Evaporative air cooling is the natural way of cooling, similar to breeze flowing across the lake. The breeze lowers the temperature and has relaxing cooling effect on people. An evaporative air cooler cools the air by means of the evaporation of water. When water evaporates into the air, the result is a mixture of air and water molecules. This chemical change requires heat, thus energy or latent heat is taken from the air. When warm, dry air enters into an Avis Hitek Air Cooler, it passes through a Carbon Dust Filter which helps prevent dust and unwanted particles from entering the cooler. The air then enters the wet. Honeycomb Cooling Media where it evaporates. This newly moisturized and cooled air I then propelled into the room by a powerful fan. An evaporative cooler work best when placed near an open window. Fresh air drawn into the cooler, circulate in the room and exits via the door or window opening. Fresh air circulation can be beneficial and can help to avoid indoor pollution that can often build up in enclosed environments such as office buildings or warehouses. Avis Hitek Air Coolers help to bring a new, moisturized, cool air while old, dry and stale air is circulated out of the room.