Are there any plug-in devices out there that can control the speed of a desk fan? Essentially a plug-in dimmer module like the Lutron Caseta one, but that can handle a motor load.
I’m not aware of any The control speed. There are ones that can handle the motor drive just for on/off, but of course that’s a separate use Case.
If you find one that has a handheld remote, there might be some options with that.
See the following existing discussion ( The topic title is a clickable link)
We haven’t heard of any device like that unfortunately but will dig some more and post here if we find anything that’s suitable for your application.