A pool heat pump is a cost effective method of heating your pool or spa. Your pool heat pump will provide you with years of pool enjoyment. Your new heat pump takes heat from the surrounding air and transfers it into the water. The warmer the air and the more humid the air, the more heat is available for heating your pool. The ideal or rated condition for the heat pump is 80 F air temperature, 80% relative humidity, and 80 F water temperature. This is true with all air source pool heat pumps. Under ideal conditions, a properly sized heat pump should raise your pool temperature 1 F. per hour. As air temperature and humidity decrease, performance will also decrease.