$140 · Portable Air Conditioner with dual hoses

Portable air conditioner with two hoses. Mounted on casters. Five years old. Works great. Hoses attach to the back and then to a plastic window insert. This appliance has kept us cool through five summers. It might actually be a little too powerful for our 650 sq foot apartment: it cools the whole space within minutes. Having the dual hoses for inflow and outflow is very efficient (plus, if you can stand beside your window outside, you can dry your hair on the hot air outflow -- not that anyone would :D )