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Swimming pool cover
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Swimming pools gain heat naturally during the day by absorbing the infrared radiation from the sun. The heat gain by the sun can be increased by using a solar cover since such a cover will let the sunlight penetrate the pool through its transparent surface and keep reflected sunlight from the pool bottom within the pool by reflecting it back to the pool-bottom (the bottom side of the solar cover is reflecting). This way solar-covered outdoor pool gains almost twice the amount of the sun's energy than a screened or uncovered pool gains. The net result in periods of sunshine with a solar cover is a pool that is 6-8 °C warmer than its screened counterpart.
This additional heat gain is free and should not be wasted.