Efficient Windows
Characteristics of Energy Efficient Windows
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For a highly efficient window that will meet both the 2009 IECC and 2012 IECC in all Texas climate zones, we recommend selecting a window with no more than 0.35 U-Factor and no more than 0.25 Solar Heat Gain Coefficient. An energy efficient window in Texas is a window that reduces heat exchange, particularly the solar heat gain. Solar heat on windows is the biggest contributor to costly air conditioning bills. Energy efficient windows in Texas should have a solar heat gain coefficient (SHGC) of no more than 0.30, although SHGC values of 0.25 and lower are preferable. |
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What is solar heat gain coefficient?
SHGC is the fraction of solar heat transmitted through a window system. A window with a solar heat gain coefficient (SHGC) of 0.4 means only 40% of the heat from the sun is transmitted through the window.
How is solar heat gain reduced?
The installation of a low-E window system with a can significantly reduce solar heat gain while allowing most of the visible light to enter.
For a more detailed description of the key components of an energy efficient window system, please follow the links below:
For a more thorough description of high-performance window characteristics, we highly recommend that you visit the Efficient Windows Collaborative.
