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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.
However, it really depends on your solar cover for your pool and the weather. The solar cover on the pool helps to keep the water from evaporating. Evaporation is the largest energy loss a pool can take therefore leaving the pool at cooler temperatures. The amount of evaporation is determined by several factors.