Why the filter matters
The filter is designed to catch dust before it moves further into the system. Energy Rating notes that dirty filters can significantly reduce airflow and efficiency.
What to compare after cleaning
Once the filter is clean and dry, compare the airflow with normal operation. Notice whether the unit still smells stale, struggles to move air or has visible buildup deeper inside the opening.
Know the boundary
Home maintenance should stay with the accessible filter and manufacturer guidance. Do not spray household products into the electrical or internal airflow sections to chase an efficiency problem.
The practical takeaway
A clean filter is worth doing regularly. Persistent weak airflow is a reason to inspect the system more closely, not a reason to keep adding chemicals.