I stumbled upon this fabric window seal kit on Amazon, and it was cheap enough that I decided to give it a try. Fabric Window Seal for Portable Air Conditioners Plus, a strong gust of wind would knock a foam insert right out! Plywood would require multiple screws to be drilled directly into the window frame. We only have one window in this room, so blocking off all the sunlight isn't really an option. This is a fairly cheap and easy solution, but also has its own drawbacks. Video can't be loaded because JavaScript is disabled: Portable air conditioner with crank / casement windows : DIY exhaust mount () You can see how one homeowner did it in the video below. This would also work if you want to install an air conditioner in a sliding window as well. This method uses the window vent insert that comes with the portable air conditioner, coupled with a piece of rigid foam or plywood to block the rest of the window. I also had a hard time finding a screen frame that would fit in our windows, and I didn't want to drill permanent holes in our window frame either. Check out my tips and tricks for cutting Plexiglass if you decide to go this route. The downsides to this method are that big acrylic sheets are expensive, and it's difficult to cut a perfect hole for the exhaust vent without cracking. But with the heat wave imminent, I needed something quick and easy! This is a great long-term solution, and one that I will probably do at some point once I figure out all the parts. Video can't be loaded because JavaScript is disabled: How to install a portable A/C unit into a casement window ()

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