A Guide to Energy-Efficient Windows and Doors

We hope you find this information both informative and beneficial in your pursuit of the highest quality windows and doors. If you have questions about our products and are building in the Chicagoland or Suburban Chicagoland area, please give us a call at 847-234-3302 to discuss your needs.

Great care and research has gone into this document to assure accuracy and relevancy. The data either came from the companies cited or a government publication. A special thanks goes to Canada's Office of Energy Efficiency, the NFRC, and Southwall Technologies for their valuable input.

Much of this information is taken, with permission, from the Consumer's Guide to Buying Energy-Efficient Windows and Doors , produced by Natural Resources Canada. Information from Canadian testing agencies has been replaced with information from the U.S. equivalent, the National Fenestration Ratings Council (NFRC).