What are these switches?

[Ryan Wright]

Under my couch and dinette I have a vent and next to it, switches:
"on/off" and "hi/lo". Are these for heaters? They don't appear to do
anything.

I've found the three electric heaters, they are long and skinny with a
dial on them to select temperature. They're OK, I suppose. One has a
bad blower. They're a bit smelly - probably settled dust and non-use
combining together for that perfect heater aroma. :-)

-Ryan