Air Filter

The air filter inside your indoor air handler catches dust, pet hair, and debris before they reach the coil. Most mini split filters are washable mesh screens — you slide them out, rinse them off, and put them back. They're not meant to be thrown away. How often you need to clean them depends on how much you run the system and what's in your air. A good rule of thumb is every 2–4 weeks during heavy use. A clogged filter restricts airflow, which causes the evaporator coil to ice over and can lead to water leaking from the unit. It's the easiest maintenance item to stay on top of.