As Alchemy pointed out (quite accurately), you'd have to have a significantly colder plate, in order to recuperate the humidity out of the air. the [ambient -3] just won't cut it.
I'm afraid that it won't work without some external power to make a cold/condensating plate.
It all goes back to a dehumidifier; look at the principle.
...and of course, they are more efficient than pelts.
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