My husband built a little addition to our house last winter and forgot to add the duct work so that our central air could cool the area. I purchased this unit for a temporary solution and it works so well that I’m thinking we will probably just continue to use it and not bother with the duct work. In fact we have to turn it off sometimes because it cools the room so well.  We like to sleep with the window cracked during Maryland winter time -if that gives you any indication of how tolerant we are to being cool.