Thread: How do you prevent rust in your gun safe?

One thing that really worked well for me was a mechanical timer and a small wall fan. Air movement at certain times of the day do wonders. Mine was set for the fan to run for a few hours before dawn and a few hours in the evening as it cooled- longer in winter. Adding warmth like a bulb only worked until the bulb is turned off then the temp changes which is the root cause of atmospheric condensation.

If it is a small locker (up to a foot or so wide...) just a small cooling fan will often be enough. And fans dont suck a huge amount of power.