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Although the Shuttle cargo bay parking phase is only a transition phase for ESA's European Retrievable Carrier (EURECA), it can last long enough (up to five days) to be the determining factor for the spacecraft thermal design. Both the thermal behaviour of safety critical (e.g. avoidance of hydrazine freezing and subsequent thawing, which might cause rupture of lines and valves) and temperature sensitive items have to be determined under consideration of hot and cold conditions for EURECA. Because the configurations of the Shuttle co-payloads are not known at the present time, hot and cold locations of EURECA within the cargo bay were identified. The position of EURECA in the middle of an otherwise empty cargo bay was determined as the cold location, whereas a sandwiched position of EURECA between two co-payloads was identified as the hot location.