I’m actually very pleased with my Rotary Disc Desert Spring
humidifier, it’s in the middle of its third winter and running perfectly fine. So far no problem with the motor but this is probably because I’m running it from my high efficiency furnace’s circuit board, not the transformer that came with the humidifier.
That way the humidifier’s motor runs only with the furnace operating in the heat mode. With its original transformer providing power it was running almost constantly since soon after the furnace turned off the humidity level inside the air duct was dropping, thus activating the humidistat.
I have two small devices measuring humidity level on each floor of my house and it’s a constant 40% on both of them. I did test lowering and raising the setting of the humidistat and humidity changes are noticeable within a few hours so it does work (my house is around 2200 sq feet).
So far the winter in Illinois is mild (40’s) as well and my furnace isn’t working that hard but this still appears to be sufficient to maintain the humidity level setting.