I know that the most of you dont have any problems with humidifying, but you have with dehumidifying. Anyway we here in the cold north kneed humidifiers due to the low humidity in the air. I found one on Blocket (As Amazon) for 400:- (47$). Its a Topcon with its own controller for humidity.
I have some major problems with my old humidifier from Biltema. The ultrasonic plate is not working so i have changed it many times, realy bad quality.
I have no idea how well its working ore if it have better quality then Biltemas.
Here is a diagram over the time its have running in the curingcamber.
Wait an see!