From 1950 and until today, building technology has developed continuously, especially concerning insulation and sealing (2). Therefore the Norwegian houses of today resist cold and wind very well. But there are still factors that can provide thermal discomfort. Some of these factors can for instance be open indoor solutions, placement and number of windows and sources of heat, upgrading and maintenance of old houses. Important thermal parameters are draught and air velocity, vertical air temperature differences, asymmetry of thermal radiation, floor temperature and relative humidity (4).