I also have the appliance in my bedroom, which is 25 square metres in size. As long as you don't hang up laundry to dry, this is more than sufficient. I change the container once every 1-2 weeks maximum (depending on your basic humidity in the room, of course). The volume is also no problem, but it always depends on how you feel. I have programmed the device so that it switches off at 3 am and starts again at 8 am. If the TV is on, you can't hear anything from the appliance (in night mode)