COOLING MODE

The refrigerant flows through the indoor unit to absorb the excess heat indoors. It then evaporates and is carried through copper tubes to the outdoor unit as a gas, where the heat is released into the atmosphere. Thus, the gas becomes a liquid again and flows back to the indoor unit, where air is fanned over it and out into the room. This cycle is repeated until the preset temperature is reached.

HEATING MODE

Heat pump air conditioning units additionally allow the cycle described above to be reversed. A heat pump extracts "free" heat from the outdoor air and transfers the heat indoors. This principle even continues to function on very cold days with temperatures down to -4 �C on Proma units. Therefore, heat pump units eliminate the need for a heating system and allow you to cool and heat with the same unit, with savings in costs and energy throughout the year.