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Permanently attached openable interior storm window viewed from the side; outside of home is to right, interior storm pane is on right.

Permanently attached openable interior storm window viewed from the side; outside of home is to right, interior storm pane is on right.

CAD File

This thermal image of an interior storm window shows how much temperature change occurs between the interior storm window panel on the right, at 50F and the existing glass on left at approximately 0F

This thermal image of an interior storm window shows how much temperature change occurs between the interior storm window panel on the right, at 50F and the existing glass on left at approximately 0F

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Interior storm windows have very little impact on the appearance of the window, although the window frame may appear slightly wider

Interior storm windows have very little impact on the appearance of the window, although the window frame may appear slightly wider

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These interior storm windows have low-emissivity coatings to let in light while keeping out heat in the summer and keeping heat in in the winter

These interior storm windows have low-emissivity coatings to let in light while keeping out heat in the summer and keeping heat in in the winter

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Modern interior storm windows include new technology and sleek design features that offer an easy-to-install, cost-effective method for upgrading the energy efficiency of existing windows

Modern interior storm windows include new technology and sleek design features that offer an easy-to-install, cost-effective method for upgrading the energy efficiency of existing windows

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Low-E Exterior Storm Windows

Guide

Guide describing how to install low-emissivity exterior storm windows.

Windows Have Impact-Rated Glass, Fire-Resistant Glass, or Protective Coverings

Guide

Guide describing how to strengthen or protect windows against wind and wind-borne debris during high-wind events including hurricanes and tornados.