We have a very small lanai just like yours. When we had it glassed in, I asked the salesman from Custom Windows that exact same question. He said that we should close and lock the slider to the lanai and leave the lanai windows closed and locked. He said we would not get any mold. We haven't been gone since we enclosed the lanai, so I can't tell you whether he was correct. Maybe you could call Custom Windows and see what they say: (352) 787-9797.
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