I kept mine on, set to 85, also. It gets hot here, and the AC keeps the humidity down in the trailer. I was mowing grass in the back yard, and when I shut off the mower, I heard an awful racket coming from the direction of the trailer. Ran around and got into it as fast as I could. It was the AC, and it sounded like it was trying to shake itself loose from the top of the trailer. I shut it down as fast as I could. I have no idea what it was, but I imagine the folks at the dealer will tell me.