I think it mostly comes down to whether you prefer red or blue. I bought a Yamaha 2400is a few years back because I read multiple posts indicating it would run a 13.5 A/C. My experience, however, is that it is not capable of reliably doing so. Although it works great and meets our needs otherwise, if I had to do it again, I'd buy a 2000 model (either red or blue) and purchase a second if A/C is a necessity. Because we live in Arizona, our rule is mostly that if it is hot enough to need A/C, we either go to a campground with hookups or to a higher elevation. The 2400 weighs around 70 lbs, so although it is not a HUGE issue to move around, 40 lbs is preferred. Unless you need the extra 400w the Yamaha provides, I'd go with the lighter gen.
