[asdff]

You don't stick a portable AC unit in the window. The unit sits inside. You just run vent hoses out the window for the compressor.

Opening sideways also shouldn't matter for a casement AC unit.

[zarzavat]

Portable ACs are borderline scams because the hot side is inside the room it's trying to cool, among other reasons[0].

[0] obligatory TC rant: https://youtu.be/_-mBeYC2KGc