Question

Are there any smart switches suitable for switching an ECM motor on and off? I just had an attic fan installed and I want to be able to shut if off during the winter without crawling into the attic. It often gets above the turn on temp during California winters in the attic and I want to keep the attic heat during the winter as it still gets cold (CA cold, 40s-50s :-)) at night.  

Answer 1

If you don’t want to use a hub, you can use an Insteon remote control relay and put it in a junction box

Answer 2

Is it a plug in or do you have a wall switch? If wall switch make sure you get one rated for ceiling fans. If it's a plug in I know of a great Z-Wave+ controller that can handle up to 1500W.