Thanks everyone! My switch looks like the one in the pic but I will have to look closer to see if "air" or "heat" is imprinted on the toggle itself. I have seen replacements that have a rotary dial, these must be aftermarket. I think I will try to use my existing switch after switching to a 12V motor. The current should be approximately halved and therefore the power dissipation from that ceramic/wire-wound resistor should be one fourth of original (power = current squared times resistance)