It is really very effective, I vacuum every day since its commissioning and the humidity in the apartment has fallen sharply (from 70% to 50-55%), the dryer now in a day so that it is not in the same room! Very practical with its humidity sensor and digital controls. However, it is quite noisy, but I expected that. Setting 2 fan speeds are not change much, there is a constant noise from the engine which may be compared to that of a refrigerator, but it's still bearable.