When #storing extra stuff in the attic, remember that the area is subject to rapid changes in heat and humidity that can damage the things you want to store, Reader’s Digest says. Excess heat and humidity will ruin photos and fine art fast, as well as dry out wooden furniture and musical instruments. Books and electronics are also vulnerable to rapid changes in heat and humidity. Keep such items in a climate-controlled room or storage unit. To avoid fires, never put batteries, aerosol cans and other flammable items in the attic. Attics can easily be 40 degrees hotter than occupied areas of the home.