What is one method used to maintain the efficiency of air filters?

Regularly replacing or cleaning filters is a crucial method for maintaining their efficiency. Over time, air filters collect dust, dirt, and other particulates, which can obstruct airflow and reduce their effectiveness in trapping contaminants. When filters are not maintained, they can become clogged, leading to increased resistance to airflow, which can cause the HVAC system to work harder and less efficiently.

By routinely replacing or cleaning these filters, it ensures that they continue to operate at optimal levels, supporting better air quality and system performance. This proactive approach can help prevent breakdowns and extend the life of the HVAC system, ultimately saving costs associated with energy inefficiency and repairs.

The other options, although they seem plausible, do not effectively contribute to maintaining filter efficiency in the same way. For instance, increasing the filter size may not always be practical and could lead to installation challenges, while heating filter material could damage it and lead to reduced performance. Decreasing airflow can result in inadequate air circulation, which is counterproductive to filter function. Hence, maintaining filters through regular replacements or cleaning is the most effective method.