Three questions

There is an adjustable Tstat in the bay with the water valves and the A Hot up high passenger side. Mine does not have any degrees on it and before I stored inside I used several freezing mornings to help figure out it's temps. Left the bay door open and then I could hear the click when I turned it. I agree that it was set higher than necessary. I was able to keep it warm enough with just the electric portion of the A HOT, but we were not living in it here in the GA mountains. During the day when your are not there I would run the inside Tstat way down and then raise it back up when you get home. Will not take long for the diesel portion to bring the temp up.