According to ASHRAE 55, the vast majority of the available thermal comfort data pertains to which activity level?

• A. Highly active exercise
• B. Sedentary or near sedentary levels of typical office work
• C. Sleeping
• D. Heavy manual labor

Answer: (B)

Thermal comfort data are interpreted through the lens of how much heat the body is producing, which depends on activity level and clothing. Most of the available data come from studies conducted in office-type environments where occupants are sedentary or only mildly active. This creates a consistent, repeatable dataset because metabolic rates are relatively stable and easier to control in these settings. In contrast, highly active exercise or heavy manual labor introduce wide variations in heat production, clothing choices, and environmental conditions, making standardized data much harder to collect and generalize. Sleeping has a different metabolic profile and thermoregulation pattern, so it isn’t represented as the dominant body of data for typical indoor comfort assessments. Hence, the majority of thermal comfort data pertain to sedentary or near-sedentary levels of typical office work.