I keep all our windows and vents closed while in storage. If in storage more than a week, I usually put in some Damp Rid moisture collectors and fully open the refrigerator doors and bathroom door. I use the larger ones that have a drop in tablet like these: https://www.amazon.com/DAMPRID-Conta...s%2C222&sr=8-6
I put one in the kitchen sink, one in the bathroom sink and one on the bedroom dresser. They seem to last about 2-3 weeks in NE Florida near the coast where humidity is high. Depending upon where you are located, they may last even longer.