Air Conditioner Maintenance: Complete Guide for Homeowners

Regular maintenance keeps your air conditioner running efficiently, extends its life, and helps prevent costly repairs. Here's what Australian homeowners need to know.

Why Maintenance Matters

• Lower energy bills: A clean, well-maintained unit runs more efficiently


• Longer lifespan: Regular care can add years to your system


• Better air quality: Clean filters mean cleaner air


• Fewer breakdowns: Catch problems before they become expensive

DIY Maintenance Tasks

Monthly Tasks

Clean or replace filters
This is the most important maintenance task. Dirty filters:


• Reduce airflow and efficiency


• Strain the system


• Worsen air quality

For split systems, slide out the filter and wash with warm water. Let it dry completely before reinstalling.

Clear area around outdoor unit
Keep at least 50cm clearance around the outdoor unit. Remove leaves, debris, and overgrown plants.

Quarterly Tasks

Clean indoor unit exterior
Wipe down with a damp cloth. Clean air vents and louvres.

Check drainage
Ensure the condensate drain isn't blocked. A blocked drain can cause water leaks.

Annual Tasks

Professional service
Book a professional service once a year. They will:


• Check refrigerant levels


• Clean coils


• Inspect electrical connections


• Test all functions


• Identify potential issues

When to Call a Professional

Contact a licensed technician if you notice:


• Reduced cooling/heating performance


• Unusual noises (grinding, squealing, banging)


• Water leaking from the unit


• Ice forming on the unit


• Unpleasant smells


• Higher than normal energy bills


• Unit not turning on

Seasonal Preparation

Before Summer



• Book a service in spring


• Clean filters


• Test the system before hot weather arrives


• Clear outdoor unit

Before Winter (if heating)



• Service the system


• Check heating function


• Clean filters

Cost of Neglected Maintenance

Skipping maintenance leads to:


• 5-25% efficiency loss


• Shortened system life


• Expensive repairs


• Higher energy bills


• Poor air quality

A $150 annual service can prevent thousands in repairs or early replacement.

Maintenance Checklist

□ Clean filters monthly
□ Clear outdoor unit monthly
□ Wipe indoor unit quarterly
□ Check drainage quarterly
□ Professional service annually
□ Check for unusual sounds/smells

Use our service cost calculator to estimate professional servicing costs in your area.