Is it possible to mount one of the many inexpensive window air conditioners in a knee wall - with some kind of ducted intake out towards a roof mounted intake?

Hi: Yes it is, but possible don't make it smart. There got to be something you can rustle up better than this cuz I can give you about a gazzillion reasons why you wouldn't wanna do it. Sounds like you are a do it yourselfer and practical sort who don't cotton to the area repair folks much. ( probably with good reason ) A electric packaged unit sounds like your thing with cooling only if that all you want. You don't have to weld in pipes and such cuz it comes like one huge window unit ( Only about a gazillion times more efficient ) and you just pipe her in with good high quality and inexpensive flex duct or metal duct if you prefer and insulate it. If price has scared you off before then go back and look again cuz they are not gonna cost you what those window units will in total. One good place to start your search would be on your computer at a Goodman Warehouse Outlet Site that will sell direct to you. They can send you brochures if you like. You do have to have a license to buy a split system however. But these are much the same as a window unit and come already charged so you don't fool with that . jimiwane