I think if you manage your power use, you can get by with a smaller genny than you might think. As usual, I researched this to death, and came within a keystroke of buying a pair of the Champion 2000w units, and then the WEN 2000w units, to run in parallel, but got cold feet and just ordered a Honda EU2200i. I'm hoping I can run my fridge and a 6,000BTU wall unit. The EU2000i will run a 6,000BTU wall unit with ease, so I'm hoping the extra 200 watts and larger engine in the EU2200i will be up to the task of adding a fridge to the mix. Running watts in a worst case scenario is around 1,300 for both, and I think the only time I might have an issue is if both cycle on at the same time. I was able to calculate the fridge surge watts at 1,400 based on the LRA rating of the compressor. The window AC is the wild card, but I'm thinking maybe 1,000 watts if it's Energy Star rated. The Honda's are conservatively rated I believe, as I've seen them easily power appliances that shut down other genny's with the same wattage rating.

The one thing I learned about the fridge is that the amp draw indicated on the data plate is the max it will draw if all functions were operating simultaneously (defrost circuit, compressor, ice maker, etc.). It's unlikely that the defrost circuit and compressor would run at the same time, so I think running watts under normal conditions is less than 800, perhaps more like 500, so my total running watts is probably going to be 1,000. If the EU2200i can survive a 2,400 watt surge for 1 second, I'll be good to go. I guess worst case is I have to buy the Companion unit and run it in parallel. Realistically, I'd probably just run the fridge during the day, the AC and night, and go through a 4 hour cycle with the fridge. By the way, a 6,000BTU unit will cool 250sq/ft, so you might get the room comfortable with that, otherwise move up to 8,000BTU. I think the power consumption goes up quite a bit above 8,000BTU's.

I cringed at the $900 price, but I wanted something I could put 100% trust in.