Efficient Windows Collaborative (EWC) members have made a commitment to manufacture and promote energy-efficient 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. Take a look to learn more!


  • The EWC has developed toolkits for manufacturers, designers, and builders who seek to provide their customers with low energy costs and comfort through efficient windows. See toolkits»
  • Claim a tax credit for installing energy efficient windows in your home. On February 21, 2006, the Internal Revenue Service released a guideline detailing how the tax credit works. Learn more»
  • Word on Windows winter newsletter is now available. View now»
  • Let utilities help you finance more energy-efficient windows for your home. Download an overview of Utility Programs that Offer Incentives and Rebates for Energy-Efficient Windows»
  • Decision makers in the low-income housing sector can find options for financing energy efficiency measures through this web portal presented by the EWC. Download "Improving Energy Performance in Low-Income Housing"
  • The Efficient Windows Collaborative is excited to announce the launch of a new database of efficiency initiatives including tax incentives, building code changes and legislative initiatives. See what's going on in your state»

Efficient Windows Collaborative