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A calculation model has been developed to accurately estimate the heat transmission through the wall of the passenger compartment of a car. This calculation model estimate the specific heat flow by heat transfer into passenger cars using the calculated outside surface temperatures of the passenger compartment. If the real outside surface temperatures are known, the specific heat flow into the passenger compartment can be calculated precisely without compromising the physical properties of air near the outside surface of the compartment wall. The cooling load can be determined using the calculated outside surface temperature of a vehicle, in the earliest stage of a new car design.