Source: http://www.thriftyfun.com/tf36813054.tip.html

Save Energy with Swimming Pool Covers

You can significantly reduce swimming pool heating costs by using a pool cover. Swimming pools lose energy in a variety of ways, but evaporation is by far the largest source of energy loss. Evaporating water requires tremendous amounts of energy. It only takes 1 Btu (British thermal unit) to raise 1 pound of water 1 degree, but each pound of 80 degree F water that evaporates takes a whopping 1,048 Btu of heat out of the pool. (Source: US Department of Energy)
Source: http://www.thriftyfun.com/tf36813054.tip.html
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