If you have casement windows but would like to use Portable Air Conditioner, you will probably need a Lexan Polycarbonate Plastic Sheet like this to replace the screen so you could get the unit vented. It's better than Acrylic plexiglass because it's easier to work with (cut, drill holes, etc, less likely to break)...
Similar size Polycarbonate Sheets are selling for $109.99 + tax = $124.29 at Home Depot. See link below:
Feel free to ask if you have any questions.
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