Originally Posted by adonh
I have a Carrier 15,000 BTU AC that I installed on my 1976 A/S last year. Works and cools very well.
My only complaint is the fan speed, high and higher and not very quite.
A lower quieter fan speed would be nice.
Is there any way to retrofit a lower fan speed switch?
You probably could, but you probably shouldn't!
Every RV roof A/C is designed to operate at a minimun CFM (cubic feet per minute) of cold air discharge. If this requirement isn't met, the result is usually evaporator ice-up. This happens from blocked ducts, intake air mixing with cool discharge air, and a number of other variables .
I'm certain that Carrier (and all the others) take this effect into account when they design their units.