National Fenestration Rating Council develops and administers energy-related rating and certification programs that serve the public by providing fair, accurate and credible information on fenestration performance.

NFRC is a non-profit organization that administers the only uniform, independent rating and labeling system for the energy performance of windows, doors, skylights and attachment products. Their goal is to provide fair, accurate and reliable energy performance ratings so that:

  • Architects, builders, code officials, contractors, homeowners and others can compare different products and make informed product choices.
  • Building officials, state government employees and others involved in code development and enforcement can determine if products meet local codes.
  • Government- and utility-run energy efficiency programs can establish performance requirements and standards.
  • Manufacturers have a fair and level playing field to compare products and an accurate method of showing the energy benefits of new designs or technology.


NFRC Letter