Get the largest Goldenrod you can fit in there across the bottom and be done with it.
Amen. I have a very big safe that has been in an unheated space for at least 15 years. I put the biggest Goldenrod I could find in it when I got it and it has withstood temperature shifts from 100 down to about 14 degrees each year for all that time. Regardless what the outside temp is I can open that safe and the contents are warm and dry, with not one speck of rust over those 15 years. With the Goldenrod in there you can just fuggedaboutit.
SRH
