Make sure the air conditioner is close enough to the nearest outlet so you can plug it in without using an extension cord.
Crank window air conditioner adapter.
This would also work if you want to install an air conditioner in a sliding window as well.
Although most portable air conditioners come with a traditional window kit you can absolutely fabricate an insert to fit into the casement window allowing you to vent your portable air conditioner.
We recommend using plexiglas.
You can see how one homeowner did it in the video below.
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Simply screw it to the inside of the screen frame and add a piece of foam t.
However any type of material that will keep the hot air out and the cold air in will work.
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.
First measure the window in order to know what size plexiglas insert.
I came up with an easy way to mount the exhaust vent to my crank casement window.