What is the difference between air cooler and AC?

Answer 1

Aircooler cools the air by adding water to the air in the form of tiny droplets with the help of air passing through the water filled filters. On the other hand AC increases or dicreases the temperature of the air with the help of compressor as per the requirement. Although answer 1 is not incorrect, it is somewhat incomplete. The "aircooler" [when I was a child it was refered to as a "swamp cooler"], uses a fan to draw warm outside air through a water wetted filter medium, where the heat of the incoming air enhances evaporation of SOME of the water. The evaporated water is blown into the house, raising the humidity [not good]. The evaporation of the water absorbs some of the heat from the air, reducing its temperature. the efficiency of swamp coolers depend on the incoming air being relatively dry, or preferably having a very low relative humidity. The higher the ambient air relative humidity, the less efficiently the swamp cooler works. On the other hand, a mechanical air conditioning system utilizes a REFRIGERANT, in a closed system which REMOVES heat from the interior air [circulated through the EVAPORATOR COIL by a fan], which carries the heat to the outside CONDENSOR COIL which transfers the heat to the outside air being circulated through that coil with another fan. Since mechanical air conditioning does not rely on the cooling effect of evaporating water, its efficiency is not as dependent on the relative humidity. In the process of removing heat from [cooling] the interior air, it also condenses much of the moisture out of the interior air, thus reducing the indoor humidity, and allowing a person to feel cooler at a higher thermostat setting.j3h.