How to Clean Your Split System Filter

Your split system's air filter is the first line of defence against dust, pollen, and airborne particles entering your system. When it becomes clogged, your unit has to work harder to pull air through — reducing efficiency, increasing running costs, and in some cases leading to expensive repairs. The good news: cleaning it takes less than 10 minutes.

How Often Should You Clean Your Filter?

As a general guide, clean your filter every 4–6 weeks during periods of heavy use (Queensland summers and winters), and every 8–12 weeks during milder periods. Homes with pets, high dust levels, or residents with allergies or respiratory conditions should clean more frequently.

Many manufacturers include regular filter cleaning as a warranty condition — it's worth checking your product documentation. Neglecting the filter is one of the first things a technician will check when diagnosing a performance issue, and can void your warranty.

What You'll Need

• ●A vacuum cleaner with a soft brush attachment
• ●Access to a tap or outdoor hose
• ●A clean towel or drying rack

Step-by-Step

• ●Turn the system off at the unit (not just the remote) and allow it to sit for a few minutes.
• ●Open the front panel of the indoor unit — most models have tabs or a lift-up cover. Refer to your manual if unsure.
• ●Slide the filter(s) out carefully. Most split systems have two filters, one on each side.
• ●Take the filters outside or to a laundry sink. Tap them gently to dislodge loose dust.
• ●Vacuum the filters using the soft brush attachment, working from the clean side through to the dirty side.
• ●If heavily soiled, rinse under lukewarm water. Do not use hot water, detergents, or a pressure washer.
• ●Allow the filters to dry completely in the shade. Do not reinstall wet filters — this promotes mould growth inside the unit.
• ●Slide the clean, dry filters back in, close the panel, and restart the system.

Signs Your Filter Needs More Than a Clean

If your filter is damaged, warped, or has holes, it needs to be replaced. A damaged filter allows dust to bypass and settle directly on the indoor coil — which requires a professional coil clean to rectify. Contact your unit's manufacturer or a licensed air conditioning technician for the correct replacement part.