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

An A.C. unit simply pumps heat from one place to another and the best way to do that is to pump the heat outside, pumping it to another part of your home is just wasting the energy as that hot air will find it’s way back in eventually.