Evaporative air cooling is the natural process of cooling, similar to wind flowing across a lake.

Most of us have felt the effects of evaporative cooling. When you exit the water after swimming, the water that is left on you evaporates and cools you off. The same principle can be used to cool your home.

When hot, dry air comes into contact with water, the air loses some of its heat to the water. This in turn causes the water to evaporate (change from a liquid to a gas). The water vapor is absorbed into the air raising its' relative humidity. As the air is pushed through cooling pads, the water evaporates and the heat in the air is absorbed, which lowers the air temperature. A fan pushes the cool air throughout the room via a filter of ducts.

Many air coolers today come with dedicated trays for adding ice cubes which helps in chilling the water and providing powerful cooling. You can place ice cubes in the ice tray, and the melted ice will mix in the water tank. This ice-cold water will reduce the water temperature, cooler the pads and ultimately cools down the air.

The best thing about using an air cooler is that you can keep the doors and windows partially open to ensure a constant circulation of fresh air. Thus it is the most viable & economic option for cooling large & open areas. This basic system can be used to cool the home but it has some limitations. In area where the outdoor relative humidity is above 50%, these units are less effective.