The answer to 'when to service air filter' is that you should clean or replace your HVAC air filter every 1-3 months, depending on usage and indoor air quality. Dirty air filters restrict airflow, causing your HVAC system to work harder and use more energy. Regularly servicing the air filter helps maintain efficiency, improve indoor air quality, and extend the life of your HVAC equipment.
To service the air filter, first turn off power to the HVAC unit. Locate the filter, which is typically in the return air duct or the air handler. Carefully remove the filter and inspect it. If it's dirty with dust, pet hair, or other debris, replace it with a new filter of the same size. If it's just lightly dirty, you can clean it by vacuuming or rinsing with water. Be sure to let the filter fully dry before reinstalling it. Set a reminder to check and service the filter every 1-3 months to keep your HVAC system running at peak performance.