Windows can be a key feature in a home. Windows provide sight, lighting, ventilation, and solar heating in the cold months. On the down fall side, they can also account for 10% to 25% of your heating bill. During the warmer months, your air conditioner must work harder to cool the hot air from sunny windows. The use of curtains and shade will give your air conditioner a brake. If you live in a warmer climate area, look into low-e windows, which can cut the cooling load by 10% to 15%.If you still have single-pane windows in your home, like most U.S. homes have, consider replacing them with new double-pane windows with high-performance glass. In the colder climates, select windows that are gas filled with low emissivity (low-e) coatings on the glass to reduce heat loss. In warmer climates, select windows with spectrally selective coatings to reduce heat gain. If you are building a new home, you can counteract some of the cost by installing more efficient windows because they allow you to buy smaller, less expensive heating and cooling equipment.
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