Furnace Replacement Cost & When to Replace
A new furnace runs C$4,100–C$11,000 installed. Here are the warning signs, the cost by type and efficiency, and how to avoid an oversized, short-cycling unit.
Updated July 10, 2026 · 6 min read
A furnace is easy to ignore until it’s blowing cold air in January. Most units last 15–20 years, and replacing yours before it dies — rather than during a cold snap — means better pricing, more choices, and no emergency markup.
Here’s what a furnace replacement costs in 2026, the signs it’s time, and how to choose the right unit.
Signs it’s time to replace
A few of these together mean start planning:
- Age over 15 years.
- Rising heating bills as efficiency drops.
- Frequent repairs, or a repair quote that’s a big fraction of a new unit.
- Uneven heating, short-cycling, or constant running.
- Yellow (instead of blue) burner flame, or any carbon-monoxide detector alarm — treat this as an emergency.
2026 furnace costs
Priced by fuel type and efficiency (AFUE rating):
- Gas furnace, standard efficiency (80% AFUE): C$4,100–C$7,500 installed.
- Gas furnace, high efficiency (90–97% AFUE): C$6,200–C$11,000 installed.
- Electric furnace: C$3,400–C$6,900 installed (higher running cost in many areas).
- Heat pump (as a furnace alternative): C$8,200–C$22,000 often rebate-eligible.
Sizing and efficiency
Bigger is not better. An oversized furnace short-cycles — blasting on and off — which wastes fuel, wears parts, and leaves rooms unevenly heated. A good installer runs a load calculation for your home’s size, insulation and climate rather than just matching the old unit.
Higher AFUE means more of your fuel becomes heat: a 96% unit wastes only 4%, versus 20% for an 80% unit. In cold climates the fuel savings can pay back the price difference; in mild climates the payback is slower.
Heating & cooling costs in Canada
Figures are in Canadian dollars. Canada’s cold winters make heating the priority — high-efficiency furnaces and cold-climate heat pumps (often with rebates through provincial and federal programs) are the norm. Gas work must be done by a licensed tradesperson under permit.
Right-size the system for your climate zone; an oversized unit short-cycles and wastes money, while an undersized one struggles in a Prairie cold snap.
Frequently asked questions
How long does furnace installation take?
A straightforward like-for-like swap is usually done in a day. Switching fuel types or efficiency levels (which can change venting) may take longer.
Should I replace the AC at the same time?
If your AC is also near the end of its life, replacing both together often saves on labour and ensures the system is properly matched for efficiency.
Are there rebates for a high-efficiency furnace?
Often yes — high-efficiency gas furnaces and especially heat pumps frequently qualify for utility rebates and federal tax credits in 2026. Ask your installer to itemize current incentives.
What’s AFUE?
Annual Fuel Utilization Efficiency — the percentage of fuel converted to usable heat. Higher is more efficient; 80% is standard, 90–97% is high-efficiency.
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