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

Portable air conditioners breakdown the ambient air into a stream of cool air and a stream of hot air. The hot air must be vented outside or the room will simply not cool. In fact due to the energy required to run the machine, The room will be hotter than if the air conditioning was turned off.