My house has casement windows, with dual pane glass. The windows have
screens on the inside. The screen frame units can easily be removed by hand
in about 5 seconds. Suppose I were to have sheets of plex-glass cut to the
same size as the entire screen frame, and, for the heating season, removed
the screen frame and simply slide in the plexi-sheets where the screen
frames normally go. Would having the sheet of plex-glass there result in
significant savings on winter energy costs, or would it not be worth the
trouble? Would doing this harm the windows in any way due to heat buildup
from sunlight, etc.?

Thanks,

JY

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