Yeah, it would seem that vertical is the way to go. However, one of the two windows will get the A/C unit come summertime; my bed is directly under the other window. I will just have to come up with something...
Actually, I have a large bookcase against the wall perpendicular to the A/C window. I've pondered the idea of converting a couple of shelves from book to orchid. At a height above where the A/C would blow out.
Perhaps, perhaps, perhaps...