Materials are damaged when exposed to high relative humidity. Most materials will be preserved and unaffected at humidity levels below 50%. The only reliabel protection, irrespective of weather conditions, is dry air produced by a desiccant dehumidifier.
Dehumidification versus heating
Heating is a common method for trying to control the relative humidity. Temperature has no impact on the quality of the materials and as the relative humidity in a heated store will fluctuate between 20-70%RH depending on the outdoor conditions, this method is both ineffective and costly.
In a dehumidified store the relative humidity can be controlled and constant throughout the year - completely independent of the outdoor conditions. heating can be reduced or closed down, the stored materials will keep their high quality, meaning less waste and less loss.
General storage around the world - protected by Munters