You have a sh*tload of thick spanish cedar in there as a humidity buffer, so your need for beads is much less than in a coolerdor.
Back to the original poster: one thing to watch with active humidification is power outages. My Hydra's do not turn back on after a power outage - and when I turn them on manually, the setpoint has to be reset from the default 70%.
If the coolerdor isn't going to be accessed very often, then you don't really need an active system - the fan and beads will do the job nicely. If you want to spend more money, consider a wireless or remote hygrometer like an Oregon Scientific so you can monitor remotely.
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