Question

a building design was complete and is under construction. You had selected a window with a U-value of 1.6 and a solar heat gain coefficient (SHGC) of 0.25. The window manufacturer informs you that they no longer carry that window model, but that they can give you a window with a U-value of 1.6 and SHGC of 0.4.

How would this new window impact your building's modeled heating and cooling energy consumption?

Answer 1

SHGC is short for solar heat gain coefficient, a number that represents the amount of solar radiation through a window. It’s measured between 0 and 1; a lower number means less solar heat transfer.

U-factor, or U-value, is a term that’s given when estimating the heat loss of a window. Windows with lower values provide greater insulation and heat resistance, helping to keep the interior at the proper temperature and to reduce overall energy costs.

Reference : https://www.google.com/amp/s/www.hunterdonsiding.com/blog/u-factor-and-shgc-how-they-impact-your-windows/amp/

Here U-value remains same but SGHC increases from 0.25 to 0.4 i.e. more solar heat transfer.