My parents had a unit like that, a GE, I believe. The indoor component was only about 6" tell and the outer hung from the same height down to a foot or so below the window. It was extremely unwieldy and definitely required 2 guys to install even though it wasn't very heavy.
IIRC it was 8,000 btu and seemed to do an excellent job dehumidifying. It wasn;t that quiet, though.