This presentation examines the role of steam as an efficient and often underutilized medium for energy transfer in modern building systems. It compares conventional hydronic and steam approaches, highlighting differences in distribution efficiency, system complexity, and operational performance. The discussion explores strategies to simplify steam system design, improve heat recovery, and reduce maintenance requirements while increasing overall system efficiency. Real-world applications and system concepts are reviewed to demonstrate how steam can support resilient, low-carbon building infrastructure and future-ready central plant design.