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The essential difference is that SHGC looks at a percentage of readily available solar heat instead of taking a look at a portion of what comes through a single pane of glass. It thinks about various sun angles and the shading impact of the window frame. As a result it has to do with 15% lower than SC values.

It is possible to have a glass covering that blocks long-wave heat energy (low SHGC) while enabling generous quantities of shorter wave light energy (high VT) to go into a home. Th...