How can weather affect ductwork in an HVAC system?

The impact of weather on ductwork in an HVAC system is primarily related to temperature fluctuations. As the temperature changes, materials used in the construction of ductwork, often metals or other materials like fiberglass, can expand when heated and contract when cooled. This thermal expansion and contraction can lead to physical changes in the ductwork itself, which may affect the integrity of seals and connections, creating potential for air leaks. These leaks can drastically reduce the efficiency of the HVAC system by allowing conditioned air to escape and unconditioned air to enter. Recognizing this effect is crucial for maintaining energy efficiency and optimizing system performance throughout different seasons.

In contrast, the other options do not accurately reflect the realities of how weather influences ductwork. The assertion that weather has no effect on duct systems disregards the fundamental principle of thermal dynamics. Humidity levels affecting sealing in the way suggested fails to recognize that while humidity can influence certain materials, it typically does not enhance sealing performance. Lastly, the concept that colder temperatures improve airflow does not hold up, as colder air is denser and may actually create hindered airflow rather than improving it.