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

AC works by creating cold air AND hot air. Normally, you’d point the cold air inside, and hot air somewhere it won’t bother you. If you put it somewhere where they can mix, all you’re doing is heating the room very expensively.