Find The Right Window For Your Home

Lower Your Energy Bill with Efficient Windows

Comfort You Can Trust

Stay Cool in the Summer

High-Performing Windows Save Energy

Keep The Outside Out and the Inside In

Prevent Unwanted Heat From The Sun Entering Your Room

Stay Warm in the Winter

How to Choose Windows

This site provides unbiased information on the benefits of energy-efficient windows, descriptions of how they work, and recommendations for their selection and use.

Window Selection Tool

This tool provides unbiased information from the National Fenestration Rating Council (NFRC) on the benefits of energy -efficient windows for new construction and replacement windows.

The Window Selection Tool will take you through a series of design conditions pertaining to your design and location. It is a step-by-step decision making tool to help determine the most energy efficient window for your house.

EWC is your ULTIMATE Source for Window Information

The Efficient Windows Collaborative (EWC) is powered by the National Fenestration Rating Council (NFRC), a nonprofit organization that provides independent energy-performance ratings for windows, doors, and skylights—often referred to as fenestration products. NFRC has a voluntary program that provides fair, accurate, and credible energy-efficiency ratings for fenestration products that helps consumers make informed purchase decisions.

The EWC provides unbiased information and education to the general 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.

Annual Sustainability Sponsors

Exclusive opportunities are available. Expand your reach and support NFRC’s sustainability efforts all year with annual sponsorship opportunities.