This is because runs on 2 "D" batteries, consider the AC Ally to the beach, little league baseball games or even about any where else you sweat. Purchase is 12000 BTU's end up being cool an area up to 500 feet square. Portable air conditioners have either 1 hose or dual hose system. If for example the air con will be installed the actual planet kitchen, about 4000 BTUs must be added.