Well, then I have no idea what the actual relative humidity is. All I know is that the humidifier in my bedroom tells me when I leave it off during the day that the room RH is in the 20s to low 30s. I do have forced air heat in the house. And it is still wintertime here more or less. Either the humidifier's sensor is, for lack of a better term, dorked up, or I just have a very high tolerance for dry houses.