hree people are installing equipment. Cyrus is installing a heating system, Aletta is installing a cooling system, and Francis is installing a cooling system. Which best describes the possible equipment they could install? Cyrus is installing an air conditioner, Aletta is installing a furnace, and Francis is installing a heat engine. Cyrus is installing a furnace, Aletta is installing a heat pump, and Francis is installing an air conditioner. Cyrus is installing a heat pump, Aletta is installing a thermostat, and Francis is installing a furnace. Cyrus is installing a thermostat, Aletta is installing an air conditioner, and Francis is installing a heat engine.