Honeywell CT70 Owner's Manual - Page 7
Heat Pumps Are Two Systems In One
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HEAT PUMPS ARE TWO SYSTEMS IN ONE OUTDOORS MILD WEATHER INDOORS OUTDOOR AIR AUXILIARY HEATING ELEMENT OFF INDOOR AIR HEAT TRANSFER M9069 In mild weather, virtually all of the demand for heat in buildings can be met by the heat pump compressor. This First Stage process of moving heat indoors is very economical. As the air becomes colder outside, the first stage may be unable to deliver enough heat to maintain the desired comfort level in the building. OUTDOORS SEVERE WEATHER INDOORS OUTDOOR AIR AUXILIARY HEATING ELEMENT ON INDOOR AIR HEAT TRANSFER M9078 During high heat demand, the thermostat will call for additional Second Stage power from the auxiliary heat system. This auxiliary heat is commonly electric resistance heat and is two to three times more expensive to operate than the compressor. If you have specific questions concerning the operation of your heat pump, please contact the equipment manufacturer. 7