What impact do dirty air filters have on an HVAC system?

Dirty air filters in an HVAC system significantly restrict airflow and reduce overall system efficiency. When air filters accumulate dust, dirt, and debris, they create a barrier that obstructs the flow of air. This blockage forces the system to work harder to pull air through, leading to an increase in energy consumption. Consequently, this can cause the system to run longer than necessary to achieve the desired temperature, thereby decreasing its efficiency.

Moreover, restricted airflow can lead to uneven heating or cooling throughout the space being conditioned, which may result in some areas being too hot or too cold. In the long term, this increased strain on the HVAC system can lead to wear and tear on mechanical components, possibly resulting in more frequent breakdowns or a shorter lifespan for the system.

In contrast, clean air filters allow for optimal airflow, promoting efficient operation and supporting system longevity. The other options, which suggest improved airflow, no impact, or enhanced longevity, do not accurately reflect the consequences of having dirty air filters in an HVAC system.