The Economics of Cold-Climate Window Film vs. Thermal Curtains

Single- and double-pane window assemblies represent one of the weakest links in a residential thermal envelope, responsible for up to 25% of overall space-heating conduction and air-infiltration losses during a Canadian winter. When exterior temperatures drop below -15C, the indoor surface temperature of standard glass plunges, inducing localized convective drafts and triggering persistent condensation along the sill. Mitigating this heat loss before peak heating bills arrive comes down to two p