WNYBob- Ditto here... cracking two vents and a small side window works great regardless of weather conditions. I don't add dehumidifier or desiccant, not that either would hurt provided they were serviced regularly.
Conversely, I attempted the 'sealed' technique (shut roof vents & windows, then covered with tarp) with the prior rig... nothing but mildew and mold come spring. Never again... conclusion, gotta let them breathe!
I will say, my Pa-in-Law does a bit of a combination of dehumidifier, desiccant, and cracking a vent; he's never had a problem despite also being in the PNW
BBF
