Would two thermostats be possible if a master control switch was in place. For example I leave one end of the house, throw the control switch, and set the thermostat at the other end of the house. (Living room is freezing while bedroom is warm.)
Yes it's possible and very easy with simple thermostats. For example twp non powered thermostats could be controlled in such a way with a 3 way switch. R from the furnace goes to the common terminal and the switched terminals go to the corresponding are terminal on each thermostat.