When I built my home in 1994,I could only afford the single pane ones. But they are only 3'X 4'. Two years ago I bought a large roll of small bubble wrap. Cut to fit inside windows,colored a few in living room and kitchen with Rite dye. Makes a great storm window. Roll them up and store for the summer. Saves us about $30-40.00 a month on heating and gives a cool look. Much easier than the film thing and are re-usable. We don't AC but use a 36" attic fan W/timer. Home is only 750 Sq feet.
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