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@transcendentape But that fan will shut off by nightfall.

Now, hopefully we agree that moisture will only condense (or at least problematically so) on things that are colder than ambient air. If mold weren't an issue prior to air conditioning becoming commonplace, that reinforces that notion.

So the real challenge is how to most cost-effectively prevent that both in terms of construction costs and ongoing energy costs. And here's the rub as I see it: