The summer sun penetrates windows and increases the ambient temperature in your home, forcing air conditioners to work harder. In other areas of the country, like the Sun Belt, the major concern is keeping homes cool in the warmer months. Windows can have a significant impact on home heating costs: In the colder parts of the United States, anywhere from 15 to 35 percent of heat loss in wintertime can be attributed to poorly insulated windows.
Those old single-pane windows provide only a thin glass barrier against the elements. Even if the cold air isn't leaking in through gaps, the window itself can make the indoor air cooler. Placing a hand near the window on a windy night can reveal - brrr! - the source of the draft. As the weather gets colder, you might start to notice a draft entering your bedrooms and kitchens from the windowsills.
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