All rights reserved. NFRC, the country's only independent source of window, door, and skylight energy performance information, is strictly voluntary.
Most manufacturers understand that energy performance is important to their customers.
A national survey conducted by NFRC confirmed that consumers consider energy performance to be the single most important factor in deciding which windows to buy. The survey also found that 84 percent of consumers would prefer to buy a product whose energy performance is certified by an independent rating agency over one that is not certified. Manufacturers seeking to acquire energy performance ratings for their products contact NFRC-accredited simulation laboratories. These simulation laboratories use advanced computer tools to determine product performance ratings. To become accredited, each laboratory must demonstrate competence in the computer programs used in the rating system and meet strict independence criteria.