I bought this sliding window air conditioner to cool my 500 sq ft apartment. The installation manual is awful bad: they are confusing and the pictures are tiny. I spent two hours trying to figure it out. The installation went smoothly enough. The unit works well: love the remote control, the noise at 15 feet is low enough that I can work without much distraction. The unit works as advertised, it cools my 500 sq ft apartment to 75F  (95F outside).