Nakano and Tanabe studied reactions to air temperature in urban semi-outdoor environments, such as atria, terraces, and sidewalk eating areas. They determined that “Clothing adjustments showed higher correlation with outdoor temperature, not the immediate environment. Occupants in non-HVAC spaces were more responsive to their environment. . . . The comfort zone . . . was found to be 19 - 30°C for HVAC spaces and 15 - 32°C for non-HVAC spaces."
Junta Nakano and Shin-Ichi Tanabe. “Thermal Adaptation and Comfort Zones in Urban Semi-Outdoor Environments.” Frontiers in Built Environment, in press, doi: 10.3389/fbuil.2020.00034