What is the minimum indoor temperature required for spaces intended for human occupancy on design heating days?

The minimum indoor temperature required for spaces intended for human occupancy on design heating days is established to ensure comfort and health for occupants. The most widely accepted standard suggests that this minimum temperature should be no lower than 68°F. This standard is based on considerations of human comfort, energy conservation, and the prevention of health issues related to exposure to cold environments.

Maintaining a temperature of at least 68°F helps ensure that individuals can engage in their activities without discomfort, supports well-being, and reduces the risk of hypothermia or other cold-related health risks. Therefore, the significance of 68°F as the minimum temperature is widely recognized in building codes and standards to promote safe and comfortable living conditions during the heating season.