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Solar Covers heat your pool in two stages: first by absorbing solar energy to heat the pool, and then by retaining the heat to keep the water warmer longer. The small bubbles on the Solar Cover are filled with air that heats up when the cover is in the sun.
The downs Solar heating requires a system equal to 50%-100% of the pool's surface. While solar energy may be free, the pool pump must be running for the solar heater to properly operate which can increase your electric bill. Electric Heat Pump amazingly, the electric heat pump is actually a form of solar energy.