AC wall switch

[Snowtek]

I have a 2010 Landmark Augusta that has 3 AC type wall switches mounted at the control panel. One is fir the water heater and one is for the front AC outlet but the 3rd on unmarked and I don't know what is for. When I switch it on a red light comes on at the switch but I can't find what it controls. Any ideas?

 

[Bob&Patty]

Tank heaters??

 

[wdk450]

My 3rd AC wall switch in my control panel is for the overhead room fan/light, but does not have the red light indicator. My only red light indicator is on the water heater AC wall-type switch