Due to the necessity of transfer, the outer door of the transportation hub’s transfer hall is often kept open, resulting in significant cold air infiltration during the winter season, leading to increased heating energy consumption. This research utilized the air velocity measurement method, and air volume balance method to investigate the extent of cold air infiltration and indoor thermal comfort in a transportation hub transfer hall in Beijing during winter. The measured results indicated that during the winter test period, air permeability accounted for 57.6% of heat loss. Therefore, the cold air infiltration of the transfer hall in winter should be focused on.