When does a fan typically activate in a heating system?

In a heating system, a fan typically activates when the temperature rises. This operation is critical for circulating warmed air throughout the space that needs heating, ensuring even distribution and maintaining comfort levels. As the heating elements warm up, the fan starts to blow air across them, allowing that air to pick up heat before being distributed into the living areas.

This process is essential for both efficiency and effectiveness in heating. If the fan did not activate at the right moment, the heated air would not be moved into the space, leading to uneven heating and potentially overworking the heating elements. Understanding the interplay between the temperature and the fan's operation is vital for anyone working in HVAC systems, as it directly impacts comfort and energy efficiency in heating applications.