Comfortable for human life constitutes the ideal environment 40-60% relative humidity conditions. Sometimes it outside environmental conditions need to be brought to these values or process required to add moisture to the environment or moisture may need to take.

To increase humidity in the environment of water or steam can be sprayed to the medium. It can be administered in the free moisture can be injected into the ventilation system.

To reduce humidity, ventilation, heating and cooling processes can be applied one or more than one. Established it decides automation.