What Is the Solar Heat Gain Coefficient?

The solar heat gain coefficient, or SHGC, rates the energy efficiency of a window. SHGC is a ratio that measures how much solar heat is allowed through the window. An SHGC of one means the window transmits the maximum amount of solar heat, while a rating of 0.5 means only 50% of incident solar heat is transferred. The SHGC rating includes the entire window: glass, frame, and spacers. Choosing a window with the appropriate SHGC for your home’s climate will depend upon the average temperatures and how long they last each year. If your home is in a cooler climate, you may want to choose a window that transmits more solar heat to save on heating costs. Conversely, if you live in a warmer climate, you may select windows with a lower SHGC to keep your home cooler and more comfortable. The window experts at Wallside Windows can help you understand your home’s window needs to maximize energy efficiency. Check out our website for a listing of the window types we offer throughout Michigan and northern Ohio. Call (313) 908-5243 to speak with a representative.