Final answer:
During the cooling cycle, the indoor coil becomes colder.
Step-by-step explanation:
During the cooling cycle of a heat pump, the indoor coil becomes colder. The heat pump works by transferring heat from the indoors to the outdoors. The electrically driven compressor raises the temperature and pressure of the working fluid, which then flows through the condenser coils inside the heated space. As the gas condenses to a liquid, heat transfer occurs to the room, making the indoor coil colder.