This paper examines the application of computer-based energy modeling and simulation tools in the analysis of building energy performance. The research is based on a comparative case study of two buildings, where detailed 3D models and energy simulations were developed using real data on construction systems, materials, heating, cooling and ventilation systems, as well as local climatic conditions.

The simulation results were compared with the actual energy consumption data for thermal and electrical energy on both monthly and annual levels. The analysis indicates a high level of agreement between simulated and measured values (over 90%), confirming the accuracy and reliability of the applied methodology. In addition to energy consumption, the simulations provide detailed insight into the thermal behavior of the buildings, including heat losses and gains, envelope performance, and CO₂ emissions.

The findings demonstrate that energy simulation tools represent an effective approach for analyzing, evaluating, and improving building energy performance, with significant potential for application in both research and engineering practice.