How noisy is this thing in bedrooms?

I would not consider it the quietest option, but it certainly has enough output to keep everything from your bedroom to your living room cool.

Does it have to have access to outside air and a drain hose?

The hot air requires to exhaust to outside by attached hose. There is no drain required, it's automatic evaporated.

Yes. The outlet needs three holes (with grounded).

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Global Air 10,000 BTU Portable Air Conditioner Cooling /Fan with Remote Control

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