the problem is opposite. Let say in the room is 29 degrees and I want to have 23 inside the tank. If I want to get lower RH, I need to exchange some of the air with warmer outside air. So the cooling will need to work more. It will be a matter of experiments to see how much air will need to be exchanged and what temperatures can be achieved.
But it is sure that if I want to get down to 17 degrees in the night of such warm day, I won't be able to exchange any air, and the RH will have to stay high.
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