In "high" function, noise is equivalent to that of a large fan, so not bearable at night. By cons, my daughter tolerate in "low" mode at night, because it is already accustomed to the sound of a heat pump. But it is true that it remains a sound that could not be supported by adults who need some noise to sleep.
The power of the humidity extraction is such that the container is full by 12 am, hence the usefulness of the ability to connect seamlessly with the evacuation from the outside (it was one of the criteria of my choice) .
To see if the resistance with the use will be permanently at RDV.