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The NICMOS Cryogenic Cooler (NCC) is a turbomachine-based reverse-Brayton cycle cryocooler combined with a single-phase cryogenic heat transport loop. The NCC will be installed on the Hubble Space Telescope (HST) on a future servicing mission, and will provide refrigeration to the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) detectors that were previously cooled by a dewar of sublimating solid nitrogen. The NCC is designed to remove a total of 7 W of heat and maintain the NICMOS detectors at 77 K. The 7 W heat load is comprised of the dissipation from the NICMOS detectors and the parasitics into the heat transport loop. During testing of the NCC it was crucial to quantify parasitic heat loads in the heat transport loop since this governs the minimum temperature that can be achieved at the NICMOS detectors.