2. What is a swimming pool heat pump and how does it compare to other pool heaters?

A swimming pool heat pump removes "FREE HEAT" from the air and transfers it to the freon via an evaporator. The heated freon passes through the heat exchanger where the heat is transferred to the pool water. The main reason heat pumps are becoming so popular is that they are efficient and effective, offering very significant operating costs savings compared to fossil fuel heaters.