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It works like a fridge.
Regardless of the AC you buy you will need to vent the hot air somewhere. If you don't vent it outside then you might as well not be running the AC.
I got a 10,000 BTU portable unit with Dryer like hoses; one to intake air from the outside and one to spit it back out. Its one big unit. I doubt you'll hear the outside with that baby humming away.
If you suck air from the room you create a vacuum in the room and will draw in warmer air from the house. If you suck air from the outside and force it into the room the room becomes pressurized and you'll be forcing the cold air out.
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