He Really Does Think We're Heating The Outside!

Meet my 15 year old, Jack. He does well at school, helps out around the house, he's a great kid. But he has a problem that makes me crazy. When he leaves for school on these 2 degree mornings, he sometimes leaves the door wide open. I'll discover this after the furnace has blazed through about 10 gallons of heating oil. I've left notes on the door to remember to close it, threats, bribes, but then again this morning - outside became inside. This has to be a phase, I mean look at him, this is the future!!!