"Suburban installed windows three years ago and siding and doors last summer and we're very satisfied with the work they did. They are very professional, prompt and dependable. We obviously are very h... » more
- Steve and Vicki Engler of Bettendorf, Iowa


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Solar Heat Gain Coefficient (SHGC)

The fraction of solar radiation admitted through a window or skylight, both directly transmitted and absorbed and subsequently released inward. The solar heat gain coefficient has replaced the shading coefficient as the standard indicator of a window's shading ability. It is expressed as a number between 0 and 1. The lower a window's solar heat gain coefficient, the less solar heat it transmits and the greater its shading ability. SHGC can be expressed in terms of the glass alone or can refer to the entire window assembly.

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