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What Size Furnace Do I Need in Ottawa?

What Size Furnace Do I Need in Ottawa?

Quick answer: The right furnace size for an Ottawa home comes from a room-by-room heat-loss calculation (CSA F280) at a design temperature of about −25 °C, not from square footage. Most homes here need 40,000–80,000 BTU/h of heat output. Many existing furnaces are...
Best Furnace Brands for Ottawa Homes (2026)

Best Furnace Brands for Ottawa Homes (2026)

Quick answer: The best furnace brands for Ottawa homes in 2026 include Lennox, Goodman, Carrier, Trane, Daikin, Napoleon and York. All sell 95%+ AFUE gas furnaces, as Canadian rules require. The bigger choices are the furnace type (single-stage, two-stage or...