who ya gonna call?
So your sensor tells you it's cold. Will it call the plumber, HVAC, electrician or just the fuel delivery company? Do you have all of these people familiar with the house/systems so you can call? Do they all have a key? A caretaker should have these skills or contacts and know which one to call and give access. Long winter absence? Drain the pipes; have your guy re-start the heat a few days before your return.
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