Frequently modern temples have certain problems with heating and ventilation, despite the strict design rules and the installation of religious buildings. There is a necessity to organize proper air exchange and ensure proper heating of the air throughout the space in a complex building. Moreover, to calculate the geometry of natural flows and supply jets, ensure the removal of polluted air bypassing crowded areas and the most important thing is to protect wall paintings and art objects from sedimentation of soot particles and dirt. Using the method of electronic digital modeling, the effectiveness of the proposed model of temple ventilation was confirmed, which is able to provide maximum protection and preservation of the interior decoration and works of art in the room at any mode of operation. Using the created model, specific design characteristics of ventilation and air heating systems were obtained and evaluated. Based on this, it was proposed to develop a project for their reconstruction.