Winter
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The coin cell problem
A sensor that has run out of battery does not tell you it has run out of battery. Why coin cells fail in the cold, why lithium matters, and why last-seen is a reading in its own right.
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Freeze protection for an RV you are not standing in
A burst line is a five figure repair that announces itself hours after the temperature crossed the line. Monitoring does not stop the freeze. It buys you the hours.
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Checking on a stored camper without driving there
Off season, the rig sits somewhere you are not. The two questions worth answering remotely are whether it is getting too cold and whether something is still running.
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Three reasons the furnace quits, and only one needs a technician
Propane, battery or a fault: the interior temperature says the heat stopped and cannot say which. The readings that can are ones you probably already have, and they decide whether your morning is a fill, a plug-in or a phone call.
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The split shows up at ten in the morning
Ice splits a fitting and then holds its own leak shut, so the expensive hour is the middle of the following morning. Which makes last night’s bay chart a prediction rather than a record.
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The pads are on a switch nobody checks
Holding tanks freeze slower than water lines and cost more when they go. The reading that matters is not the tank temperature – it is the difference between the tank and the bay around it.
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Same water, one night or one winter
The water on the window this morning and the mold behind the mattress in February are the same water, arriving at different speeds. One sensor at the glass predicts tonight; a cheap multipack in the cold corners predicts the winter.