Pick the Right Window for You

Try the Window Selection Tool

Windows for every season

Benefits: Energy & Cost Savings

Discover Window Matters: Read, Enjoy, Share!

Window Matters Blog

Prevent cold drafts from entering your home

Window Buying Guide

Find the best energy-efficient windows for your home in just a few clicks with the Window Selection Tool.

This searchable database helps you compare different window types and options to find the ones that are right for your home and climate. You’ll also find unbiased information from the National Fenestration Rating Council on the technologies behind energy-efficient windows and the benefits they offer.

Let’s get started

Annual EWC Sponsors

Expand your reach to new audiences and support the Efficient Windows Collaborative with your sponsorship.

About Us

provides unbiased information and education to the public on the energy efficiency, technical, and human considerations that influence window selection and use. The EWC collaborates with allied organizations, educational institutions, and government agencies that promote energy efficiency in residential windows. We do not sell, service, install, or recommend products, or endorse manufacturers. Descriptions and specifications of the products in the Window Selection Tool are provided by the manufacturer. The EWC is not liable for any manufacturing defects or inaccurate product descriptions and specifications and does not guarantee the performance of NFRC-certified windows, doors, and skylights.

Contact Us
National Fenestration Rating Council
6305 Ivy Lane, Suite 410
Greenbelt, MD 20770
Follow Us
Learn more about us at : www.nfrc.org