Im wondering if it makes sense to use a potentiometer dial to control each of the two cabin heater fans individually. Any issues with doing this? It seems like it would be nice to have more finite control of the air passing over the exchanger. Ive had a heater that worked like this in an RV (not the plane) and with only low or high options you got to choose between being run out of the vehicle (too hot) or putting up with the fan noise to little or no effect.