The authors have researched hot air floor heating system with a wood pellet fan-heater. This paper describes its space heating effects of the first house with the system. Indoor vertical temperature difference was less than 1.5°C except the date with outside air temperature below 0°C. The globe temperature in the living room varied from 15°C to 25°C within the range of comfort globe temperature and that in the second floor’s room 11°C to 22°C. Temperatures of the lower surface of wooden floor surrounding the hot air outlet were kept below 43.1°C.
