Originally Posted By: IzzyJG99
Interestingly.....all of the mobile units despite being high or lower BTU's all said "Can cool up to 500 square feet."

Anything can cool "UP TO" 500 square feet. Including the fan I made by folding up a sheet of paper. It's more likely that my little hand fan will only cool 0.5 square feet, but by definition, that is still "up to" 500 square feet! Marketing ploy from the A/C manufacturers, that's all.