Windows

Windows can account for 10% to 25% of your heating bill. During the summer, sunny windows make your air conditioner work two to three times harder. If your home has single-pane windows, consider replacing them. New double-pane windows with high-performance glass are available on the market.

ENERGY SAVING TIPS:

Cold Climate:

Install exterior or interior storm windows; storm windows can reduce your heat loss through the windows by 25% to 50%
Repair and weatherize your current storm windows, if necessary
Install tight-fitting, insulating window shades on windows that feel drafty after weatherizing
Close your curtains and shades at night; open them during the day
Keep windows on the south side of your house clean to maximize solar gain

Warm Climate:

Install white window shades, drapes, or blinds to reflect heat away from the house
Close curtains on south-and west-facing windows during the day
Install awnings on south-and west-facing windows
Apply sun-control or other reflective films on south-facing windows to reduce solar gain

SHOPPING TIPS:

Remember, the lower the U-value, the better the insulation. In colder climates, a U-value of 0.35 or below is recommended
Select windows with air leakage ratings of 0.3 cubic feet per minute or less
In temperature climates with both heating and cooling seasons, select windows with both low U-values and low solar heat gain coefficiency (SHGC) to maximize energy benefits
Look for the ENERGY STAR and EnergyGuide labels

Exterior window shade over window on house.