I have a Yamaha 2400 and purchased it with the expectation it would run the AC if needed. It has NOT been able to consistently start either of the 13.5 ACs I've used it for. I'm adding a capacitor to the AC, and hopefully it will remedy the problem, but if money were no issue and I were to do it again, I'd go with two (parallel ability) 2000s. Although the total weight of the two generators is slightly more than the 2400, it allows easier portability (per generator) when the need for extra power isn't needed. Other than the disappointment of it not being able to start my AC, I have been very happy with the Yamaha.