High-Performance Windows

Modern choices can save you money on heating and cooling your home.



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This cross section shows the construction of energy-efficient windows that protect your home against outside temperatures.
Courtesy U.S. Department of Energy
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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. Estimates use August 2004 state average utility rates. Actual savings will vary by region and home characteristics. For more information about this chart, go to www.energystar.gov/windows.
Courtesy U.S. Department of Energy
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Modern choices can save you money on heating and cooling your home.
Courtesy Andersen Windows
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Clear window (left) versus low-e coated, argon gas-filled window; both double-pane, 32-degree exterior. Scientists at the Lawrence Berkeley National Lab use thermal imaging to show heat gain and loss on window materials. For more information about these images, go to the lab’s thermal imaging Web page (windows.lbl.gov/facilities/irlab/therms.html). All temperatures are listed in Fahrenheit.
Courtesy Lawrence Berkeley National Lab
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Modern choices can save you money on heating and cooling your home.
Courtesy Andersen Windows
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Clear glass (left) versus low-e coated; both double-pane, 32-degree exterior. Scientists at the Lawrence Berkeley National Lab use thermal imaging to show heat gain and loss on window materials. For more information about these images, go to the lab’s thermal imaging Web page (windows.lbl.gov/facilities/irlab/therms.html). All temperatures are listed in Fahrenheit.
Courtesy Lawrence Berkeley National Lab
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Double-pane (left) versus single-pane; both 32-degree exterior. Scientists at the Lawrence Berkeley National Lab use thermal imaging to show heat gain and loss on window materials. For more information about these images, go to the lab’s thermal imaging Web page (windows.lbl.gov/facilities/irlab/therms.html). All temperatures are listed in Fahrenheit.
Courtesy Lawrence Berkeley National Lab











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