TempStick
We use the Tempstick and a wifi hotspot. Tempstick has a plug in model now, and you program alerts when temp reaches your alarm level. It sends out texts with the alarm. They are working on an alarm for power failure as well as temperature.
These sevices only work if both the Rv and your phone have signal--data for the RV, texts for the phone. And you need to set the alarm temp suuch that you can get gack to the RV to rescue Tink. I bought directly from the company in Utah, had unit here on the East coast in 2 days. They gave a better price when I spoke with them than I found on Amazon.
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