The PolyCool 4-in-1 8 Litre Portable Evaporative Air Cooler is truly the smart portable cooling solution for households. The evaporative cooling process produces cool air by cycling the water, which is up to 6 times more energy efficient than traditional air conditioners. As air is drawn through the filter it gets purified and freshened. You also have the flexibility to position it anywhere as it requires no window ventilation ducting.