Keep your system running efficiently: how to replace a furnace filter correctly, how often to change filters, and the warning signs that tell you a filter is overdue.
A simple step-by-step guide to replacing your furnace filter correctly, including finding the slot, checking the airflow arrow, and choosing the right size.
Recognize the warning signs of a dirty air filter — weak airflow, rising energy bills, more dust, and longer HVAC cycles — and know when to replace it.