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Sources: U.S. Department of Energy. Update or Replace Windows. Retrieved from [https://www.energy.gov/energysaver/update-or-replace-windows](https://www.energy.gov/energysaver/update-or-replace-window … read more

Source: U.S. Department of Energy & Lawrence Berkeley National Laboratory. Energy Savings from Window Attachments. Retrieved from [https://www.energy.gov/sites/prod/files/2013/11/f5/energy_savings_fro … read more

Sources: U.S. Department of Energy. Update or Replace Windows. Retrieved from [https://www.energy.gov/energysaver/update-or-replace-windows](https://www.energy.gov/energysaver/update-or-replace-window … read more

Sources: U.S. Department of Energy. Windows, Doors, and Skylights. Retrieved from [https://www.energy.gov/energysaver/windows-doors-and-skylights](https://www.energy.gov/energysaver/windows-doors-and- … read more

Source: U.S. Department of Energy. Energy Efficient Window Coverings. Retrieved from [https://www.energy.gov/energysaver/energy-efficient-window-coverings](https://www.energy.gov/energysaver/energy-ef … read more