Two years ago we moved into a timber frame house with a 14ft high great-room ceiling. For the next two winters we used our old humidifiers which really struggled to take care of the great-room, dining room ad kitchen - all in an open floor plan. So I began the search for a better humidifier last Spring. Finally this fall I found the Vornado and since I was out of time to order something, I went ahead and bought one thinking if I liked it I would buy a second. It was a great decision! This humidifier is so quiet that we run it on high all the time and it services a 20x30 great-room, 20x14 dining room, 20x15 kitchen, 20x18 bedroom and 15x18 office. In two days it raised the humidity from 52% to 62%. Great product (so good I don't think I need to get a second!)