I can't help you there. At my bro's office, someone often leaves the central heat/air on overnight when nobody is there...And of course, it's always "somebody else" that did so --
Same concept . . . does me no good, as I'm usually coming in around 6 a.m (5 am. on Wednesdays) and the night crew I hardly ever see (add to the fact that most people at my store work flexible shifts) so it just adds to the frustration.
And I can tell it was used after I leave b/c I've gotten into the habit of making sure it's turned off when I leave around 3 in the afternoons . . . so you know somebody went back there and made a pot later in the day.
One of these days I'm going to show up to see fire trucks in the parking lot b/c somebody did a Randall and left the damn thing on all night long again . . .