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I was talking to a relative that has a cabin in northern Mi. and leaves his heat on all winter. They have a electronic device that calls their cell phone if the temp drops below 45 degrees or if the power goes out for more than an hour. Then they can call someone to go have a look see. They have two thermostats on the furnace and if they call their number at the cabin and give it a pin # it switches thermostats and turns the heat up so when they get there it's warm inside allready. All pretty neat stuff.
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