Woke up chilly and aching way too early. Came out and looked at T-stat and it said 78 was the room temp. Got online and after a bit made coffee. Went back to the bathroom and thought dang chilly back here. Check T-stat and it now reads 80. What the hell? Temp outside is 3F and bedrooms are cold as hell by now. Finally figured out that the oven has been on all night at 400 degrees and keeping the kitchen,living and dining rooms nice and toasty while the rest of the house chilled down!