One of my favorites is the auto on bath vent fan - kids and I either forget to turn them on or forget to turn off- big bad either way and wiring the fan to the lite switch is a real energy waste.
But there are moisture sensing replacements for the wall on/off switch with adj. on/off levels and run times - they just come on when you get shower mist & off when dry - about $40
And for the wifi fans there's the $9 Sonoff switches for either hardwire, plugs (up to 16 amp) or lite sockets. There's one with a temp. input too
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