Definitions for "Storm windows"
AN AUXILIARY SET OF WINDOWS, USUALLY SINGLE GLAZED, INSTALLED ON THE OUTSIDE OF THE HOME'S PRIMARY WINDOWS. IN SOME INSTANCES, THEY CAN BE INSTALLED ON THE INSIDE OF THE PRIMARY WINDOWS.
An extra pane of glass or plastic added to a window to reduce air infiltration and boost the insulation value of a window. If you are considering adding storm windows, you should compare the costs to installing new energy-efficient windows
Multi-layered windows that are attached to the outer casings of regular windows to protect against the elements.