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Replacing old windows saves energy and reduces CO2 emissions
Conservation January 2, 2020

At one time, single-pane windows were standard in residential settings. As a result, many older homes still have single-pane glass. Homeowners with single-pane windows should understand how they affect a home’s energy efficiency and their environmental impact.

Energy-efficient windows are an important consideration for both new and existing homes. Heat gain and loss through windows are responsible for 25%–30% of residential heating and cooling energy use, depending on the geographic region and climate.

The Environmental Protection Agency (EPA) ENERGY STAR program estimates that the average U.S. home can save $126 to $465 a year on heating and cooling costs when replacing single-pane windows with ENERGY STAR certified windows. This also saves the equivalent of 1,006–6,205 pounds of carbon dioxide (CO2) emissions due to lower electricity usage.

Electricity generated by fossil-fueled power plants is a leading cause of excessive CO2 in our atmosphere, which is directly linked to climate change. 

If you are selecting windows for new construction or replacing existing windows, it’s important to choose the most efficient windows you can afford that work best in your climate. For existing windows are in good condition, taking steps to reduce the energy loss through windows can make your home more comfortable and save you money on energy bills.

To learn more about updating or replacing your windows, visit the Energy Saver section of coalition member ENERGY.GOV.

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