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 air conditioning bills. Energy efficient windows in Texas should have a solar heat gain coefficient (SHGC) of 0.30, although SHGC values of 0.25 and lower are preferable.
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.
Use a window system with a low-E coating on the glass that is designed to block solar heat gain. Low-E glass is a specific type of glass that lowers solar heat gain while allowing most of the visible light to enter.
For a description of the key components that make up an energy efficient window system, select a topic below: