Window Energy Ratings Explained: U-Factor, SHGC, ENERGY STAR
Window energy ratings look like alphabet soup. This plain-English guide decodes U-factor, SHGC, and ENERGY STAR so you know exactly what you’re paying for.
NFRC label
Window energy ratings look like alphabet soup. This plain-English guide decodes U-factor, SHGC, and ENERGY STAR so you know exactly what you’re paying for.