Windows are rated in several categories that establish their energy efficiency. If you are shopping for windows for your house, extra emphasis should be placed on various ratings based on the climate the home is located in. For instance, if you are looking for replacement windows in Phoenix, Arizona, a sunny and warm environment, the Solar Heat Gain Coefficient is very likely the most essential rating to take into account. Other characteristics, such as the orientation of a window to the sun and the amount of shade that is present ought to be considered.

The United State Government's Energy Star program is specially designed to make it convenient for individuals to identify energy efficient products and practices which will save them money and safeguard the environment. The Energy Star program scores over sixty products, including windows. Energy Star certification makes it convenient for shoppers to be certain that they are getting energy efficient replacement windows.

All Energy Star replacement windows are ranked in five areas but Energy Star qualification is solely determined on the U-Factor and Solar Heat Gain Coefficient. These ratings are also the categories used to determine if a window qualifies for the IRS Energy Tax Credit.

U-Factor
Determines the pace of heat transfer and illustrates how efficiently a window insulates. The smaller the U-Factor rating, the more efficiently a window insulates. The window U-Factor includes the thermal attributes of the frame and the glazing.

Solar Heat Gain Coefficient (SHGC)
Measures the solar energy transferred by the window and illustrates how effectively a window blocks heat caused by the sun. The smaller the SHGC, the less solar heat a window transmits.

Visable Transmittance (VT)
Determines the amount of light a window allows through. The higher the Visable Transmittance, the the more light that is allowed through.

Air Leakage (AL)
Determines the pace at which air passes through joints in a window. Air Leakage is determined in cubic feet of air that passes through 1 square foot of window area in a minute. The smaller the Air Leakage value, the less air leakage.

Condensation Resistance
Determines how efficiently a window prevents water build-up. The higher the Condensation Resistance factor, the less condensation build-up a window permits.

Other Replacement Window Ratings
There are a few alternative ratings which are not presented on the NFRC Energy Star label but they are beneficial and show up on some windows.

Light to Solar Gain
The ratio of Visable Transmittance to Solar Heat Gain Coefficient determines the amount of light transmitted without adding heat. A greater number signifies that more light is transmitted without adding heat.

R-Value
R-Value was developed as a way to measure the insulation value of a product. It determines conductivity and tells us the resistance to heat flow. A high R-Value implies a better insulated window. Virtually all windows today are measured using U-Factor (see above).

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