How to Keep Your Air Conditioner Running Efficiently: Annual Maintenance Guide
A split system air conditioner that's well-maintained runs up to 20% more efficiently, lasts significantly longer and maintains better air quality than a neglected one. Most maintenance tasks are simple DIY jobs that take less than 30 minutes. Here's what to do and when.
Monthly: Clean the Indoor Unit Filter
The air filter in the indoor unit captures dust, pet hair, pollen and other particles. A clogged filter restricts airflow and forces the unit to work harder. How to clean it: Open the front panel (usually lifts or slides off), slide out the filter, wash under cool running water or vacuum with a brush attachment, leave to dry completely, then reinsert. For heavy pollen seasons or households with pets, clean fortnightly.
At the Start of Summer: Full Pre-Season Check
Do this in October or November before the heat arrives:
- Clean the indoor filter (see above)
- Wipe down the indoor unit's exterior vents with a damp cloth
- Check that the outdoor unit is clear of debris, leaves and vegetation (leave at least 30cm clearance around it)
- Turn the unit on in cooling mode and verify it cools properly before you need it urgently
- Test all modes — cooling, heating, fan, dry
- Check that the remote control batteries are fresh
Annually: Professional Service
Every 2–3 years (or annually for heavy use), have a licensed technician service the unit. A professional service includes:
- Checking and cleaning the evaporator and condenser coils (not user-accessible)
- Checking refrigerant pressure
- Inspecting electrical connections
- Lubricating moving parts
- Checking the condensate drain for blockages
Signs you need a service sooner: the unit takes longer to cool the room, there's an unusual smell when running, water is dripping from the indoor unit, or the unit is making new noises.
Clearing the Condensate Drain
The condensate drain removes water collected from dehumidification. A blocked drain causes water to back up and drip from the indoor unit. If you notice water dripping inside, check whether the drain outlet (outside) is dripping normally while the unit runs. No drip = possible blockage. This requires a technician to clear.
Outdoor Unit Maintenance
Keep the outdoor unit clear of leaves and vegetation. Don't cover it or store items on top. Ensure it has adequate airflow. In summer, you can gently rinse the fins with a garden hose (not a pressure washer) to remove dust and improve efficiency. Never use a high-pressure cleaner — it bends the fins.
Need a Service or Repair in Sydney?
Oceania Appliances provides air conditioning supply, installation and service across greater Sydney. If your unit needs attention, call 0481 243 211. We also stock replacement split systems if your existing unit is beyond economical repair. Showroom: 2/14 Centre Place, Wetherill Park NSW 2164. Open 7 days.