No neutral fan control?

You probably already know this, but first things first: A dimmer switch intended for lights should never be used to control a variable speed motor. The physics are different. You can burn out the switch or the motor, and it’s a definite safety hazard. So you need a switch which is designed specifically to control variable speed motors.

Lutron has not put out anything for variable speed fan control in the Caseta line, which is the one that has an official SmartThings integration. So that’s not an option.

Second, before trying to sort through all of the information in the forums, it’s usually good idea to start with the FAQ section. :sunglasses: In this case, there is a current FAQ on fan options. And the fourth option in that FAQ is for situations where you don’t have a neutral. It’s utilizing a Lutron Maestro fan controller device, And integrated through a Logitech Harmony Hub universal remote.

It’s not ideal for several reasons. For one thing, it’s an expensive option because of the number of devices you have to use. And, since it’s based on an IR remote to the wall switch, it’s one way status only. That is, you can definitely create a SmartThings automation that will control the fan, including voice control options, time of day, triggers from other sensors, etc. But if someone does use the handheld remote or the wall switch to turn on the fan, smartthings will not be aware of it, so the status in the SmartThings app may be incorrect.

So it’s an option that will work for some people, but not others. Here’s the FAQ (this is a clickable link)

In addition, as @marktheknife already noted, many people find that they can use the Hampton Bay zigbee fan controller ( also listed in the fan FAQ) even if they don’t have neutrals at the wall switch, Because the wall controller for that particular device is battery-operated. So as long as you’re OK with having a battery operated device on the wall, it can be a much better option than the Lutron Maestro/harmony choice. It’s less complicated to set up, it’s less expensive, and you do get two way status so the SmartThings app does not get out of sync with the fan. So I would definitely look carefully at that one as well.