How does daylighting influence energy codes and occupant comfort?

• A. It has no effect on energy codes.
• B. It increases artificial lighting energy use.
• C. It reduces artificial lighting energy use and improves comfort but requires shading controls to prevent glare and overheating.
• D. It only affects aesthetics.

Answer: (C)

Daylighting interacts with energy codes and occupant comfort by enabling automatic lighting controls that dim or switch off electric lighting when enough natural light is present. When designed well, daylighting reduces artificial lighting energy use and can enhance occupant comfort through better light quality, more natural daylight, and views that support well-being. However, daylight can also cause glare and excessive solar heat gain if not properly managed, which can lead to visual discomfort and higher cooling loads. Energy codes typically require daylight-responsive controls and appropriate shading strategies to ensure energy savings while maintaining comfort. So, daylighting is beneficial for both energy efficiency and comfort, provided shading and control measures are in place to prevent glare and overheating.