For slab floors, the U-value can be estimated by multiplying the perimeter heat loss coefficient by the building perimeter and dividing by the floor area. Heat retention in slab floors causes continuous heat loss. Seasonal distribution efficiency depends largely on blower operating hours. More research is needed to develop reliable comparisons of forced-air and hydronic heating distribution systems over complete heating seasons. Radiant floor heating blends nicely into energy-efficient home designs.
Radiant heating keeps the exposed floors warm and comfortable in winter.
Radiant floor heating offers other energy advantages. Radiant heating keeps the exposed floors warm and comfortable in winter. Hydronic zoning is more simple and less costly than for forced air systems. Since conventional air conditioning requires ducts, cooling is the greatest obstacle to hydronic heating. However, mechanical air conditioning is unnecessary in some climates with careful envelope design.