Home Efficiency Tools
Window Replacement Calculator Canada — Energy Savings Payback
Calculate annual heating savings and payback period from replacing windows in your Canadian home. Compares U-factors and uses provincial heating degree days.
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Common questions
What is a U-factor and why does it matter for Canadian windows?
The U-factor measures how much heat a window loses — lower is better. Single-pane windows have a U-factor around 1.10; older double-pane around 0.49; Energy Star certified triple-pane can reach U-0.17. In Canada's cold climate, a lower U-factor means less heat escaping through the glass, which directly reduces your heating bill.
Do Energy Star windows qualify for rebates in Canada?
Yes. The Canada Greener Homes Grant offers up to $250 per window/door unit (max $5,000) for Energy Star Most Efficient certified windows. Some provinces and utilities offer additional rebates — Ontario's Enbridge and Hydro One programs, BC's CleanBC, and Nova Scotia's Efficiency NS all have window incentives. Always get an EnerGuide pre-retrofit evaluation first.
Are triple-pane windows worth it in Canada?
In most Canadian climates, triple-pane windows (U-0.17 to U-0.22) provide a meaningful improvement over double-pane low-e (U-0.25 to U-0.30), especially on north-facing or large windows. The premium over double-pane is typically $100–$300 per window. In colder provinces (Prairies, Northern Ontario, Quebec), the payback is stronger. In milder climates (Southern BC), the incremental benefit is smaller.
How long do replacement windows last in Canada?
Quality vinyl or fibreglass windows typically last 25–40 years in Canadian conditions. Fibreglass frames handle freeze-thaw cycles better than vinyl in very cold climates. The glass seal (preventing argon/krypton gas loss) typically carries a 20-year warranty. Condensation between panes indicates a failed seal and means the insulating gas has escaped — it's time to replace that unit.