A humid climate in a hospital can make mould form and bacteria spread. For example, condensation may form and drip down from the ceiling on humans or on the floor. It is therefore very important to have a controlled environment which dehumidified air gives as a result. The drier air is also experienced as pleasant to stay in, something that is very important, both for the staff but also for patients in a hospital. If drugs or other hygroscopic products, that are extremely moisture-absorbing, being handle the air must be controlled for their quality to be kept steady and high.