My AC went out right when it started to get really hot.  I had to get something to cool off my living room while I shopped for the best option for my AC in the house.  It was really easy to set up and get the exhaust set up in the window.  I cooled off really well and was really helpful in a time of need.  We used it from when it was around 85 high to 100 and was really good to have