Us older folks refer to that as the Belt and Suspenders route.
Oh, and if you have a smart home setup, I have a unit in the safe that alerts me when it detects motion , high temp and high humidity via my Smart Things controller. (yes, I am really a Geek...)
Keith B wrote: ↑Thu Feb 28, 2019 1:17 pm I use a dehumidifier that has a color-change indication when the moisture levels go up. When it starts changing from blue to pink I pull it out, plug it in for 24 hours or so, and then put it back in the safe. Usually lasts a couple of months between renewal sessions. If you live in the SE Texas swamp lands, your results may vary.