Emergency heat is a supplemental heating mode in heat pump systems designed to provide warmth when the primary heat source is insufficient. Activation of this setting bypasses the heat pump and utilizes electric resistance coils to generate heat. This functionality serves as a backup system to maintain a habitable temperature in circumstances where the heat pump is unable to extract sufficient warmth from the outside air, typically during periods of extremely cold weather or system malfunction.
The implementation of emergency heat ensures continuous heating even when the efficiency of the primary heating system is compromised. Its existence provides a safety net, preventing potential discomfort or hazardous conditions during severe weather events or unexpected system failures. Historically, this feature has become a standard component of heat pump technology, recognizing the limitations of heat pumps in extreme cold climates and offering homeowners a reliable alternative.