What is em heat on a thermostat?

EM heat, which stands for Emergency Heat, is a setting on some thermostats that allows you to manually switch to a backup heating system. This backup system is typically a secondary heat source, such as electric resistance heat, used when the primary heating system, such as a heat pump, is not functioning properly.

EM heat is designed to provide warmth in extreme situations when the primary heating system is unable to keep up with the demand for heat. It is important to note that using EM heat can be more expensive to operate than the primary heating system, so it should only be used when absolutely necessary.

To use EM heat on a thermostat, simply switch the thermostat setting to the EM heat mode. This will activate the backup heating system and provide a temporary solution until the primary system can be repaired or replaced. It is recommended to consult with a professional HVAC technician if you find yourself relying on EM heat frequently, as it may indicate a larger issue with your primary heating system.