frequently asked questions

How often should a furnace be serviced in Ontario?

A common starting point is one professional service visit each year, ideally before the heating season. Follow the manufacturer’s schedule and ask a qualified technician whether an older, heavily used, dusty, or dual-fuel system needs additional attention. Check the filter regularly between visits.

What happens if I don’t service my furnace?

Skipping maintenance can allow airflow, combustion, venting, or control issues to go unnoticed. It may also affect warranty requirements if your manufacturer’s terms call for documented service. Check the warranty wording for your model and keep service records.

When is the best time to service a furnace?

Early fall is a practical time to arrange service because it leaves room to address findings before colder weather arrives.

How often should I change my furnace filter?

Check the filter monthly and replace it at the interval recommended for its size and system. Homes with pets, renovations, or allergies may need more frequent checks. A dirty filter can restrict airflow, so replace it when it is visibly loaded or according to the manufacturer’s guidance.

Does skipping maintenance void my furnace warranty?

It depends on the manufacturer’s written terms. Some warranties require documented maintenance, while others describe different conditions. Keep service records and check the warranty for your specific model before assuming a claim is affected.

Is an annual furnace inspection required by law in Ontario?

For a typical homeowner, annual servicing is strongly recommended rather than legally mandated, but the surrounding rules are real: gas appliance work must be done by TSSA-certified technicians, and Ontario’s carbon monoxide alarm requirements, expanded under O. Reg. 87/25 effective January 1, 2026, are law. Landlords also carry maintenance obligations for tenant safety.

Final verdict

Use an annual service visit as a starting point, follow the manufacturer’s schedule, and check the filter between visits. A qualified technician handles the combustion, venting, and safety checks that homeowners should not do themselves. If you prefer a monthly plan, review its current price, coverage, exclusions, and cancellation terms, and if your furnace is old enough that every tune-up finds something new, the honest next conversation is our sizing and replacement guidance, starting with what size furnace your home needs before any furnace installation in Mississauga.

Sources and references

Technical Standards and Safety Authority (TSSA), gas appliance servicing and CO alarm requirements incl. O. Reg. 87/25
Health Canada, carbon monoxide safety guidance
Natural Resources Canada, furnace efficiency and maintenance
Aire One Peel protection and maintenance plans, verified pricing