We are installing two Monte Carlo stylist fans 94250, operated off one wall switch. We did not catch initially that they said do not use solid state dimmer control ( motor humming and bad for motor). What is the preferred or correct wall switch, to avoid motor humming?

There are many different brands used for fan. They are not really dimmers like you have with a light but employ 3 steps for the speed. ceiling fan dimmer switch - Google Product Search

Are you installing the lights on the fans? If so, do you have a separate wire for the lights?

Ceiling fan remote controls, remote kits, speed controls, dimmer switches and more - at Ceiling Fans 'N More