This study was designed to present the preferred indoor temperature of college students in summer based on their body composition. A total of 19 subjects, 10 females and 9 males, participated in this study. They sat in a climatic chamber controlled at $27^{circ}C$ wearing a short sleeved shirt and short trousers. The air temperature decreased by $0.5^{circ}C$ every 10 minutes until it reached $24^{circ}C$. Oxygen uptake, rectal temperature, and skin temperature, subjective sensation were measured and recorded. Females increased the rectal temperature and decreased mean skin temperature in an air conditioned environment, showing better physiological responses. But they felt more thermal discomfort than males. The preferred indoor temperature of college students in summer was $25.3^{circ}C$, $25.7^{circ}C$ for females and $24.97^{circ}C$ for males.