In low-energy and low-exergy buildings, radiant heating and cooling are known to have a good track record of energy efficiency in terms of the first-law of thermodynamics. With recent concerns of global warming and environmental degradation however, quality of energy aka exergy balance between the supply and demand in terms of the second-law of thermodynamics is also becoming a dominant factor. Especially in radiant panel heating and cooling a new metrication that may guide the designer to choose the right supply chain for both quality and quantity of energy is needed in order to realize the benefits of radiant heating and cooling and to recognize potential limitations.