Evaporative cooler air conditioning is one of the oldest known procedures and technically defined as an air adiabatic cooling process, or total constant heat or enthalpia air cooling process It consists in letting not-saturated air pass through a damp surface to take it as close as possible to the saturation point, therefore decreasing the temperature of the dry bulb. The capacity of the wetting surface to treat that a r ts called saturation efficacy or efficiency and depends on two main parameters: – The type. kind, thickness, etc., of the material used as a wetting module. – The speed at which the air passes through that surface. The combination of these two parameters in appropriate terms will be the main vasts for the manufacture of an air conditioner by evaporation system.