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Adding Clear Insulation to Decorative Glass Single Pane Windows

Barshfield's picture

I've got two door-sized exterior panels of single pane decorative glass (clear, but frosted with a deeply sculpted pattern from the 1960s). When the sun hits it, it is like a magnifying glass (sort of) and bakes us inside.  I am thinking of adding either plexiglass panels or shrink film on yhe inside to help insulate.  What do you all recommend?  Thanks, Mark