How much does furnace repair cost in Ontario? (2026)

Prices checked September 2026. Almost every furnace repair bill has two parts: a diagnostic or service-call fee to find the fault, and the repair itself, priced as parts plus labour. Gas furnaces in Ontario must be serviced by a contractor registered with the Technical Standards and Safety Authority (TSSA), using certified gas technicians. That, a stocked truck and after-hours demand in January, is why a $40 part can become a $250 repair.

How much is a furnace service call in Ontario?

A furnace diagnostic or service call usually costs $75 to $150 in the GTA, with $89 to $150 most common, and many companies credit it against the repair if you go ahead. Evening, weekend and holiday calls typically add $50 to $280, although a few companies do not charge an overtime premium at all. Ask which applies before the technician comes out.

What do common furnace repairs cost?

These ranges are built from 2025 and 2026 price guides published by Toronto and Ontario heating contractors, compared across at least three companies per repair. Sources disagree most on motors and boards, because the part price depends heavily on the furnace brand and whether it has a variable-speed (ECM) motor.

What does furnace service cost on Doyo?

On Doyo, Furnace Maintenance is $206.50, and AC Maintenance is also $206.50. That is the full price, Doyo’s service fee included; nothing is added at checkout, and your card is only charged when the job is marked complete. Furnace Repair is by written quote, because the price depends on what has failed: the technician finds the fault and the repair price is put to you in the app for a yes or no before any repair is done.

Gas work in Ontario requires a TSSA-registered contractor and a certified gas technician. Doyo checks the technician’s certificate before they are offered heating work. When you book, include the furnace’s make and age, what it is doing, and a photo of the rating label inside the door; it helps the technician bring the right part.

Is a furnace tune-up worth it?

For most homes, yes, because a tune-up catches the cheap faults (a dirty flame sensor, a clogged filter, a cracked hose) before they stop the furnace on a cold night, when calls cost more. Enbridge Gas advises a yearly inspection by a TSSA-registered contractor; Natural Resources Canada says gas furnaces should be serviced at least every two years. Many manufacturers also expect proof of regular maintenance for warranty claims, so check your warranty terms.

Should I repair or replace my furnace?

Repair is usually the right call for a furnace under about 12 years old with a single failed part. Replacement starts to make sense once the furnace is 15 years or older and the repair is a large share of the cost of a new one, or when the heat exchanger has cracked. A common contractor rule of thumb multiplies the furnace’s age by the repair cost: above about $5,000, get a replacement quote too. It is a rule of thumb, not a law of physics, so ask for both prices in writing.

Are furnace protection plans worth it?

It depends on the age of the furnace and how much risk you want to carry. In 2026, Enercare lists a heating maintenance plan at $9.99 a month and protection plus maintenance at $24.99 a month for a furnace, and Reliance lists similar plans at $9.99 and $23.99. That is roughly $120 to $300 a year. A plan can pay off on an older furnace with an expensive motor or board failure; on a newer furnace under warranty, paying for one tune-up a year is usually cheaper. Read what is excluded and how cancellation works before you sign.

What changes the price of a furnace repair?

1. The part. A flame sensor and a heat exchanger are both furnace repairs, a thousand dollars apart.
2. Brand and model. Proprietary parts cost more and may have to be ordered, which adds a second visit.
3. Standard vs variable-speed. ECM blower motors and modulating gas valves cost far more than standard ones.
4. Timing. After-hours, weekend and holiday calls carry a premium, and the first cold snap of the season brings a rush of calls.
5. Age and condition. A furnace that has not been serviced in years often needs cleaning before the real fault can be diagnosed.
6. Warranty. Many parts carry a manufacturer warranty of several years if the furnace was registered, which can leave only labour to pay.

How do I avoid being overcharged for furnace repair?

• Ask for the service-call fee, the hourly or flat rate, and whether the call fee is credited, before the technician arrives.
• Check the contractor is TSSA-registered; TSSA has an online lookup, and technicians carry a certificate card.
• Get the repair price in writing before work starts. Under Ontario’s Consumer Protection Act, 2002, a business cannot charge more than 10% above its estimate unless you agree to the new price.
• Be careful with door-to-door offers. Unsolicited in-home sales of furnaces and air conditioners have been banned in Ontario since 2018, so a knock at the door selling a new furnace is a red flag.
• Ask to keep the old part. It is a simple way to confirm it was replaced.
• If you are told the heat exchanger is cracked, ask to see it or get a second opinion. It is the most expensive repair on the list.