The hot side temps will change dramatically as the cool side temps change. The best guess I have is the room temp is about 75-77 or so? and the top is cooling faster than it is heating that would generate the middle to be the warmest and the top is loosing heat and the bottom isn't heating enough. I suspect that the best way to deal with the ambient temp is just to run the room heater on a T-stat and be done with it. It will go on and off on its own.
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