What is em heat on thermostat?

EM heat on a thermostat stands for Emergency Heat. This setting is typically used when the heat pump is not functioning properly and the backup heat source needs to be activated to keep the home warm. Emergency heat is typically provided by electric resistance heat strips or a gas furnace.

When the EM heat setting is activated on the thermostat, it bypasses the heat pump and only uses the backup heat source to heat the home. This setting should only be used in emergency situations as it can be more expensive to operate compared to the heat pump.

It is important to have a professional HVAC technician check and repair the heat pump as soon as possible if the EM heat setting needs to be used regularly. Using the emergency heat setting for an extended period of time can result in higher energy bills and potential damage to the system.