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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.
With a properly sized solar pool heater, a pool cover is not required to keep the pool at a comfortable temperature during the warm swimming season. However, a pool cover does help retain heat at night and prevent evaporation loss.