It was about in 2500 B.C, when slaves used to make the rooms cool by using water jars. It was started in the Egypt. They used evaporating cooling system to cool dry and hot places. After some years it became clearer by the hydrological and evaporation cycle of physics that how it works. These cycles of physics show the complete cycle of evaporation.

We all have the experience of evaporative cooler. Although the trend of using air cooler decreased to some extent and the air conditioners replace the air coolers. Everyone likes to have an air conditioner instead of an air cooler. There are many reasons behind this change.

In our country Pakistan the electricity shortage is the main problem and the main concern for the people of Pakistan. Electricity consumption is the main reason to shift from air cooler to air conditioner. Electricity consumption of both is almost same as both have two main parts that consume electricity. In air cooler one is motor pump that used to pump the water directed towards pads and the second one is its fan. Same is the case of air conditioner that has two parts external and internal units.
Due to global warming the temperature of the earth especially temperature of our region increased. So the air conditioner is the suitable option.
Air cooler only works in the areas where the humidity in the air is low.
Our generation is very lazy and don’t go for long procedures. There is need to fill water in air cooler because for cooling effect water pads need continuous supply of water while to start an air conditioner we have to just press a single button. Air cooler also needs to be clean on regular basis.
Many local manufacturers are manufacturing air cooler. But the quality of air cooler is low as they body of the air cooler is made up of low quality material that allow different substances to accumulate on the inner side of the cooler.

Favorable points
Price of air cooler in Pakistan is its favorable point as the air cooler is less expensive than air conditioner.
It is also a concept that air cooler consume less power because of its simple structure.
It is very easy to maintain air cooler due to its simple and visible parts. If there is any problem then one can easily solve the problem or cab be repaired at low cost.