The correct stabilisation of the environment is essential for preserving work or art over time. If canvasses were to constantly change dimension, paintings could be irreversibly damaged: in addition works made from wood or on parchment could start to deteriorate in a short time if the surrounding environment is too dry.
The problems relating to the hygroscopic characteristics of wood are further accentuated in the case of antiques or valuable items of furniture. Inappropriate humidity control will cause cracks in the wood, detachment of the joints in the furniture and separation of the decorations; in the case of paintings, the paint may peel.
For optimum preservation, the environment should be kept between 18-20°C with 45-50%rh. Maintaining stable conditions is also essential, which means the recommended ranges should be maintained twenty-four hours a day, 365 days a year.