This unit has been great and cools very quickly.   This air  conditioner is quiet and easy to use.   It sat tight into place in the window and cooled a large room down very quickly.   It held its temperature well and did not seem to run to much no too little.   I enjoy that more is being put into energy efficiency and to help save money when we have to use more to keep homes warm or in this case cooler.  Great unit and good for residential rooms of many sizes.