The topic of this final paper is "Automatic humidifier". The paper will describe various designs of humidifiers, their division and the area of their application. The main division of humidification systems into industrial and commercial is made and their characteristics are described. Most attention is paid to the way in which each type of humidifier meets the requirements for humidity and their construction. The main mechanical parts of humidification systems used to humidify the air are described. Then, the electronic and software part of the system that regulates the operation of humidifiers is described, since this paper covers automatic humidification systems. At the end of the paper, there is an overview of the areas where humidification systems are applied and where they have the most beneficial effect. Due to the large area of application, the most common areas of application have been touched upon, their effect on improving production, the workplace or the health of employees in the company.