Building systems have traditionally been separated from architectural design, existing as add-ons to a building. The conceptual folly Pipecycle integrates radiant-based thermally active building systems into architectural space-making with a closed-loop hydronic pipe system that embodies various levels of surface emissivity, which strategically absorbs, rejects, or emits heat, thereby creating distinct thermal spaces. This paper presents outdoor testing of a proof-of-concept prototype and analytical model to demonstrate surface emissivity control with significant heat recovery from black-coated pipes and cooling potential from PVDF-coated pipes. A discussion explores practical challenges and opportunities for scaling up the technology in the architecture, engineering, and construction industries through a theoretical design that illustrates the potential for large-scale energy exchange using radiant systems.