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.
Casement window portable air conditioner installation kit.
The casement window a c employs a redundant support system.
The front is held up by a wood support base that you create with your own materials and place on the window sill.
We recommend using plexiglas.
However any type of material that will keep the hot air out and the cold air in will work.
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You also get a roll of adhesive velcro and large zip ties.
The back outside is held up by the metal brace called a platform assembly that you install on the house siding.