principle of water cooling
The higher environmental temperature is, the lower the humidity and decrease effect is more obvious.
This product makes use of water as its secondary refrigerant. It is used to remove heat from the water, which is then circulated through other components to absorb heat from the space. Water flows over a pad, and a fan blows air through the wet pad into the building. This process is repeated in order to provide humid and cooler air in a room.