We purchased this to replace a in window air conditioner that we will use next year.  I gave it 4 because we only ran it for 4 hours in November.  November in Maine is cold anyway so I can't determine if it cools the same as a window air conditioner.  I like that it rolls easy and installs in the window easy.  And the biggest benefit is that if we are not going to be home for a while it is easy to uninstall from the windows to avoid and burglary issues.  If I have the opportunity to update the review I will do so next July, after we have used it for a month or so.