popoeliz

Do you mean heat pump or reverse cycle air conditioning? They are just air conditioning that works in winter and summer.

Evaporative cooling system is the only one that would suck fresh air in ...

popoeliz

There is one different between heat exchanger, heat pump or reverse cycle AC; against air conditioning. It is the heating function.
Most countries in asia does not need heater but typical high efficient AC, is pretty close to the price of a reverse cycle AC.