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3

Spray foam would be excellent. Until it's time to take the AC out of the window and you're left with a disastrous mess of sticky foam that you can't scrape off to get the window to seal again. Get some pieces of foam rubber and cut them to fill in the gaps between the sashes where they don't seal because the window's open. You could use pipe insulation, pool ...


0

I have an idea. Use a rollup window shade mechanism. Put clear 2 mil to 4 mil plastic sheeting on it. Install thin steel strips around the window casement. Buy 1/2" magnetic strips that surround the entire 1 or 2 screen frame. This way, if you want to open the windows for clear air or natural ventilation, just pull off the magnetic strips, roll up ...


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