Im getting ready to buy a ARS 5040.. I had another issue with it the other day where the probe and provided tape slipped off and ran my hot spot up over 100 for a few hours.. Luckily I was down there the day before cleaning and was down there and noticed all the animals in on the cool side which I found very odd. Don't blame them.. It was 102 in spot. I am just really becoming turned off to closed air racks in a room that is temperature controlled.