I got this because I've got a spare room that doesn't have Central air. It's about 500 ft with 11 ft ceilings and this works fantastic. It quickly cools the entire room and is seriously cold. It was easy to install, I did it by myself and doesn't seem to use much energy. Dual vents help because you can direct them in opposite directions to cool the room down quicker. I live on the southern coast of the US and it reaches 110 or more here during the summer.