Modern heat pumps can work down to 0F https://homeinspectioninsider.com/heat-pump-work-subzero-temperatures/ https://homeinspectioninsider.com/heat-pump-work-su

Modern heat pumps can work down to 0F https://homeinspectioninsider.com/heat-pump-work-subzero-temperatures/ https://homeinspectioninsider.com/heat-pump-work-subzero-tem... Denver pretty much never gets that cold. Most of the continental US doesnt ever get that cold.