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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.
1 Solar Covers heat the water quickly during the day, and help keep the water warm at night.  In dry, windy climates, the cover should be left on during the day. In warm, humid climates, the cover should be left off during the day and used at night to retain heat.