Overview
The NFRC rating system provides consistent, reliable energy performance ratings that appear on all certified products. Ratings include U-Factor, Solar Heat Gain Coefficient (SHGC), and Visible Transmittance.
Key Ratings
- U-Factor — measures heat transfer; lower is better
- SHGC — measures solar heat gain; lower blocks more heat
- VT — measures visible light transmission
Code Requirements
NFRC ratings are referenced by ENERGY STAR, California Title 24, and most major building energy codes.
Details
Issuing BodyNational Fenestration Rating Council
RegionUnited States
ValidityLifetime of product