I put the bathroom heater on a timer years ago. Best thing I ever did. I would like to put the exhaust fan on a humidistat so it automatically comes on during a shower and shuts off after it drys out in there.
i did the same thing on my wife's closet light. She kept leaving it on, all day long. So i put it on a timer and put an LED bulb in it and it dropped my monthly bill by 41 bucks and change.