With summer just around the corner it may be time to think about replacing your inefficient windows. Better Homes and Gardens had a great article in their March 2009 issue about the things to look for in purchasing new energy-efficient windows, here is what they said:
"The national Fenestration Rating Council evaluates performance in five categories, you can use this information when comparing windows:
U-Factor: This value, which measures heat transfer, ranges from .25 to 1.25. The lower the number, the better the window insulates. (You may hear the term R-value, which measures heat resistance and should be a high number. Is is more accurately reserved for materials such as insulation, roofing, and siding.)
Solar Heat Gain Coefficient: The lower the number (typically .25 to .8), the better the window blocks heat gain.
Visible Transmittance: Measured on a scale of 0 to 1, this category describes the amount of light the window lets through. The higher the number, the better.
Air Leakage: The lower the value (measured in cubic feet of air passing through one square foot of window area per minute), the better. this number should be .3 or less.
Condensation Resistance: This term refers to a window's ability to resist water buildup; the higher the number between 0 and 100, the better. A window that bears an Energy Star label has received high marks for U-factor and solar heat gain coefficient from the Department of Energy and the U.S. Environmental Protection Agency.
See which windows are best for your climate zone and whether or not you are eligible for a federal tax credit for your new windows at energystar.gov. You may also qualify for state rebates; see dsireusa.org.
If you are not ready to replace your windows, make them more efficient by installing insulating coverings, such as cellular shades, curtain panels with interlinings and window films. In warm-weather months, be willing to keep your windows covered during the sunniest times of the day."
Hope this information helps!
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