Have you ever seen an occupancy-sensitive light switch? You see them in public bathrooms sometimes, a special switch that detects when someone is present in a room and powers on the lights, then turns them off when no motion is detected for a while. Not only can those same switches be incorporated into your smart home setup, but they can also be used in tandem with smart fans.
By using a smart fan hooked up to an occupancy sensor, you can have the fan power up the moment you enter a room, and have it stay on for as long as you’re there. Once you leave the room, the fan will turn off on its own. This is a great power-saving trick for rooms that don’t always have people in them, such as living rooms, kitchens, and basements. After all, if nobody’s in there, why waste power on cooling it off?