Unable to cool 223 sq ft room. No way it could cool a 400 sq ft room. The outlet air with max fan is detectable only about a foot or two away from unit. I am currently in the process of sorting out a return with their Product Support. Whynter is not very easy to work as it is time consuming - although I don't know the final outcome. I suspect that it simply is unable to cool any room that does not have excellent insulation. The room I am dealing with is not - but was cooled just fine in the hottest parts of August with a smaller capacity window AC. I thought this would be easier to deal with and it has not turned out that way.