The thermal comfort response of Korean college students was investigated in a thermalenvironment chamber both in summer and winter seasons. Eight thermal conditions consistingof four air temperatures (24, 26, 28, 30C) and three relative humidities (40, 60, 80%) wereselected in summer. Eight thermal conditions consisting of five air temperatures (18, 20, 22,24, 26C) and two relative humidities (40, 60%) were chosen in winter. In each test, sevenfemales or seven males were questioned in the chamber for 3 h, where thermal and comfortsensations were surveyed every 15 min. To check the repeatability of thermal sensation for thesame thermal condition, the same experiments for two cases were repeated twice. The thermalsensation votes of subjects were compared with the predicted mean votes. The correlationbetween thermal sensation votes and comfort sensation votes of subjects were discussed. Theseasonal difference in thermal response was also addressed.