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Energy Efficient Window Ratings


Windows are rated in a range of categories that calculate their energy efficiency. If you are choosing windows for your house, greater emphasis should be placed on various ratings based on where the home is located in. For example, if you are shopping for replacement windows in Phoenix, Arizona, a sunny and warm climate, the Solar Heat Gain Coefficient is most certainly the most significant rating to think about. Other criteria, such as the orientation of a window to the sun and any shade that is present should certainly be taken into consideration.

The U.S. Government's Energy Star program is meant to make it easier for consumers to identify energy efficient products and practices that will save them money and preserve the environment. The Energy Star program rates over sixty products, including windows. Energy Star certification makes it very easy for people to ensure they are getting energy efficient replacement windows.

All Energy Star replacement windows are rated in five areas however Energy Star qualification is based only on the U-Factor and Solar Heat Gain Coefficient. These ratings are also the categories utilized to calculate if a window qualifies for the IRS Energy Tax Credit.

U-Factor
Measures the rate of heat transfer and shows how effectively a window insulates. The lower the U-Factor rating, the more effectively a window insulates. The window U-Factor incorporates the thermal attributes of the frame together with the glazing.

Solar Heat Gain Coefficient (SHGC)
Determines the solar energy transmitted by the window and denotes how effectively a window inhibits heat caused by sunlight. The smaller the SHGC, the less solar heat a window transmits.

Visable Transmittance (VT)
Measures the amount of light a window allows through. The greater the Visable Transmittance, the more light you see.

Air Leakage (AL)
Measures the pace at which air passes through joints in a window. Air Leakage is calculated in cubic feet of air passing through 1 square foot of window area per minute. The smaller the Air Leakage value, the less air that is permitted to leak.

Condensation Resistance
Measures how well a window prevents water build-up. The greater the Condensation Resistance factor, the less condensation build-up a window allows.

Other Replacement Window Ratings
There are a few other ratings which are not incorporated on the NFRC Energy Star label yet they are helpful and appear on some windows.

Light to Solar Gain
The ratio of VT (see above) to SHGC (see above) calculates the amount of light that is transmitted without adding heat. A greater number suggests that more light is transmitted without adding heat.

R-Value
R-Value was formulated as a way to rate the insulation value of something. It determines conductivity and shows the resistance to heat flow. A high R-Value means a better insulated window. The majority windows today are measured using U-Factor (see above).

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