Heat loss and cooling load calculators based on CSA F280 and Canadian city design temperatures. Covers all provinces.
Furnace Sizing Calculator
Fuel Bill MethodReplacing your furnace? Size it from your actual gas bill — no R-values or blueprints needed. More accurate than rules of thumb for existing homes.
Open calculatorHeat Load Calculator
CSA F280New home or renovation? Calculate design heat loss using CSA F280 — enter insulation levels, city, and floor area.
Open calculatorCooling Load Calculator
CSA F280 / ASHRAEHow many BTUs to cool my home? Calculate cooling load for Canadian summers and size your AC correctly.
Open calculator