Originally Posted by stubecullerstan
we can only find them in 15 amp. All of the circuits in the house are 15 amp except for one that is 20 amp.
Practically, I doubt you will notice any shortening of the switch operating lifetime due to occasionally switching 20A with a 15A switch, unless you are switching a large motor.
A ceiling fan is a 'motor load' but they may only pull 1 or 2 amps.