This paper presents a part of the energetic audit for a painting hall. The audit was done first for assessing the energetic demands of the air conditioning units used for conditioning the air in the painting hall and second for assessing the overall energy consumption. The painting hall is used for painting large sections of metal parts. There were analyzed the structure of the building, the conditioning units and the process of conditioning the air correlated with the technological process in order to propose modern energy efficiency solutions. The audit finished with an efficiency solution. It was mounted an automatic control system for the air conditioning units.