Many thermostats have a setting called EM heat, emergency heat or auxiliary heat. You shouldn’t normally rely on it warm your house, but it’s useful when the thermostat’s regular settings aren’t ...

This is because when a heat pump is in its heating mode, setting back its thermostat can cause the unit to operate inefficiently, thereby canceling out any savings achieved by lowering the ...

You shouldn’t normally rely on it warm your house, but it’s useful when the thermostat’s regular settings aren’t cutting it. In normal conditions, your heat pump is the primary worker.