High-Performance Windows

Modern choices and high-performance windows can save you money on heating and cooling your home.

Energy Efficient Windows
The annual cost and energy (in millions of British thermal units) savings for Energy Star-qualified double-pane windows over common single-pane windows, based on population-weighted regional average annual energy use for a 2,000-square-foot single-story house with 15-percent glazing, gas heat and electric air conditioning.
Photo courtesy U.S. Department of Energy