For ducted reverse cycle air conditioning systems, ductwork is a crucial component that ensures conditioned air is distributed efficiently throughout your home or business. Think of ductwork as the “air highways” that deliver cooled or heated air from the central unit to each room.

Unfortunately, many homeowners underestimate the importance of maintaining or replacing old ductwork. Over time, ducts can develop leaks, accumulate dust, or lose insulation. These issues reduce airflow, waste energy, and compromise indoor comfort. Plus, modern ducted systems now require ductwork that meets updated insulation standards for maximum efficiency.

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Why Replacing Your Ductwork Is Essential

At Melbourne Aircon Specialist, one of the most common questions we receive is:
“Should I replace my ductwork when installing a new air conditioner?”

The answer is YES—especially if you’re upgrading from an old gas ducted heating system and want to claim the Victorian Energy Upgrades (VEU) rebate. Here’s why:

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1. Claim the VEU Rebate

To be eligible for the VEU rebate, your ducted reverse cycle air conditioning system must include ductwork insulation with a minimum R-value of 1.5. Older gas ducted systems often have insulation below R-1.0, which means they are less effective at maintaining air temperature. Properly insulated ducts reduce heat loss and improve energy efficiency.

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2. Prevent Leaks and Save Energy

Older ductwork often has leaks, cracks, or loose seals, which allow conditioned air to escape before it reaches your rooms. Replacing ductwork ensures all connections are secure and airtight, helping your system run efficiently while lowering energy costs.

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3. Improve Airflow and System Performance

Ducts designed for gas heating often don’t meet the airflow needs of modern reverse cycle systems. Replacing them ensures proper airflow and system performance, keeping every room evenly comfortable without straining your AC unit.

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Signs You Need Ductwork Replacement

Watch out for these indicators:

• Uneven heating or cooling across rooms
• Dust blowing from vents or poor indoor air quality
• High energy bills despite no increase in usage
• Rust, holes, or visible duct damage
• Weak airflow from vents
• Ductwork over 20 years old

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Factors Affecting Ductwork Replacement Costs

The cost of duct replacement in Melbourne depends on:

• Home size and layout – Larger or complex layouts require more materials and labour
• Duct material – Modern insulated ducts with R-1.5 insulation are standard for efficiency
• Full vs partial replacement – Full replacements cost more but ensure long-term results
• Insulation upgrades – Upgrading insulation pays off in reduced running costs
• Compliance requirements – Meeting current building codes may add extra work
• Number of vents – More vents mean more ducting required

At Melbourne Aircon Specialist, we simplify the process by providing all-inclusive quotes that cover materials, labour, and compliance with the latest standards.

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Our Expertise

We specialise in installing ducted systems under the VEU rebate program, ensuring your ductwork and air conditioning meet energy efficiency requirements. Our team:

• Conducts detailed inspections of your existing ducts
• Recommends replacements tailored to your property’s needs
• Uses only high-quality, BCA-compliant materials
• Provides expert installation for year-round comfort

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Final Thoughts

If you’re replacing an old gas ducted heating system with a new reverse cycle unit, ductwork replacement is a must. Older ducts simply weren’t designed for today’s high-efficiency systems and insulation standards.

Even if your ducts appear in good condition, upgrading ensures proper sealing, insulation, and performance—helping you save on bills and improve indoor comfort.

Book your free assessment today with Melbourne Aircon Specialist and let our experts upgrade your ductwork and system for a smarter, more efficient home.

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FAQs

1. Should I replace ductwork when replacing my AC?
Yes, especially to meet VEU rebate requirements and improve efficiency.

2. Can I reuse old gas heating ducts for reverse cycle air conditioning?
No. Gas heating ducts don’t meet insulation and airflow standards required for reverse cycle systems.

3. Should ducts over 20 years old be replaced?
Absolutely. Older ducts usually have leaks, poor insulation, and cannot support modern systems efficiently.