Air conditioner

I have been told that we need the Yamaha 2500w generator to start the A/C. I'm almost ready to buy the Yamaha, still looking for price. Amazon has a good deal @ $1335.

I'm going through the same decision-making process, live in Colorado, and will be doing most camping above 6,000 ft.  I just bought a Honda 2000i and a 2000i companion to run in series when needed while they were still on sale. I'm thinking about returning them and buying the comparable Yamahas that are similarly priced and get just slightly better reviews. I primarily need to be able to start and run the A/C and interior lights together on some trips but am still struggling with which generator(s) best fit our my needs. I'd like something more portable than the Honda 3000, but quiet and easy to refuel when away on a week long trip. I've read most of what I can find in this forum (which has been very informative) but would appreciate any last pearls of wisdom before returning these Hondas. Would a single Yamaha 2400 do the trick as some have suggested? Any thoughts about Yamaha vs Honda for extended boondocking? Is one better than the other if I ever need to use one to power my furnace? These things are expensive and don't want to make a $2,000 mistake - maybe we can share with Podacious...