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the a/c unit does require a small window (or a large one largely blocked off) which can take some work if your windows are not the right size, but that's true of any unit like these.
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from
www.amazon.com
this product is advertised as being portable, but it must be attached to a window vent to work.
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from
www.amazon.com
note this needs to vent out of a window.
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Positives:
Good Affordability, Quiet Operation, Cooling Capacity: 12000 BTU/hr, AC Type: Portable