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1The U.S. Department of Energy estimates you can save up to 10% on total energy costs (gas and electric) by weatherstripping windows and doors in your home, but your actual savings will depend on how well-sealed your home was in the first place, whether you seal all doors and all windows and other factors and conditions specific to your home. https://energy.gov/energysaver/projects/savings-project-how-weatherstrip-double-hung-or-sash-windows
2U.S. Department of Energy https://energy.gov/energysaver/weatherstripping