Those figures may cause initial sticker shock, but consider the fact that upgrading old single-pane windows to Energy Star-rated windows can reduce your monthly utility bills by 15%, according to ...

Energy Star-qualified windows can lower your energy ... Look at the overall scores in our window Ratings, then zero in on test results that apply to where you live. If your home is exposed to ...

Windows also have an R-value. Single-pane windows have an R-value of 1, while Energy Star–rated windows typically have an R-value of 3. When properly installed, an insulated curtain can increase ...