ELECTRIC HEAT PUMP USERS!!!! The Role of the “Emergency Heat” Setting on your Thermostat is to only be used when the outdoor heat pump is not working properly. This allows the furnace to run and heat the home until a technician can fix your Heat Pump! If you switch your heat pump unit to this setting just because it is cold outside, it will cost you more money to heat your home!!!! So please make sure you are using your Emergency Heat Setting controls correctly!!!!