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My first floor is an open floor plan and humidity was running under 20% in the winter (gasp!). I purchased an evaporative humidifier from Amazon for around $100, I fill it many times a day, but my humidity is now in a more reasonable range. i have gotten in the habit of filling before bed, as the coffee brews in the am and once during the day and that seems to be enough now that I have gotten the humidity up.