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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.
Therefore, there is no right or wrong answer for this particular question about solar covers during the day. The only thing to make sure you do is to apply the cover when night falls to keep in the heat for the following day. 1  AquaQuick Above Ground Solar Pool Heater.  Fafco Deluxe Above Ground Pool Solar System.