The exergetic assessment system of air-conditioning refrigeration plants will be tested and further developed with the «Proof of Concept». Furthermore, if feasible, first reference key figures of subsystems will be generated. With clearly defined selection criteria, 15-20 air-conditioning cooling systems, in regard to their instrumentation and data storage systems, are evaluated. Thus, for future investigations, measurement concepts will be developed as well as subsequent cost and time efforts determined. Finally, the suitability of the method for a broad application can be assessed.