mystery switch by control panel

[Mtgndrsn]

on our 2013 326SRX toy hauler, to the left and down from the control panel, there is a thermostat and under that is a black switch. Can anyone tell me what it does?

[BrooksFam]

Sorry I cant help, but a picture may help someone else help you.

[Mtgndrsn]

I can't figure out how to get a picture in here. I am starting to wonder if it has to do with the artic package or whatever that is called