the measure of how much of solar radiation passes through the window
is expressed as a number between 0 and 1–an SHGC rating of 0.30 means that 30% of the available solar heat can pass through the window
in cooling climates, higher SHGC value will be more advisable as a high SHGC allow a greater amount of solar radiation which will heat up home or building quicker
in heating climates, a lower SHGC value will be preferable to block unwanted solar radiation
in mixed climates, the objective is to stop heat from entering the home during summer and from escaping during winter. To achieve this, good choice would be mid to high range SHGC for north-facing windows and low SHGC for east and west-facing walls.
