Indow Windows’ acrylic interior storm window inserts are custom made: A dealer comes to the jobsite with a laser measuring tool and can fit even the most out-of-square windows. A silicon compression tube holds the finished insert in place. Cost is about $20 per square foot plus a measuring fee; the laser system is available for $1,250. Indow Windows, 503.284.2260, indowwindows.com
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