Answer :
Final answer:
A heat-pump room air conditioner has all components of a traditional unit, plus a reversing valve. The reversing valve allows the system to operate in both heating and cooling modes, making it more versatile.
Explanation:
A heat-pump room air conditioner has all the major components of a cooling only unit with the addition of a reversing valve. The heat pump system uses this reversing valve to reverse the flow of the refrigerant, which allows the system to operate in both heating and cooling modes. In the cooling mode, the heat pump acts like a traditional air conditioner, removing heat from inside the room and expelling it outdoors. In the heating mode, the process is reversed, the unit extracts heat from the outside air and expels it inside the room.
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