I may need to store some gear in a storage unit for a period of a month or two, including a couple guitars and a couple basses. This will be Bay Area CA - either in San Francisco (chilly at times, not dry) or across the bridge around Sausalito (warmer but never too hot, also not too dry). These are not my main players, and nothing irreplaceable(the guitars are cheapos) but obviously I want them to survive. They'll be in cases. I assume it's wise to loosen the string tension a tad, keep them off the ground, but anything else I should consider? Do I need to put humidifiers in the cases for this kind of climate? Any tips appreciated.