This ➡️ Motion Sensor Switch is my preferred exhaust fan switch upgrade. You have to make sure of a few things: I prefer to use this on a single-pole light switch circuit, where the light switch only controls the exhaust fan (I don't like the exhaust fan light combos). Lastly, just make sure your decora switch wallplates use the paddle switches, if not you'll have to upgrade your other light switches to the paddle style.