A surface-mounted, ceiling radiant heating system, an air-to-air heat pump system, and a monitoring data-acquisition system were installed in an occupied research home. Information on thermal comfort and energy consumption for alternating operation of the two heating systems was collected for approximately half of a heating season. This allowed a comparison of the radiant system and the more conventional air-to-air heat pump system. Data on energy consumption from a zoned electric baseboard heating system previously installed in the same house were available for comparison.KEYWORDS: year 1995, calculating, thermal comfort, energy consumption, ceiling heating, radiant panels, radiant heating, performance, energy conservation, comparing, air air heat pumps