The task of RAWO AK300 air-conditioning aggregate is to improve the climatic conditions in mine galleries especially in mine faces and longwalls. Machine can be operated in mine facilities in methaneless fields in excavations with no methane and coal dust explosion hazards. Device is able to control the supplied air’s temperature and humidity in order to optimize microclimate parameters in working place. Aggregate is designed with principles of good engineering practice in field of safety, it fulfils requirements of 97/23/WE, 2006/42/WE and 2006/95/RE directives. RAWO-AK300 is stationary device adopted to operate without regular personnel. Aggregate operation is fully automated and does require user’s intervention in operation and parameters.