Yes, Chris, mold can be a continuing problem, but decent air circulation is it's nemesis. When I was putting tree work flyers in mailboxes, I was cruising all the second home areas in the woods, and many many places haven't been visited in some years to many years. It wasn't uncommon to smell the mold from inside the house while standing on the front porch, or just when getting close to it. Kind of creepy! It can't be very unhealthy to stay there, especially when what they call "black mold" has set in, and many people that used to visit their places from the big cities, have given up on coming because airing out the structures became inadequate with less frequent trips to the area. Lots of places like that for sale now and cheap. The mold smell is in everything now, you just about need to get rid of all the goods inside and rip out the whole interior. Imagine having a second home and never visiting, it seems rather excessive to this poor boy. On the other hand, if you hire a service to go in and open the windows on a regular schedule, or have some fans on a timer that move the air daily from outside for a few hours, it minimizes the mold problem to a very large degree. During the rainy season the atmosphere stays damp for a couple months almost continuously, and it is warm temperatures, the perfect environment for mold to grow when poor air circulation. One reason that we get a lot of removal jobs up in the woods, people wanting to let in more sunlight and wind passage.