Energy Performance Ratings for Windows, Doors, and Skylights
Energy performance ratings make it easier to shop for energy-efficient windows, doors, and skylights.
National Fenestration Rating Council | NFRC is the leader in energy ...
The National Fenestration Rating Council (NFRC) is the trusted, independent, nonprofit certification body for the energy performance of windows, doors, and skylights. NFRC certification ensures that …
Window Ratings - NFRC Consumer Guide to Windows
Know how to buy energy-efficient windows with window ratings. Find out about window ratings certifications, ENERGY STAR® program, and more.
Understanding Window Ratings: U-Factor, SHGC, and VT Explained
Specific window ratings that are designed to measure their energy-efficiency performance. Key window ratings include U-Factor, SHGC, and VT. Call APCO.
Window Ratings Explained: Updated 2025 - Get the Real Info Here.
Real information on replacement window ratings. What to look for, how to avoid common pitfalls and how to interpret all of the various window ratings.
Independently Tested and Certified Energy Performance
Performance Ratings The NFRC label can be found on all ENERGY STAR certified windows, doors, and skylights and provides performance ratings in five categories: U-Factor measures the rate of heat …
What Are Different Window Ratings And What They mean
Aug 21, 2023 · Window ratings are a measure for window performance. Learn about different window ratings, what they mean and their significance for your home.
U-Factor Ratings for Windows - InterNACHI
The performance rating of the glazing alone, independent of the frame, is known as the center-of-glass U-factor, but use of this rating is less common. For most energy-efficient windows, the U-factor for …
Window Energy Performance Ratings Chart
Oct 1, 2025 · Confused by window energy ratings? We explain what U-Factor, SHGC, and other characteristics mean & how to choose energy-efficient windows for your climate.
7 Window Energy Ratings To Understand Before Buying Home …
May 2, 2025 · Discover the 7 key window ratings—U-Factor, SHGC, UV, VLT, Infrared, Air Infiltration, and Condensation Resistance—to choose the best windows.