I have a GE AGQ06LJG1 (try saying that ten times fast) in-window air conditioner that has served me and my computer-filled room well. It installs like any other air conditioner; a vertical-sliding window and two screws are all that is needed to make this work. And boy, does it work! It'll take your typical 150sq.ft. dorm room from scorching to 70F in about 7 to 10 minutes, and it will keep it there, day and night. Can also be used for larger, apartment-sized spaces. It even comes with a remote control so that you can turn it on from across the room! Similar units, new, cost $150... a measly $80 will get you this one. Instruction manual included. Cash only, please.