Efficient Windows: Glass

Characteristics of Low-E Glass

Low solar heat gain low-E glass can cut more than half of solar heat gain and heat loss while letting most daylight through. In order to be sure that your windows have low solar gain low-E glass, demand a labeled SHGC less than or equal to 0.25.

For additional information on this topic, please consult the Low-E Coatings and Glazing Types sections of the Efficient Windows Collaborative website.