After a few weeks of use, a single idea trote my mind: why I have not bought it sooner!
I use it in a room of 10m square area, which was regularly between 60 and 80% relative humidity range.
Thanks to this device, I do more than 50%, by cons for me, it is impossible to sleep with, because of the noise.
In short, I recommend it widely, in addition to a small fee compared to other devices.