Regarding the cabinet, I just used beads. I pretty much kept an eye on the RH every day, which I don't miss with the active humidification in my current set-up.
If you do go this route rather than the cooler, I would skip the second singles drawer, it just takes up too much of your open space.
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Thanks Dave, Julian, James, Kelly, Peter, Gerry, Dave, Mo, Frank, Týr and Mr. Mark!
