Ditto on the FreezeAlarm to notify you of a power or heating system failure that leaves the interior temperature falling. Assuming you could get up in timely fashion to respond to get up there and take appropriate action, that might be your only really needed protection. When the weather gets really bitter, you can always call it and read out status of power, interior temperature, etc., for peace of mind.
For real peace of mind, a standby generator, fueled by propane, would take care of extended outages midweek, as well as give you convenience when the power goes out while you are up there.
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