If you're a packrat (like me) then storage units are just the 'emotional' holding ground for stuff you should get rid of but just can't emotionally let go of yet for whatever reason (sentimental, still could be of use 'someday', etc).

Storage units aren't cheap when you figure the cost per year overall, particularly if you're just storing for emotional/sentimental reasons. Clutter costs in time AND money. Trust me after having been a packrat for years (still struggling) and having the largest storage unit the place had for 3 years filled top to bottom, front to back, I can tell you it's not economical, or convienent to be a packrat.

If this is the case for you then I STRONGLY recommend getting any of these books from your second hand bookstore or library and read them:

Books by Don Aslett

Lose 200lbs This Weekend

For Packrats Only (also released under the newer title 'NOT just for packrats only)

Clutter's Last Stand

Those 3 books helped me to downsize my sentimental but HUGE collection of stuffed animals that I've been storing for years along with a ton of other stuff I should never have been storing as long as I did.

If in fact you are not a packrat and will very soon in the future have a need for your items (soon to be moving will need furniture but don't have room for it now kinda thing) then a storage unit would be just your solution. Always check to see what their security policies are. Some are just open areas with locked garages, some have security codes/keys just to get in the gates as well as a lock AND coded keypad to get into your shed, and have security cameras as well.