Get this. https://www.amazon.com/GoldenRod-inch-Dehumidifier-5D-24-Dehumidifiers/dp/B005FRG03O
Build an enclosure, and then use a gun safe "dehumidifier" in it -- Less than $50, gives you a nice warm environment. Look up "Goldenrod" on Amazon -https://www.amazon.com/GoldenRod-24-inch-Dehumidifier-5D-24/dp/B005FRG03O