Heat Pumps in Freezing Temperatures: Complete Winter Performance, Defrost & Backup Heating Guide By Tony Marino | Tony the Trusted TechThe Furnace Outlet | Updated October 2026 A heat pump that performs beautifully during a mild October afternoon faces a different challenge when January temperatures fall below freezing. The outdoor coil becomes colder, frost may … Continue reading Heat Pumps in Freezing Temperatures: Complete Winter Performance, Defrost & Backup Heating Guide