If you have an outdoor heated pool, use a pool cover. It will not only reduce the amount of water lost to evaporation but will lower heating bills and save on chemical usage.
By covering your pool when it's not in use you could see energy savings of up to $75-$200 per month, depending on your climate and pool size.
If every heated backyard pool in the U.S. was covered when not in use, the total energy savings during the summer would be roughly 3.3 billion kilowattt hours (kWh) per month-more energy than is generated by the Hoover Dam in an entire year.
You feel this effect every time you throw open a few windows in the house: Natural ventilation moves air into and out of a building through passive means-using forces such as wind and pressure differences-instead of mechanical air-conditioning systems or fans. Strategically placed windows and vents provide air supply and exhaust. Good natural ventilation can save energy and improve indoor air quality. Not only an option at home, natural ventilation is increasingly being incorporated into commercial HVAC systems as an energy-saving technique, for example by allowing fresh outdoor air in during the coolest hours of the day.
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