The aim of this Master Thesis is to construct the HVAC system using BIM. For that purpose technical documentation has been gathered in order to construct a 3D model in the software BricsCAD v19 and AX3000. For the constructed model, a list of components and pipe calculation is shown in software. In order to build the 3D model, it is essential to master working in above mentioned softwares. This task presents the characteristics of the modern HVAC systems as well as describes and provides a closer look at the significance of comfort parameters in the human living area. A distribution of the main elements of the HVAC has been made with a brief description of each. After the presentation of the significance of the HVAC in buildings, it is important to present BIM and what it represents in the modern world. The history of BIM shows that it has been present for 40 years, but the full potential of that methodology is being fulfilled at present. Throughout history, BIM has been generally shown with its advantages and disadvantages. In addition, the thesis explains what BIM is not in order to better understand what it actually is. After the construction of the model, a comparison with the real project of ventilation documentation has been made. Certain parts of the ventilation project have not been carried out according to the documentation which has been gathered. The model has not been changed so that the later connections inside buildings could be considered in accordance with the project abd the first calculations of the construction. Finally, the influence of BIM on making projects is shown, which represents the abstract of this whole thesis.