What effect does airflow resistance have on an HVAC system?

• A. It improves efficiency
• B. It creates additional cooling
• C. It makes the system work harder
• D. It has no effect

Answer: (C)

Airflow resistance plays a significant role in the performance of an HVAC system. When airflow is restricted due to high resistance, such as from dirty filters, undersized ducts, or blockages, the system has to exert more energy to maintain the desired airflow rates. This increased workload can lead to several consequences, including reduced efficiency and increased energy consumption.

When the system works harder to overcome the resistance, it can also contribute to wear and tear on components like the blower motor and compressor, potentially leading to more frequent maintenance or repairs. Moreover, the overall comfort in the space may diminish, as inadequate airflow can result in uneven temperatures.

Understanding the impact of airflow resistance helps HVAC professionals ensure systems are designed and maintained optimally for effective performance and energy efficiency.