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

The heat discarded by an air conditioner must be moved somewhere. Unless you keep your room door closed, cooling off a room by warming up an adjacent hallway will just become a waste of energy.