What is this wall-mounted ‘device’?

[GoodBuddy]

Anyone know what the smaller device is in this photo?

This one is mounted to the kitchen wall of my 3791rd between the entry door and the pantry. These is also one in the middle of the large wall in the bedroom. No one explained them to me at delivery. Can’t figure it out.

Thanks in advance!!!

[C&P RV]

Temperature sensor for the AC/Heat system. Probably a Dometic Thermostat that controls the ACs. Multi zone for AC, single zone for heat.

[Derby6]

Originally Posted by C&P RV

Temperature sensor for the AC/Heat system. Probably a Dometic Thermostat that controls the ACs. Multi zone for AC, single zone for heat.

Yep. What he said.

[Cat320]

Agree with the others, it is a "thermistor," a temperature sensor. I have one for each AC unit.

[Ahdmeyer]

i took mine loose and there is a big hole behind it. my son has the same thing on his, removed them and stuffed insulation in the hole to get a better reading from them. seems to be better getting a true temperature.

[Cat320]

Originally Posted by Ahdmeyer

i took mine loose and there is a big hole behind it. my son has the same thing on his, removed them and stuffed insulation in the hole to get a better reading from them. seems to be better getting a true temperature.

I did the same thing regarding insulation. I also place a big standard rubber hose washer between the thermistor and the ceiling....trying to keep it less sensitive to how hot/cold it was outside.