Final answer:
An emergency heat setting at the thermostat activates a backup heat source when the main heating system is not working properly. It is temporary and typically used in situations like a malfunctioning heat pump or extremely cold temperatures. It should be resolved quickly to avoid higher operating costs.
Step-by-step explanation:
An emergency heat setting at the thermostat indicates that the primary heating system is not functioning properly and an alternative heating method is being used. This setting activates a backup heat source, typically electric resistance heat, to provide warmth when the main system is not working.
For example, in a house with a heat pump system, the emergency heat setting bypasses the heat pump and directly activates the electric heating elements. This setting is used in situations such as when the heat pump is malfunctioning or when the outside temperature is extremely cold and the heat pump alone cannot provide sufficient heating.
It is important to note that the emergency heat setting should only be used temporarily, as it can be more expensive to operate than the main heating system. It is recommended to have any issues with the primary heating system resolved as soon as possible to avoid relying on emergency heat for extended periods.