How to Service and Clean Your Air Conditioner
Regular servicing and cleaning of your air conditioner keeps it running efficiently, extends its lifespan, and maintains healthy air quality in your home. This guide covers what you can do yourself and what requires a professional.
Why Regular Servicing Matters
A dirty, poorly-maintained air conditioner can lose up to 40% of its efficiency. This means higher electricity bills for the same level of comfort. Dirty filters restrict airflow, causing the compressor to work harder. Mould, bacteria and allergens can accumulate in filters and coils, then be blown into your living space. In extreme cases, neglected units can fail prematurely or even leak refrigerant.
What You Can Do Yourself: DIY Air Conditioner Cleaning
1. Clean the Air Filters (every 2–4 weeks)
This is the single most important maintenance task and takes only 5–10 minutes.
- Turn the air conditioner off and unplug it (or turn off at the circuit breaker).
- Open the indoor unit's front panel — it usually hinges upward or unclips.
- Remove the filters. They look like grey mesh panels.
- Tap the filters gently over a rubbish bin to remove loose dust.
- Wash under running water (cool to warm). Never use hot water or harsh chemicals.
- Allow the filters to air dry completely — never replace wet filters.
- Snap the filters back in and close the panel.
2. Wipe the Indoor Unit Exterior
Use a lightly damp cloth to wipe the front panel, louvres and air outlet. Do not spray water directly onto the unit. Keep the vents free of dust and obstructions.
3. Clear the Outdoor Unit
Check the outdoor unit (condenser) every few months. Remove any leaves, dirt, grass clippings or debris that have accumulated around or inside the unit. Ensure at least 30cm clearance around all sides. Never stack items against the outdoor unit. Never spray the coils with a high-pressure hose — the aluminium fins bend easily and restrict airflow.
4. Check the Drain Line
Your indoor unit removes humidity from the air, which drains away via a condensate drain line. Check occasionally that the drain line is not blocked — a blocked drain will cause water to drip from the indoor unit. If you see water dripping inside, check the drain tray and drain line. You can flush the drain line with a cup of water mixed with a small amount of bleach (diluted) to prevent algae build-up.
What Requires a Professional Service
An annual professional service is recommended for all air conditioners, particularly before summer. A professional service includes:
- Deep cleaning of the evaporator coils (indoor) with foaming coil cleaner
- Deep cleaning of the condenser coils (outdoor)
- Checking refrigerant levels and pressures
- Inspecting electrical connections and components
- Lubricating moving parts where applicable
- Testing operation across all modes
- Checking and clearing the condensate drain system
Signs Your Air Conditioner Needs Professional Attention
- Reduced cooling or heating output despite running normally
- Water dripping from the indoor unit
- Unusual noises (grinding, squealing, rattling)
- Ice forming on the indoor or outdoor unit
- Musty or unpleasant smell from the vents
- The unit switches off or displays fault codes
Service Frequency Recommendations
| Use Level | Filter Clean | Professional Service |
|---|---|---|
| Light (bedrooms, occasional use) | Every 4–6 weeks | Every 2 years |
| Regular (living areas, daily use) | Every 2–4 weeks | Annually |
| Heavy (commercial, ducted systems) | Monthly | Every 6 months |
Need a New Air Conditioner?
If your air conditioner is over 10 years old and struggling even after servicing, it may be time for a replacement. Modern inverter air conditioners can be 50–60% more energy-efficient than units from 10+ years ago. Contact Oceania Appliances at support@oceaniaappliances.com.au or visit our Wetherill Park showroom. Open 7 days 10am–8pm.