During heat pump operation, liquid freon from inside the unit is pumped
through the system and is turned into a heated gas. This happens when heat is taken from the surrounding air as it is drawn through the evaporator by the fan.
The compressor receives this warmer gas and compresses it to a higher
pressure, resulting in the freon reaching even higher temperatures. As the unit sends the heated gas through the heat exchanger, the gas gives up its heat to the surrounding water. The freon reverts to a liquid state as it gives up the heat to the pool water, which completes the cycle . The water , which is being forced through the heat exchanger by your pool pump, is heated by three to five degrees as it passes through and returned to your pool as heated water.
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