Why do portable A/C machines have vents? Is it just to send dusty/warm air outside or are there harmful vapors and such that it’s expelling?

Question

For background, I’ve been looking to get a portable A/C for my bedroom until I can get a permanent unit installed, which will take time. Unfortunately I don’t have a window, just a sliding glass door. Would it be bad if I got a portable A/C and just pointed the vent tube into the hallway? Is there any hazard beyond dust?

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Answer 1

Get a piece of wood, cut to the width of the AC unit, and as high as the doorway. Stick the AC in the doorway and use the wood to stop the heat from coming back in.