I bought a mobile AC unit that renders my apartment survivable during summers. Prior to it, I'd have all the windows open and it would still reach 35-40 degrees C when the sun was at it's highest point, now I'll keep it at around 21 degrees and love life.
Oh yeah they all need that, sorry for the slow response. They generate more heat than cold, so a tube to vent out the hot gasses is required. I got myself a Electrolux confort 6000. You can buy a mesh window frame type thing to insulate around the tube poking out without letting the heat back in.