I bought something similar for a top floor apartment in Sydney. The unit was fully self contained with a hot air duct that you hung out a door or window. It worked pretty well, and the advantage was that we could wheel it into the bedroom on hot nights (top floor, north west corner is not the coolest part of the building!)
This is a newer (and much fancier) version of the one we had
http://www.delonghi.com.au/products/...Model=PACW160A