Best way, if needed, to dehumidify storage room?
I think a small dehumidifier in the storage room would be the best choice. If the temp is two low for a dehumidifier to work I would think maybe putting DriZair pots like the link shows would work. We use Drizair in our motor home when we are not using it and we only have problems if we forget to put the crystals in every month or so.