useful source

At the library, is it important that the environment is not too moist. Large variations in temperature and humidity can cause condensation or cracking in the books. Organic materials contain micro-organisms that can be brought to the strife of moisture and heat. Even microfilm benefit from a dehumidified climate, then it is an easy way to preserve them. A dehumidified climate also do so there is no risk of mold, it improves indoor air quality while avoiding the costs of heating, ventilation and air conditioning after closing.