I was in meetings all day and checked in at about 10PM. The room was clean but very warm, 75 to 80 degrees. I turned on the air conditioner to lower the temp to 70, and about 5 minutes in, the AC started to make a horrible noise that lasted for about 5 minutes. I waited a bit and this process continued about every 20 minutes, 15 minute of quiet and then 5 minutes of horrible rattling, I called the desk and was told they were sorry but the maintenance staff had gone home and that they were full. I had to sleep in a room that was about 80 degrees all night long, and all the hotel staff had to say was "We are sorry you didn't enjoy your stay."