Keystone is a leading EPA-Recognized Certification Body (CB) working to qualify a wide range of products for listing in the ENERGY STAR® program.
Keystone is a National Fenestration Rating Council
(NFRC) licensed Inspection Agency (IA). The NFRC Certification
Program offers
fenestration (window and door) manufacturers a third party verified,
nationally-recognized method for demonstrating product U Factor, Solar Heat
Gain Coefficient (SHGC) and other energy performance characteristics.
Keystone's StarGuardTM Energy Performance
Certification Programs
qualify a variety of products for the EPA's ENERGY STAR®
Program, including: