For you in hot areas, I, too, was concerned about that when we started here. We interviewed all the other managers in the area and found that those without climate controlled didn't seemed too concerned. Some people, like those who have pharmaceuticals, are required to have climate control. But I've learned that almost all other things do well in the heat, but it's the lack of humidity that causes wood to split.

We are in a hot area. An antiques dealer said, and we pass it along to our customers, "It's not the heat, it's the lack of humidity" the may damage their furniture. Therefore, we encourage our guests to put a bucket of water in their unit, near their wood (antique) furniture, along with an ounce of bleach. The bleach will prevent attracting little four legged animals. They need to replace the bleach once a month, and powdered bleach is good for this. We also recommend that they put a layer of furniture polish or furniture oil on their wood things prior to moving them in.

When guests are really concerned about their furniture, including their white couch, we give them a 10x20 plastic sheet. Or, you can sell it them one.

On other words, when someone says, "I need a climate controlled unit", ask them why.