Ducted Air Conditioning Service: How Often Should You Book One (And What’s Included)?

Your ducted system works hard through a Sydney summer and again through winter, yet most people only think about it when something goes wrong. If you are searching for a ducted air conditioning service Sydney homeowners can rely on, the first question is usually simple: how often do I actually need one, and what am I paying for?

Regular ducted air conditioning maintenance keeps your system cooling properly, keeps power bills in check and stops small issues (a clogged filter, a sticking zone damper, a slow refrigerant leak) from turning into expensive repairs. It also keeps the air your family breathes cleaner, because every bit of air in your home passes through that one filter and duct network.

In this guide, our team at Paragon Air explains how often to book a service, what a proper service includes, what you can safely do yourself, and what it should cost in Sydney.

How Often Should Ducted Air Conditioning Be Serviced?

For most Sydney homes, a professional ducted air conditioning service once a year is the right rhythm. Manufacturers generally recommend an annual service, and twice a year if the system runs hard or the home is near the coast, where salt air and humidity speed up corrosion.

As a rough guide:

• Once a year: typical family homes using the system in summer and winter.
• Twice a year: homes that run the aircon most days, large double storey homes, and coastal suburbs such as the Northern Beaches, Eastern Suburbs and Sutherland Shire.
• Before peak season: book in late winter or early spring so the system is ready before the first heatwave, when service calendars fill up fast.

Between professional visits, your filter needs attention too. Plan to clean or replace it every 6 to 12 months, and more often if you have pets, allergies or live near a busy road or building site.

If you notice weaker airflow, rooms that never reach temperature, new noises, water leaks or an error code on the controller, don’t wait for the annual service. Those are signs something needs attention now.

What Is Included in a Professional Ducted Aircon Servicing?

A proper ducted aircon servicing is far more than a filter wipe. When our licensed technicians service a ducted system, we work through the whole thing: the indoor unit in the roof, the outdoor unit, the ductwork, the zones and the controls.

A typical Paragon Air ducted service covers:

1. Return air filter: removed, inspected, cleaned or replaced.
2. Indoor unit (fan coil): check and clean the coil, fan and drain tray, and flush the condensate drain so it doesn’t block and leak through your ceiling.
3. Outdoor unit: clear leaves and debris, clean the condenser coil, and check the fan, electrical connections and mounting.
4. Refrigerant system: check operating pressures and temperatures and look for signs of leaks.
5. Zone dampers and controller: test each zone opens and closes properly, and check MyAir, AirTouch, iZone or wall controller settings.
6. Ductwork and vents: inspect visible ducts for damage, kinks, disconnections and air leaks, and check airflow at each outlet.
7. Performance test: run the system in cooling and heating mode and measure the temperature difference across the coil.
8. Report: we explain what we found, what is fine, and anything that needs fixing, with no pressure to go ahead.

That last step matters. A good service should leave you knowing the condition of your system, not just with a sticker on the unit.

How to Clean Your Ducted Aircon Filter Yourself

The return air filter is the one part of ducted air conditioning maintenance most homeowners can safely handle. It sits behind the large grille in your ceiling (usually in a hallway) and catches dust, pet hair and pollen before air reaches the indoor unit. Here is how to clean ducted aircon filter media properly:

1. Turn the system off at the controller and wait for the fan to stop.
2. Open the return air grille. Most have clips or turn latches. Use a sturdy ladder and have someone hold it.
3. Remove the filter carefully so dust doesn’t fall into the duct.
4. Vacuum both sides with a soft brush attachment to lift loose dust.
5. Rinse with lukewarm water if the filter is washable. Avoid hot water, detergents and pressure washers, which can damage the media.
6. Let it dry completely in the shade before refitting. A damp filter can encourage mould.
7. Refit and close the grille, making sure the filter sits flat with no gaps around the edges.

If the filter is torn, stiff, discoloured or still grey after washing, it is time for a replacement. Some filters are disposable and should never be washed, so check your manual or ask us.

What not to do: don’t open the indoor unit, touch the coil or spray cleaning products into vents. Those jobs need a licensed technician.

Do Air Conditioning Ducts Need to Be Cleaned?

Not every year, but they do need checking. If your filter has been maintained, the ducts stay surprisingly clean for a long time. Full ducted air conditioning cleaning (the ductwork itself, not just the filter) is worth considering when:

• dust visibly blows out of the vents when the system starts
• you have recently renovated, sanded floors or had building work nearby
• the filter was missing, damaged or badly neglected for a long period
• someone in the home has asthma or allergies that flare when the aircon runs
• there is a musty smell that a filter clean doesn’t fix
• the system has had a water leak or there was a pest problem in the roof

Our technicians inspect accessible ductwork during every service, so we can tell you honestly whether a duct clean is needed or whether it would be money wasted.

Can Mould Grow in Air Conditioning Ducts?

Yes, it can. Cooling pulls moisture out of the air, and that water collects on the indoor coil and drains away through the drain tray. If the drain is partly blocked, the tray holds water, or a filter stays damp, you get the warm, wet, dark conditions mould loves. Sydney’s humid summers make this more likely.

The most common places we find mould are the coil, the drain tray, the return air filter and the first section of duct near the indoor unit. Signs include black or green spots on vents, a musty smell when the system starts, and allergy symptoms that ease when you leave the house.

The fix is a professional clean and treatment of the affected parts, plus sorting out the cause (usually drainage or a dirty filter). Regular servicing is the best prevention, because the drain gets flushed and the coil gets cleaned before mould can take hold.

Why Does My Ducted Air Conditioning Smell?

Different smells point to different problems:

• Musty or damp: mould or bacteria on the coil, drain tray or filter. Book a service and clean.
• Dusty or burning dust: common for a few minutes when you first run heating after months off. If it lasts, the filter or ducts need cleaning.
• Burning plastic or electrical: turn the system off at the isolator and call a technician straight away.
• Rotten egg or sewer: often a dry drain trap or a dead animal in the roof space near the ducts. Needs inspection.
• Chemical or sweet: can indicate a refrigerant leak. Turn the system off and call us.

A smell that keeps coming back is your system telling you something. It is rarely solved by air freshener.

Does Skipping a Service Affect My Warranty?

It can. Most major brands, including Daikin, Mitsubishi Electric and Actron Air, offer manufacturer warranties of around 5 years on ducted systems, but those warranties generally expect the system to be installed and maintained according to the owner’s manual. If a fault is traced back to neglect (a blocked drain that flooded the unit, a coil clogged by years of dust), a claim may be harder to make.

A few practical tips:

• Read your warranty terms so you know what maintenance the manufacturer expects.
• Keep every service invoice. It is your proof the system has been looked after.
• Use a licensed technician for anything beyond filter cleaning. Work on the refrigerant side must be done by someone holding the right refrigerant handling licence.

Every Paragon Air installation also comes with our own 5-year labour warranty on workmanship. Regular servicing helps us spot and fix issues early, while they are still covered.

How Much Does a Ducted Air Conditioning Service Cost in Sydney?

As of October 2026, a ducted system service in Sydney typically costs between $210 and $580, with most homes paying around $345 (GST included). These are indicative market figures; your exact price depends on your system and what it needs.

What pushes the price up or down:

• System size and number of zones: more zones means more dampers and outlets to check.
• Roof access: tight or high roof spaces take longer to work in safely.
• Condition: a system that hasn’t been serviced in years usually needs more cleaning.
• Extras: filter replacement, drain repairs, mould treatment or full duct cleaning are priced separately.

When you search for a ducted air conditioning service near me, compare what is included, not just the headline price. A cheap “service” that only covers the filter can miss a blocked drain or a slow refrigerant leak, and those cost far more to fix later. A well maintained system also runs more efficiently; see our guide to ducted air conditioning running costs for how much that can matter on your bills.

Book Your Ducted Air Conditioning Service in Sydney With Paragon Air

Paragon Air is a family-owned Sydney business established in 2018, with more than 3,500 installations behind us and a licensed, insured team of over 15 technicians. We service all major ducted brands, including Daikin, Mitsubishi Electric and Actron Air, and we are authorised dealers for the systems we install.

We provide ducted air conditioning service across Sydney, from the Inner West, Eastern Suburbs and North Shore to the Hills District, Western Sydney, St George, the Sutherland Shire, Canterbury-Bankstown and Macarthur.

Why homeowners book with us:

• A thorough service checklist, not a quick filter wipe
• Honest advice on what needs fixing and what doesn’t
• A 5-year labour warranty on all our installation workmanship
• Repairs and upgrades (zoning, MyAir, AirTouch and iZone controls) handled by the same team

Don’t wait for the first heatwave. Call us on 1300 507 892 or book your ducted service online. Thinking about an upgrade instead? Learn more about our ducted air conditioning systems.

Frequently Asked Questions

How Long Does a Ducted Air Conditioning Service Take?

Most ducted air conditioning service visits are finished within a few hours. The exact time depends on the size of the system, the number of zones, how easy the roof space is to access and whether any faults turn up. Our technicians give you a time estimate when you book, so you can plan your day.

When Is the Best Time of Year to Service Ducted Aircon?

The best time to book is before the season you rely on it most. For most Sydney homes that means spring, ahead of the summer heat, and again in autumn if you use reverse cycle heating through winter. Booking early also helps you avoid the rush when the first hot spell hits.

How Often Does a Ducted Aircon Filter Need Replacing?

Clean or replace your ducted aircon filter every 6 to 12 months, and more often if you have pets, allergies or heavy use. A filter that is torn, warped or still discoloured after washing should be replaced. Our technicians check the filter and advise on replacement during every ducted aircon servicing visit.

Can I Service My Ducted Air Conditioning Myself?

You can handle the basics yourself, such as cleaning the return air filter and keeping at least a metre clear around the outdoor unit. Electrical checks, refrigerant work, drain cleaning and roof space inspections should be left to a licensed technician, as they involve safety risks and can affect your manufacturer warranty.

Does Ducted Air Conditioning Use Water?

No. Refrigerated (reverse cycle) ducted air conditioning does not use water to cool your home, unlike ducted evaporative systems. It does create condensation, which drains through a pipe from the indoor unit. A blocked drain can leak into your ceiling, so we check it during every ducted air conditioning maintenance visit.

Do You Offer a Ducted Air Conditioning Service Near Me?

If you live in Sydney, almost certainly. Paragon Air services ducted systems across the Inner West, Hills District, Sutherland Shire, St George, North Shore, Northern Beaches, Eastern Suburbs, Western Sydney, Canterbury-Bankstown and Macarthur. Call 1300 507 892 or book online for a ducted air conditioning service near you.