Industrial air conditioners maintain temperature and humidity within the operating limits in environments where heat, dust and aggressive atmospheres would compromise the operation of the equipment and the permanence of the operators. Typical applications are crane-deck cabins, maneuvering stages, switchboards and electrical booths, control booths, containers and shelters, operating rooms and cleanrooms. In these contexts, the overcoming of the thermal thresholds of operation determines the intervention of the protections of electronics, the degradation of the components and the impossibility of operating. The choice of the equipment must therefore be made on the real parameters of the environment.