Heat pumps are two systems in one – Honeywell CT70 User Manual

Page 7

HEAT PUMPS ARE TWO SYSTEMS IN ONE

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.

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.

INDOOR

AIR

OUTDOOR

AIR

HEAT

TRANSFER

AUXILIARY

HEATING

ELEMENT

OFF

OUTDOORS

MILD WEATHER

INDOORS

M9069