We also have automatic thermostats, to turn things up and down depending on if we are there/time of day. But we never turn the heat completely off when we're not there -- partly bc we have pets and partly bc it takes so long to warm back up. (we own a largish house that is about 110 years old, but has been insulated; the 3rd storey is a master suite but obviously we're only really up there at night.)