Final answer:
True. Heat pump thermostats generally require two stages of heating in order to control. In colder temperatures, when the heat pump is not able to efficiently extract enough heat from the outside air, a second stage of heating may be used to supplement the heat pump's capacity.
Step-by-step explanation:
True. Heat pump thermostats generally require two stages of heating in order to control. In a heat pump system, the first stage of heating is typically provided by the heat pump itself. However, in colder temperatures, when the heat pump is not able to efficiently extract enough heat from the outside air, a second stage of heating, such as electric resistance heating, may be used to supplement the heat pump's heating capacity.