While I like the lighter concept of the 2000's my wife isnt going to pull a cord to try to start it when Im not around so I went with the eu3000i. Yes its heavier but I put it in place and it runs longer than the standard tanks in the 2000's. As far as ac is concerned you dont need 4000 watts to run it, just need the power to kick the compressor on then the power demand drops.I have installed a "hard start kit" in my ac which are larger capacitors. They charge up then kick over the ac nicely.