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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.
How to Warm Your Pool with a Solar Cover. Solar Power Your Home For Dummies, 2nd Edition. The cheapest and most effective solar-heating system for your swimming pool is a solar cover. You can get one for around $0.30 a square foot, so covering an average size pool costs about $130.