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

Air conditioners don’t ‘make cold’. The way they work is to take heat from one place and put it in another while generating a little bit more heat at the same time.

Indoor A/C machines need a place to put the excess heat. So they take indoor air, cool down some of it, out the extra heat into the rest of it, blow the cool air back into the room, and blow the hot air out of the exhaust vent.