We have a system that will dial a number with an alert if the temperature goes above a set temperature. It runs off of 12 V in case of a power failure. If the temp goes above (or below) a set limit it connects to your cell phone by Bluetooth and dials your other cell phone with the message. We each have a cell phone so I leave mine and we bring the other one. It is in the MH at the storage lot so I don't have any information but all the parts are available on line.
David, Sherry and our three fur kids, Nicholas, Finnegan and Bentley
2013 Coachmen Encounter 36BH