Here is another reason to get a way over powerred unit.
Right now I live in a tiny place, (much smaller then my last with much higher rent, same way all over, for most of us right?)
Anyway the electrical is very schvach here with far fewer lines and not a single one in the house dedicated just for my use as I had had in the other place.
This means that if I had to run an air conditrioner all the time to stay cool, I would keep blowing circuits out(which I cannot reset since only the landlord has access to the breakers, and he is quite often, not home)especially if I tried to run the air conditioner and the electric oven (no gas in my place for my personal use, like for my stove or oven)at the same time.
So if I could run a far more powerful unit for a lot less time and then have it off while I cooked or heated up some dinner, i could stay cool and still get the use out of every electric and electronic device, I need to use.