In the U.S., you can purchase a/c units that you can take from room to room as needed and run the heat exhaust line through a small hole in the wall or through the window with a special kit that can be purchased. They are very efficient, on rollers,not expensive and run on standard voltage energy. Has anyone purchased one of these here and where. I have been looking to no avail. Plaza Lama said they used to carry them years ago, but not now. Any help would be appreciated. They are very convenient.