What brand of humidifier do you use?
We just replaced our old Emerson which still worked but which could no longer be thoroughly cleaned — even with bleach — after the 10 years we had it. We replaced it with a Moist Air Essick. It covers 2900 sq. ft, and that surely does the job for us. I had it about 3 feet from the harp. It drew the harp badly out of tune. So I moved it back where the old one had been in the hallway, closer to a cold air return and about 10 or 12 feet from the harp. You can feel the effects throughout the house though. I can tell when it’s empty because the house gets cold.
I wrote a blog here about humidification last year. You should read that. The short answer to your question though is that any humidifier that blows out “invisible” air(i.e., no visible vapor) is appropriate and should be placed close to the instrument.
I keep a Dampit in my old Troubadour harp, but it is also in the room with the big harp with gets humidity from the humidifier which works just fine. You can tell when it is working or not full by the coldness in the house when it runs out of water…..usually when we are asleep. It is new as mentioned above, and we are getting used to when to fill it. I have no white dust and never have from our evaporative humidifiers.
If it were me, I wouldn’t put a Dampit in my harp. I’ve seen pictures of a harp damaged by one – it ruined the base and the body shell, so I’d be cautious about putting anything damp/wet inside your harp. Plus it will only humidify the body chamber while the rest of the harp receives no benefit. 42% room humidity is acceptable, though on the low end of the target range of 40%-60%, with the outer limits ranging from 30%-70%.
Hope that eases your mind some.
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