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Message: [QUOTE="Conndog, post: 4415192, member: 5939"] I know it seems counter-intuitive, but if I understand it properly, it’s radiant energy from the heated water that heats the air above the floor, and then heated air rises. With heated water in ceiling pipes (the same ribbon like network used in floors), the radiant energy radiants downward and heats objects below. Insulation above the ceiling pipe network keeps the radiant energy reflected downward. The ceiling lets the heat energy conduct through it. At least, that is my understanding of it. [/QUOTE]