- Look for the ENERGY STAR® label.
- Check with local utilities to see what rebates or other incentives are available for window replacement.
- Choose high-performance windows that have at least two panes of glass and a low-e coating.
- Choose a low U-factor for better insulation in colder climates; the U-factor is the rate at which a window, door, or skylight conducts non-solar heat flow.
- Look for a low solar heat gain coefficient (SHGC)-this is a measure of solar radiation admitted through a window, door, or skylight. Low SHGCs reduce heat gain in warm climates.
- Select windows with both low U- factors and low SHGCs to maximize energy savings in temperate climates with both cold and hot seasons.
- Look for whole-unit U-factors and SHGCs, rather than center-of-glass (COG) U-factors and SHGCs. Whole-unit numbers more accurately reflect the energy performance of the entire product.
- Have your windows installed by trained professionals according to manufacturer's instructions; other- wise, your warranty may be void.
- Consider windows with impact- resistant glass if you live along a coast or in areas with flying debris from storms.