Thanks. I'll check out Philips. I wonder if third-party pads exist.

I prefer dumb, but I don't mind if it's smart. Especially if I can integrate the smarts into my Home Assistant rig.

I built a humidifier once. I just used the Instant Pot that was already on the countertop. I filled it with water, set it to "Keep warm", and it slowly evaporated the water and left minerals behind.

This worked fine (it was safe, if inefficient).

But monitoring the consumption of water and the improvement in humidity showed that to actually raise the humidity to a comfortable point would and do so throughout the house would use a lot of water.

And I want to do more with my time than fill humidifiers back up. :)