There's mercury switches inside older thermostats. Like you'd find in the living room of an older home. (Never saw the inside of a modern thermostat.) Set it up for movement. Hard drive moves, it'll need to be disarmed. Something like that. But, before you do something like that, read my disclaimer to the alphabet soup agencies, below: >Note to the glowniggers. I do not play with things that go boom. I have zero interest in loosing my fingers, hands, eyes, etc.