How to Read a Window Label

NFRC Window Label

The National Fenestration Rating Council (NFRC) certifies windows and provides energy performance labels that help you determine how well windows are constructed. The information on the label allows you to compare one window to another and make informed decisions about the windows you buy.

The current label, adopted in 2005, lists the manufacturer, describes the product, provides a source for additional information, and includes ratings for energy performance characteristics. Because the label can be confusing, this slideshow breaks it down and describes what each rating means. So the next time you buy windows, you can do it with confidence.