We have used this humidifer for quite a few years in my daughters room. The great thing about this humidifer is that it has multiple settings! I can set it on low or high and leave it on all night or you can choose the humidity level that you'd like and it automatically adjusts! We love it not only because it has worked so well with adding moisture to the air, but also serves as a sound machine for our little girl. Running constantly the water only needs replacing every few days, but the filter does need replacing often. They are hard to find and super expensive. Also, sometimes the main base part gets knocked off of the base and causes water to spill. Otherwise, it is a great addition to our daughter's room.