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The paper presents results about a decreasing of a cooling demand in the selected office building where the night ventilation/pre-cooling of building construction is used. The energy saving is about 10 - 15% in comparison with operation of this Office building without using of night ventilation/pre-cooling of building constructions. Mechanical ventilation is used in this selected Office building and the airflow volume was calculated by using the technical standard STN EN 16798-1. These results we got by using ener...