Now I could be lying through my teeth, but I thought I had seen a 'tower' that was both air chiller and heater. Can't remember if I read an advertisement or saw it on TV. Since I really don't watch TV all the much it was probably the first. I used to have a unit in my longarm room that was a window unit that was both hear and air con so I know its possible. This wasn't true air con that I was looking at as it didn't dehumidify (no 'running' water) so you don't need a window.