Choosing the right ducts for your air conditioning system isn’t just a technical decision – it’s a key factor in how well your home stays cool, how efficiently your system performs, and even how clean your indoor air is. At Hilux Cleaning Services, we help Melbourne homeowners keep their ductwork in peak condition. But before ducts are cleaned, they have to be chosen right.

In this guide, we’ll explore the different types of ducts available for air conditioning systems, what factors you need to consider, and how to maintain them for long-term efficiency.

Why Duct Selection Matters

The ducts you choose impact:

  • Airflow efficiency
  • Cooling performance
  • Indoor air quality
  • Energy consumption
  • Noise levels

Well-chosen ductwork ensures that your air conditioning system doesn’t have to overwork, saving you money and stress down the line.

Types of Air Conditioning Ducts

1. Sheet Metal Ducts

These are the most common and durable type of ducts.

  • Material: Galvanised steel or aluminium
  • Pros: Non-porous (won’t trap dust and allergens), long lifespan
  • Cons: Can be prone to rust if insulation is poor

2. Flexible Ducts

Ideal for tight or awkward spaces.

  • Material: Wire coil covered in durable plastic
  • Pros: Easy to install, cost-effective
  • Cons: More susceptible to damage and air leaks if not properly installed

3. Fibreglass Duct Board

Often used for quieter air delivery.

  • Material: Panels of fibreglass
  • Pros: Built-in insulation, reduces noise
  • Cons: Can trap dust and promote mould if not maintained properly

4. Fabric Ducts (Textile Air Dispersion)

Best for commercial or large open areas.

  • Material: Fabric
  • Pros: Even air distribution, lightweight
  • Cons: More suited to large spaces than homes

Factors to Consider When Choosing Air Conditioning Ducts

– Size and Layout of Your Home

Larger or multi-level homes may benefit from a mix of sheet metal and flexible ducts. A professional installer will calculate the right duct size using Manual D (a duct design standard).

– Energy Efficiency

Look for ductwork that reduces air leakage and is appropriately sealed. Poor duct selection can cause up to 30% of air loss.

– Insulation Needs

Insulated ducts are crucial for maintaining temperature and preventing condensation. Fibreglass-lined or double-wrapped ducts help maintain cool air.

– Air Quality Requirements

If you suffer from allergies or asthma, avoid porous duct materials that can harbour allergens.

– Noise Levels

To minimise noise, fibreglass duct board or insulated sheet metal ducts are ideal.

– Budget

While flexible ducts are cheaper to install, they might cost more in the long term due to higher maintenance and lower efficiency.

Maintaining Your Ducts for Optimal Performance

Regardless of which ducts you install, maintenance is essential. This is where Hilux Cleaning Services comes in.

Key Maintenance Tips:

  • Schedule professional duct cleaning every 2-3 years
  • Inspect for leaks or damage regularly
  • Change air filters every 2-3 months
  • Seal and insulate ducts properly

Dirty or clogged ducts can reduce airflow, increase energy bills, and lower air quality. Regular cleaning ensures your air conditioning runs smoothly.

When to Replace Your Ductwork

Over time, even the best duct systems can deteriorate. You should consider replacing your ducts if:

  • They are over 15-20 years old
  • You notice mould growth inside the ducts
  • There are excessive air leaks
  • Your cooling bills have increased without explanation

FAQs About Air Conditioning Ducts

What is the best duct type for home AC systems?

Sheet metal ducts are often preferred due to durability and non-porous design.

Are flexible ducts bad?

Not at all. They are ideal for tight spaces, but must be installed correctly to avoid air loss.

How long do AC ducts last?

Around 15 to 25 years with proper maintenance.

How often should I clean my AC ducts?

Every 2-3 years or more frequently if you have allergies, pets, or smoke indoors.

Can dirty ducts affect AC performance?

Yes. They reduce airflow, lower efficiency, and worsen indoor air quality.

Final Thoughts

Choosing the right ducts for air conditioning is as important as selecting the AC unit itself. From performance to health and energy efficiency, the impact is huge. For Melbourne homeowners, having properly installed and regularly cleaned ducts ensures your comfort and well-being.

If your ducts need cleaning or inspection, reach out to the experts at Hilux Cleaning Services. We’re here to help keep your AC system efficient and your indoor air fresh year-round.