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

You can’t create coldnes. An AC has to move heat away from your room through that vent. There are no dangerous vapors involved, but if you don’t seal off the path for the hot air to flow back to your room you are buying a very expensive and energy consuming fan.