http://www.iaqsource.com/product.php?p=jackson-systems_ls-hcpb&product=174360&category=1621 GF's son likes to crank thermostat in his room, up to highest setting and leave it there all winter. So now i have the ideal thermostat for his room. its preset( resistor?) in W wire, so he can't change it, plus it will show what ever temp he sets it to, @ 80,85, 90 on screen, but won't go above 73* by room temp.
As the ole saying goes" theres more than one way to skin a fat cat." its ordered. shouldn't be anything that will effect coal usage, we keep main house T-stat set at 72* in winter, and his rooms up stairs.