An air moisture control system for a computer system includes a housing with an air passage and an air moisture control element with an adsorption material, which is exposed in the air passage so as to enable fluid communication towards and from the air moisture control element. The element is designed such that the adsorption material is adapted, in operation, to adsorb moisture from a first air flow flowing into the air passage, having a first temperature and a first relative humidity, and desorb moisture to a second air flow, said air flow having a second temperature at least 5° C. higher than the first temperature and a second humidity at least 3% lower than the first relative humidity.