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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

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

Sources: National Urban Security Technology Laboratory. Shatter-Resistant Window Film Market Survey Report. U.S. Department of Homeland Security, January 2015. U.S. General Services Administration. Pu … read more

Sources: City of San Diego Police Department. Small Business Security Survey. U.S. Department of Homeland Security. Shatter-Resistant Window Film Market Survey Report. Public domain. A City-Level Solu … read more