Category checklist · Melbourne
Air Conditioning Maintenance Checklist for Melbourne Homes
Melbourne's four-seasons-in-one-day climate means air conditioning units work harder than almost anywhere in Australia. Ducted systems and split systems both accumulate dust, mould, and reduced efficiency when not maintained — leading to higher power bills, poor indoor air quality, and eventual system failure. This checklist covers the four observations that reveal most common HVAC problems before they escalate.
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- 1 Remove and inspect your split system's filter panel: heavy dust accumulation, discolouration, or visible mould growth are signs the system needs professional service.
- 2 Run your ducted system and walk each room — uneven airflow, musty smells from vents, or rooms that fail to reach the set temperature all indicate blockages or system issues.
- 3 Listen for unusual noises during operation: rattling, grinding, or high-pitched sounds suggest loose components, debris in the unit, or failing motors.
- 4 Check that your outdoor compressor unit is clear of debris, vegetation, and that fins are not visibly bent or blocked — restricted airflow reduces efficiency significantly.
Warning Signs to Look For
- Musty or mouldy smell when the system runs
- Visible black spots or discolouration on filter panels
- Reduced airflow from vents compared to previous seasons
- Water leaking from indoor head unit
- System running constantly without reaching set temperature
- Ice forming on refrigerant lines or outdoor unit
Cost of ignoring
Neglected air conditioning systems can produce airborne mould spores that affect respiratory health, particularly for children and people with asthma. Efficiency losses from dirty filters and coils typically add 10–25% to running costs. Full ducted system replacement in Melbourne ranges from $8,000–$25,000 — routine servicing every 1–2 years costs $150–$400 and prevents most premature failures.
Frequently Asked Questions
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How often should split systems and ducted systems be serviced in Melbourne?
Split systems should be serviced every 1–2 years. Ducted systems with gas heating components should be serviced annually by a licensed technician. Filter cleaning every 3–6 months can be done by homeowners.
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Is mould in an air conditioning unit dangerous?
Yes — mould spores circulated through a ducted system can affect the entire home's air quality. If you notice a musty smell or see visible mould near vents, book a professional clean promptly rather than continuing to run the system.
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Why is my ducted system causing high electricity bills?
Common causes include dirty filters restricting airflow, refrigerant leaks reducing efficiency, aging compressors, and poor duct insulation. A service technician can diagnose the cause — often a clean or refrigerant top-up resolves the issue.
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