We have 2 Honda 2000 units (parrelled) with the 30 amp plug. We do run the AC when we are inside and it has more than enough power to run our 15k unit. When we are not at the camper I usually turn all generators off and make sure my fridge is on Propane to keep everything cool. No need for the hot water heater to be on or the water pump - just the fridge. If we have to lay down for an afternoon nap ( were old :))we turn on the generators, cool it down and relax.
We have about $1500 invested in both units along with the added 30 amp device that attaches to the generator. I just built my own extended run tanks for both generators that will hold a total of an added 12 gallons. :B