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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.
Solar heating for swimming can be much less expensive than a gas heater or electric heat pump, a great solution in a sunny zone. A heat pump is ideal for use in conditions that aren't extreme, and gas or propane selections are more suitable for areas where swimming is planned during colder months.