Blinds or shades are important for preventing heat loss at night. Clear skylights tend to lose a large amount of heat toward the night sky in winter, a principle called “clear-night-sky re-radiation.”

Amazingly, the area around a skylight can drop 5 to 10 degrees below ambient temperatures due to this phenomenon. A shade or blind can help minimize this heat loss.Most operable skylights include insect screening that mounts below the opening; some fiberglass insect screens reduce UV rays by up to 70%. Following are the main types of skylight shades and blinds