Replace your furnace if it’s over 15 years old, needs a repair costing more than a third of a new unit, or has a cracked heat exchanger. Repair it if it’s under 10 years old and the fix is minor. For furnaces in between, multiply the repair quote by the unit’s age: over $5,000, lean replace; under, lean repair. Deciding in October, before the first deep freeze, gives you time to compare quotes and claim rebates instead of making a panic purchase in January.
Quick decision guide
| Situation | Lean toward |
|---|---|
| Under 10 years old + minor repair | Repair |
| Over 15 years old + any major repair | Replace |
| Cracked heat exchanger | Replace (safety issue, repair rarely economical) |
| Repair cost × furnace age > $5,000 | Lean replace |
| Rising gas bills + frequent repairs | Get a replacement quote alongside the repair quote |
How long should a furnace last in Ontario?
A well-maintained gas furnace typically lasts 15 to 20 years. In Barrie, furnaces work harder than the Canadian average — our heating season stretches from October into April, and lake-effect snow and deep cold snaps mean long runs at full output. A furnace that skipped annual maintenance often starts failing in the 12-to-15-year window.
If yours was installed before 2011, it’s entering the zone where every major repair deserves the repair-or-replace conversation.
What are the signs your furnace is on its way out?
Watch for heating bills creeping up year over year with no rate change, uneven heat between rooms, yellow burner flames instead of blue, more frequent repairs, and rumbling or banging at startup. None of these alone means replacement, but two or three together, on an older unit, usually do.
Yellow flames can also signal incomplete combustion, so have them checked promptly rather than waiting. A carbon monoxide alarm or a technician flagging heat exchanger corrosion moves the decision from “eventually” to “now”.
What does a new furnace cost in Barrie in 2026?
Most Barrie homeowners pay between $4,500 and $8,000 installed for a high-efficiency gas furnace, depending on the home’s size, the brand and efficiency tier, and whether ductwork or venting needs modification. Two-stage and modulating models cost more upfront but run quieter and heat more evenly, which matters in our long shoulder seasons.
Many homeowners now pair replacement with a cold-climate heat pump in a hybrid setup, letting the heat pump handle milder days and the furnace take over in deep cold. Rebates have made this option far more attainable.
Will a new furnace lower your gas bill?
Usually, yes. Since July 2019, every new residential gas furnace sold in Canada has had to meet a minimum 95% efficiency (AFUE) rating. Many older mid-efficiency furnaces are rated around 78% to 80%, so replacing one can cut the gas used for heating by roughly 15% to 20% for the same comfort.
A quick way to tell: if your furnace vents into a chimney instead of through white PVC pipes on an outside wall, it’s almost certainly an older mid-efficiency model, and the savings from replacing it will be at the higher end.
What rebates can shift the math toward replacing?
Ontario’s Home Renovation Savings Program, delivered through Enbridge Gas and Save on Energy, can take up to $2,000 off a cold-climate heat pump in a gas-heated home, and more in homes heated by oil, propane, or electricity. There’s currently no standalone rebate for a new gas furnace, which is one reason the hybrid setup has become so popular. Financing spreads the remainder into manageable monthly payments. Programs change and budgets run out, so confirm current amounts before you commit — but in 2026, a homeowner facing a $1,500 repair on an old unit can often get into new equipment for less net cost than they expect.
An energy audit is required for some programs, and audits book up in late fall. One more reason to start in October.
Why decide now instead of waiting for it to die?
A furnace that fails in January forces a rushed decision: limited stock, premium emergency pricing, and days without heat while you wait for installation. Deciding in October means you can compare models and quotes calmly, schedule installation at your convenience, and have the new system proven before the real cold arrives.
FAQ
Is it worth repairing a 20-year-old furnace? Rarely. At 20 years you’re past typical lifespan, efficiency is well below modern units, and parts get scarce. Put repair money toward replacement.
Can a cracked heat exchanger be repaired? Technically a heat exchanger can be replaced, but on an older furnace the cost usually approaches a new unit. Because a cracked exchanger can leak carbon monoxide, it should never be ignored or patched.
Will a new furnace lower my gas bill? Usually. New gas furnaces in Canada must be at least 95% efficient, compared with roughly 78% to 80% for many older mid-efficiency models, so the same heat takes about 15% to 20% less gas.
How long does furnace installation take? Most straightforward replacements are done in one day. Venting changes, ductwork modifications, or hybrid heat pump additions can extend that to two.
Should I switch from a furnace to a heat pump? In Barrie’s climate, a cold-climate heat pump paired with a gas furnace (hybrid) is often the sweet spot: lower operating costs most of the year, with gas backup for extreme cold. An all-electric setup can work too; it depends on your home and electrical capacity.
Do new furnaces come with warranties? Yes, typically 10 years on parts and 20 years to lifetime on the heat exchanger. Most manufacturers require the furnace to be registered after installation, and many also require documented annual maintenance to keep that coverage. See our warranty details.
Get both quotes and decide with real numbers
Affordable Comfort Heating & Cooling gives Barrie, Collingwood, and Wasaga Beach homeowners honest repair-versus-replace assessments, with current rebate amounts built into the quote. Request yours at barrieheatingcooling.ca or call our Barrie team before the snow flies.
