I have my safe in an insulated back room of my garage. I have a Golden Rod to raise the temperature a bit above ambient. In addition I use an Arm and Hammer Moisture remover and change it out when it fills. The combo seems to work well.
I have a 64 gun safe which, when purchased, I put a qt. container of Desiccant.
The can's contents have never changed color or appeared damp.
I recently bought a hygrometer, & it states the humidity is ~70% which I believe is
higher than desired.
Anybody have any experience or recommendations?