LG portable air conditioners do not need water for cooling. Unlike some evaporative coolers, LG portable AC units are designed to cool using a refrigeration system. They extract heat and moisture from the air and then expel the hot air through the exhaust hose, leaving behind cool and dehumidified air in the room. Therefore, you don't need to add water or perform any water-related tasks for the cooling process. Simply ensure the unit is properly ventilated.