About this Website

You have accessed this website because you are interested in purchasing high performance windows or low-e storm windows that are available through a U.S. Department of Energy (DOE) volume purchase program.

High performance (R-5*/U-factor 0.22 or less) windows and low-e storm windows are available for purchase through this website from a number of vendors who have qualified to participate in the volume purchase program.

Each qualified vendor of windows products on this site has met the minimum specifications established by DOE. The qualified vendors have agreed to sell window products to customers that meet the minimum purchase quantities shown.

Customers should be aware that not all vendors offer all window types nor do all vendors sell to all parts of North America. This website will assist purchasers to identify windows products and vendors for their particular location and application. Please be aware that the prices shown for the window products are 'base' prices bid into the program and do not include delivery, installation, and other features such as grids. Vendors may also offer high performance (R-5/U-0.22) windows with other frame materials and/or colors, and the price for those windows may be different than the price offered through this program

Highly Insulating or Low-E Storm Windows Energy Savings Estimator

An energy savings estimator (Excel^®) is provided for users to evaluate the energy cost savings benefits of selecting highly insulating windows or low-E storm windows relative to common window or storm window options and, if applicable, relative to existing windows. These estimates allow comparison between highly-insulating windows with a U-factor of 0.22 and more common window options (double-pane windows with clear glass or low-E glass, including ENERGY STAR windows). Alternatively, low-E storm windows can be compared to storm windows with clear glass. Both highly-insulating windows and low-E storm windows can be compared to a choice of existing window types if existing homes are evaluated. A document giving an explanation of the functions and assumptions (PDF) is also provided.

Non-Endorsement Notice

Please note that hyperlink to vendor websites are provided only as a convenience and does not imply an endorsement of such website, entity, product, or service. Any access, use or engagement of, or other dealings with such website, entity, product, or service shall be solely at the user's own risk.