Reddit mentions of TOUCHXEL Electric Dehumidifier Dehumidifiers for Home 1080 Cubic Feet Portable Dehumidifier for Musty Smell Damp Moisture Air in Small Spaces Like Closet Laundry Room Bathroom Computer Room Office RVs

So I did a similar size cooler that's working fairly well. I'm using two controllers similar to the Inkbird, one for temp and one for RH, but DARNIT (pardon the language :-), mine is only either humidifier or dehumidifier mode; I can't run both! Usually that's not a problem, as the meat's usually giving up water and I want to run the dehumidifier, but the thing can overshoot as it's not an autotuning/learning PID. Also, you get a "dueling temp/RH" thing where the fridge cooling kicks on, temp drops, the RH changes, so the humidity sensor triggers, etc. That usually converges to a stable state, but requires some fiddling with your high/low set points on both temp and RH controllers, plus the other params. Sorry for going on, but even with the dual controller Inkbird (which I'm now going to buy - thanks for the info!), this is something you'll be dealing with a bit. Note that your unit has a water tray (I looked up the manual - it's a CWC-3200 right?), "to receive condensation drained from the interior", so when your cooling kicks in it'll be dehumidifying too. AND if it's bringing in outside air, it'll be mixing that RH in. So, good thing you'll be running both 'sides' of RH control.

I can suggest a dehumidifier that I like just fine. Everybody seems to get the odd teardroppy thing; I got this one about a month ago, which is more compact (I think) for $40 and love it. Suddenly now there're a ton like it for $35 or so, and now I see this one for $30. For a humidifier, I got one of these ultrasonic/wick things, and opened it up and am modifying the switch with a dab of solder to be "always on" (it's momentary and goes auto-off when it runs out of water), but again my controller is either/or, so I've not been using it yet. However, apparently the little $10 ultrasonic things like this just set in a reservoir of your choice are a no-brainer.

You'll want a set of S-hooks. I find the smaller the better as you've got limited vertical space. You'll want to think about how you're going to hang them in the cooler - those wine racks are going to be a bit of a PITA as you're limited to the bottom center of each bottle-holding wire and then the crossbars.

Best of luck! Andrew