do you really need a 7' or greater ceiling height? ours is 6'-6" and we don't notice the dif.-- this does keep the weight down a bit and lowers the c.g.-- also don't know how much more efficent that makes the heat/ac but it can't hurt-- with all that said it's a T2000 with 22.5 s and measures 12' 2 1/2" at the top of the satellite cover{it's auto tracking and is maybe 2" higher than the ac units}- oh-- with the price of fuel where it is, i am glad i'm as aero as possible-- {not that it's any great help} -- hope this helps--- mase