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Hi @David_Leo i go for overkill in my house. First, I have radiant (oil) heat for most of the house with electric baseboards in additions at the front and back of the house. Don’t believe what you hear about radiant heat being the most comfortable – it gets extremely dry and uncomfortable without humidifiers.
I have 2 Aircare Space Saver (Large) dehumidifiers – one downstairs and one upstairs (ahem – situated in my guitar room). They advertise that they’re for houses 2200 sq feet, but I find that having 2 of them in my 1680 sq ft. house work the best for me. I keep them at 50% humidity. The downstairs unit never hits 50% humidity. I’d say it averages 40%, but the upstairs tends to reach 50% more often. Upstairs is where the majority of my instruments are found. The humidifiers have lasted me several years and work great.
I keep all but 3 guitars in their cases with Humidipaks. The 3 I leave out are my electric, my 12 string and the current 6 string I’m playing. They’re humidified by the room humidifier, and I haven’t had any problems.