There is a new air conditioning unit out - called a "mini-split" I believe. They are very small (about 1.5 feet long and only about 6 inches high). A friend had one installed in his attic office recently and it is awesome. It is installed on the wall, and has a very small vent tube that runs outside. Not sure of the exact price, but he said it was under $1,200. We are considering two of them for our cottage in Michigan.....