Solar Heat Gain Coefficient
A measure of how much solar radiation passes through a window -expressed as a number between 0 and 1.
Why It Matters for Homeowners
Why it matters: SHGC is the rating that matters most in Southern California. A low SHGC (under 0.25) keeps a house cooler in summer, reduces AC load, and protects flooring and furniture from sun damage. West and south-facing windows benefit most. Title 24 for LA climate zones typically requires SHGC at or below 0.25, and the rating is printed on the NFRC label that ships with every new window.
Related searches: SHGC, solar heat gain, window solar rating