The air passes over an evaporator coil, and the heated refrigerant transfers the heat to the water returning back into your pool. This process does not require natural gas or propane resources, which lowers running utility costs drastically. Heat pumps cost about $0.63 an hour to run on electricity; a fraction of the cost of propane or natural gas.
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Average Energy Costs to Run a Pool Heater a year
10 Year Compounded Pool Heating Costs and Solar Savings
Heat Pump Pool Heaters Running Costs