I live in AZ...extremely dry in winter, dry in summer (when the air conditioning takes all moisture out of the air). I've finally found a humidifier that works! Easily keeps our large bedroom humidity up to 50%, even with the door open. And the first setting is sooooo quiet. No problems sleeping. I refill about every other day. If you agonized over choosing a new humidifier like I did, buy this unit. I just saved you a great deal of time!