The article reviews the literature on the optimization of microclimate systems that provide comfortable conditions in a complex public building, which is a large shopping and entertainment center. In addition, a numerical study of the functioning of microclimate support systems in a shopping and entertainment center was realized. The study was conducted using the Sim- Scale cloud service, which includes the steps of creating a grid, sett ing boundary conditions, determining simulation parameters, numerically solving and processing the results. Modeling is performed using the RANS approach. As a result of a numerical study, zones with a reduced movement of air fl ows were identifi ed, areas with excess air velocity relative to normalized values were determined, which allows to optimize the microclimate system.