A standard ceiling fan rotates to enhance the flow of air in the room so that that sweat can be evaporated faster from your body.
Fans are not able to operate in closed surroundings and in such areas where air-speed exceeds 6.4 km per hour.
If ambient heat exceeds the temperature of the body (37 ° C), the body is heated rather than cooled by the rotating fan.
On the other hand, air coolers have a tangible refrigerating effect on the air. It substantially decreases the room temperature by bringing moisture into the air and circulates it efficiently.
Although a fan may only affect the comprehensible temperature of our body, whereas an air cooler will decrease the indoor temperature by almost 5 degrees centigrade.
It is based on evaporation cooling, a technique that is more efficient and coherent than circulation techniques.
Air coolers are also much quieter than standard conventional fans.