Quote Originally Posted by ctrlfreq View Post
First, if the thermostat is set to heat to 92 degrees, you will never see 95 degrees regardless of whether there is a rheostat inline or not.
I think the idea for the rheostat being there was in case the thermostat shorted.

I was just thinking about it from a really basic standpoint, and will digress to those with more knowledge of the inner workings of thermostats