My apologies for your confusion.
There is a sensor that the Aladdin uses to monitor the actual bay temperature. It does not control the heat at all. That’s in the first photo and is a probe strapped in my coach to a black plywood upside-down U in the middle front of the bay... I marked it Thermo Sensor on the photo.
The other device is an actual thermostat that turns the heat exchanger on at 40 to 45 degrees to prevent freezing in the bays. It acts similarly to the thermostats in the coach’s living areas, except it isn’t adjustable; it’s temp is permanently set. When the bay temp gets above about 45, the thermostat shuts off the heat exchanger.
Because it is mounted further back in the dark bay, I had to take a second photo, and marked the thermostat “Bay Thermo”. To avoid confusion with the term “Thermo Sensor” I probably shouldn’t have been quite so thrifty with my lettering, and fully spelled out “Bay Thermostat” in yellow on the second photo, rather than simply “Bay Thermo”, so I’m reposting that photo.
Sometimes clicking on the address with the paperclip icon below posted photos will open a more immediately complete image.
Joel