Efficient Windows Collaborative (EWC) members have made a commitment towards manufacturing and promoting energy efficient windows. EWC is now powered by the National Fenestration Rating Council (NFRC) and we are looking forward to continuing to work with you. NFRC is committed to advancing continuous improvement of windows, doors, and skylights, contributing to making buildings more comfortable and energy efficient.

Any application submitted before October 2020 will be processed and added to the EWC member list as soon as possible. Starting in 2021 all EWC members will have a choice on how they would like to maintain their membership with EWC/NFRC.

Click here to learn more about NFRC membership. You can also learn more about NFRC membership in this brief webinar.

For more questions about EWC and membership please email