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"  Many new windows have &amp;quot;low-emissivity&amp;quot; metal-oxide coatings that block infrared rays and reflect heat. To improve older windows, apply an aftermarket low-E film. Flipped one way, it is ideal for keeping solar radiation out in hotter regions; turned the other way in colder climes, it does a better job of reflecting heat back inside. Handy DIYers can also build the passive solar window heater shown here. The glass-topped box is divided into two compartments. Convection draws sun-warmed air from the top compartment into the room, while cool air moves to the bottom of the box. "^^<http://www.w3.org/2001/XMLSchema#string>
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