I am going considering building a cool room out of an existing stall in my barn. It will be 10x20 ft, I think I have it figured out how to build this pretty cheaply. The only thing I am not sure about is what I should use for a cooling unit. I am located in Kansas, hot hot days and it can be humid in the summer. Room will be for 2-4 fat steers and yearling age heifers. Would a large window ac unit be enough?! Anybody have experience with this?