Question

tina wants to install one unit that both heats and cools. which should tina install?
● an air conditioner
● a heat pump
● a heat engine
● a furnace

Explanation:

An air - conditioner is mainly for cooling. A heat engine is a device that converts heat into work. A furnace is mainly for heating. A heat pump can both heat (by reversing the refrigeration cycle to transfer heat into a space) and cool (by the normal refrigeration cycle to remove heat from a space).

Answer:

a heat pump