Heat pump is essentially a "reverse mount of a refrigerator", putting heat in and throwing cold out. In the worst case, the pump will degrade into a heating ele

Heat pump is essentially a "reverse mount of a refrigerator", putting heat in and throwing cold out. In the worst case, the pump will degrade into a heating element, only outputting heat from electricity (which is what a regular electric heater does). Insulation is not a requirement, but will lower your energy needs to keep a steady temperature.