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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.
These covers can be made for inground or above ground pools and they are often a thick blue insulated material. The low-end price for these covers is $139, but professional installation and high-quality solar warmth may cost as much as $1,305.