I have been considering this for quite some time now. I have significant ammo stored and at the prices things are now it adds up to a small fortune. Plus its tough to replace things with all the shortages.
My safe is located in the basement and I have been noticing the humidity lately has been in the mid 60’s, which is too high for long term (24/7 humidity and temp meter running inside) storage. I bought the size rod for my safe that predicts to keep the humidity in the 48-52 % range if not a little better. Lifetime warranty and pennies a month to run it 24/7 365. Rod stays about 150 degrees to the touch. I am letting it run on my kitchen counter for 3 days to keep and eye on it since its new.
Anyone else here using one of these. Things to watch out for that I may not have considered? Obviously no Ammo on the rod itself, LOL!