Climate Comtrolled units are units where the climate,or tempature, is controlled.

The Climate Controlled units are recomended for indivduals that are storing Leather, Artwork, Antiques, Electronics, or any of your possitions that may become harmed or damaged by the extreme hots and colds.

If you think you MAY need a climate controlled unit you probably do. So i would stay on the safe side and stick with the Climate Controlled units. I wouldnt want my sons baby things put outside in the garage, Id rather  have the inside in the closet.