Also, since we're speaking of heat.....just this afternoon the heat here at work wouldn't go off! Before I went to lunch I thought it was getting kind of warm, by the time I got back I knew it was way too warm so I went to look, sure enough, it was 78 degrees in here! Obviously something isn't working right so I turn the heat off totally at the thermostat. Furnace keeps running and it gets up to 80 degrees! By then I can't stand it anymore so I turned the switch on the furnace itself off. Whew, it's finally down to 74. I've now changed the batteries in the thermostat and by golly I think I fixed it! At least I can breath now - whew!