Actually, didn't Doc & Sprocket move to the desert in Arizona? Not all of Arizona is a desert, though.
They didn't really say where specifically they moved to. Doc just told Gobo that they were moving to a place called the desert, which sort of implies Arizona, but keeps things rather non-geographcial. He didn't say Arizona specifically, but that's sort of the impression that the viewers get about the new residence. When I hear desert, then I do immediately think of Arizona. But, it could also be New Mexico, or even parts of California.
I remember the week I spent in Tucson, and by the time we flew out, I was having trouble breathing and my asthma is rather mild. Arizona, on the whole, is known for having issues of asthma as a health factor. One of my friends lives there, and is an Asthma sufferer. She always makes comments about her lungs feeling like cotton.
Speaking for myself, I
always breathe easier when I'm around the moist sea air as opposed to being in dry climates like Arizona. Of course, in the last episode, Doc did say something about the mountains in the distance, so maybe Ned was there so that he could get to them. Hard call, but still that whole bit about the desert and Ned's asthma is simply quite puzzling to me.