How to store wood furniture. Humidity levels that are too high will cause wood to rot. It’s more prone to warping and decaying as a result. Furthermore, if the storage conditions are excessively dry, the wood may break. Extreme temperature swings and high humidity are the worst environments for storing wooden furniture or other expensive goods made of wood. In an attic, garage, or basement, wood may not be suitable. Humidity fluctuations cause the wood to swell and then compress. This could result in cracks. Fine woodwork finishes can be harmed by temperature variations. It can modify the color of stains and lacquer, as well as create fine lines to form in varnishes, reducing their smoothness. Store wood furniture somewhere that is climate controlled to prevent this.