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Engine independent AC-systems, or parking cooling systems for non-idling air conditioning are getting more and more important, because extremely uncomfortable conditions during breaks or a disproportionate amount of fuel consumption for engine idling during breaks are not longer accepted. For cost, weight and package reasons today only thermal storage systems are ready for series production of in series production. The benefits (comfort and fuel savings) and test results of such a system are shown. Future developments of fuel cells or new alternator/battery-systems will probably change this evaluation.