Always buy the biggest BTU you can get regardless of the room size. A bigger BTU will be more quiet on it's highest fan speed setting than a smaller BTU will be on it's lowest fan setting.
^ Not sure that I agree with that, have put in a couple very large units that aren't. However, on their lowest fan setting they do move as much air as a smaller unit on its highest setting and are then more quiet doing so.
No. Buy the right size for the room, especially if you live in a humid area. An ac that is too big for the room won't remove enough humidity amd will leave the room cold and clammy.
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Thank you!