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What is a Solar Heat Gain Coefficient?

the higher the SHGC, the number, the greater the solar gain
Let the sun shine in, or not. The Solar Heat Gain Coefficient (SHGC) measurement can help you achieve a desired increase or decrease in the amount of solar radiation (heat) passing through a window into your home.

Understanding visual transmittance in windows

Understanding Visible Light Transmittance
The amount of light you let into your home is a matter of personal taste. When replacing your windows, understanding the VT will help you get it right.