Unless you live in a very dry climate, humidification is rarely needed during Spring, Summer and Fall. When it is mostly needed is in Winter when the air outside is cold, and can't hold moisture, then it is heated inside the house, and the humidity drops into the low 30's and below. After all, we are talking about Relative Humidity (that is relative to the temperature). The RH of 30 degree air outside may be 70%, but then when heated, the RH becomes 30% pretty quickly.
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