All collectors tend to be a bit obsessive by nature, and us classic computer nerds probably pick up more hardware than we can (or should) store in our residence — especially if the loves of our lives aren't as enthusiastic about the hobby than we are — and thus have storage units for the overflow. I have two small "cold" climate control units, kept small so that I can be out of one or both relatively quickly, as well as a larger "hot" conventional unit at ambient temperature. The hot unit is indoors and not exposed directly to the sun, so it's not particularly hot for sunny southern California, but I keep working spare electronics, hard disks, tapes, etc. in the cold units as a precaution and use the hot unit for non-working parts units, books, magazines and other household items.
Of course, climate control units cost more, sometimes substantially, and thieves use this as a signal that more valuable stuff is likely to be kept there:
