Is it smart to lay plastic under a pier and beam cottage and should I close it in?

b port
Updated: Oct. 31, 2021

Some mold smells exist in our 80 old cottage. If I use the cottage 3 seasons only is it better to lay plastic down and not close in the crawl space in? On the other hand if I used it some times in the winter should I close the crawl space in the best I can and use an exhaust fan with a humidstat control to create some negative pressure?  

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