Is anyone under the slightest impression that the hotel/resort industry does not do this already?
The systems the hotel chains use are tied to occupancy of the room, when you enter, if the television is on, movement, door opening etc. It is either sneaky, devious, evil, smart, intelligent or good business.
Try this the next time you are in the next hotel of your choosing, bring your digital meat thermometer from home and check the temp. Before I mentioned this did you ever give it a second thought that the temp of the hotel room was not precisely the same temp as the posted temp?