Heatpump efficiency is quoted versus heating with resistive electric heaters. In northern europe most modern houses are heated by heatpumps and good ones achiev

Heatpump efficiency is quoted versus heating with resistive electric heaters. In northern europe most modern houses are heated by heatpumps and good ones achieve 5-6x efficiency as opposed to "dumb" electric heating. It's basically a reverse fridge - you cool down outside and dump the collected heat inside. When outside temps drop the efficiency drops dramatically though. Google "heat pump COP curve"