Replacing Gas Ducted Heating: Essential Tips for Melbourne 2026

If your gas ducted heater is ageing — typically around 15, 20, or even 25 years old — you’ve probably started to notice some changes in its performance. You may observe that it takes longer to warm your home efficiently. Additionally, your gas bills might have seen an unexpected increase, despite no changes in your consumption habits. Furthermore, you may have heard that Victoria is moving away from gas systems, leading to uncertainty about the implications for your heating situation.

Rest assured, you are not alone in facing this situation. A considerable number of homeowners in Melbourne are grappling with similar choices, deliberating on whether to fix their current systems, invest in another gas heater, or switch to electric heating. With a plethora of information circulating, it is crucial to clarify the current landscape and explore your options moving forward.

Understanding the Factors Driving Increased Gas Ducted System Replacements

Numerous elements are converging to influence your heating decisions at this moment.

To begin with, a substantial number of gas ducted heaters that were installed during the early 2000s and even in the 1990s are nearing the end of their operational lifespan. These units were originally designed to last between 15 to 20 years, and many have exceeded that expected duration. As they continue to age, sourcing replacement parts becomes increasingly challenging, their efficiency diminishes, and it typically becomes more financially viable to replace them rather than persist with costly repairs.

Moreover, Victoria is actively endorsing electrification of heating systems. Beginning January 2024, the state government will prohibit gas connections in new homes. Although this does not require immediate removal of your existing gas system, it clearly indicates a shift in policy direction. Current incentives and rebates are increasingly favouring electric systems, while the maintenance costs of the gas network continue to rise, suggesting that your gas bills may keep increasing.

Lastly, and perhaps most significantly, the technology behind reverse cycle systems has seen remarkable advancements. A decade ago, ducted reverse cycle systems in Melbourne often faced scepticism as older models struggled to perform adequately in severe cold. Fortunately, this perception has evolved; modern systems now effectively manage the chill of Melbourne winters without any significant issues.

Assessing Your Options: Weighing the Pros and Cons

When your gas ducted heater starts to show signs of failure, you generally have three primary options to consider.

1. Repair Your Current Heating System

If your heating system is less than 15 years old and the issue is relatively minor—such as a malfunctioning fan motor, ignition module, or thermostat—it may be worthwhile to pursue repairs. This could incur costs of a few hundred dollars and potentially extend the life of your unit for several more years. However, if you encounter a cracked heat exchanger (which poses safety risks, not just comfort concerns) or if your unit has surpassed the 20-year mark, investing in repairs may lead to further complications down the line. It is essential to be honest with yourself regarding your system's true condition and its remaining lifespan.

2. Invest in a New Gas Ducted Heating Unit

This option remains viable. Existing gas connections can continue to operate as there is no requirement for an immediate transition to electric heating. A new gas ducted heater will generally provide better efficiency than your older model, and if your current ductwork is in satisfactory condition, you might reuse it, which could help keep costs manageable. However, be conscious that you are investing in a system that relies on a fuel source that Victoria is gradually stepping away from. Gas prices are unlikely to decrease, and potential homebuyers will increasingly consider operational costs when you eventually sell. While this choice may suit some, approach the decision with full awareness of its implications.

3. Transition to Ducted Reverse Cycle Electric Heating

This option is where most homeowners are likely headed by 2026, and there are compelling reasons for this trend. A ducted reverse cycle system provides both heating and cooling from a single unit. This allows you to move away from gas (or at least decrease your reliance on gas for heating), reduce your ongoing costs, and qualify for Victorian Energy Upgrades (VEU) rebates, which can significantly offset your installation expenses. The downside is that the initial investment for this system is generally higher than simply replacing a gas unit, especially if your existing ductwork requires alteration or replacement. Nonetheless, when you factor in the rebates, lower ongoing costs, and the dual functionality of heating and cooling, the overall financial picture usually becomes favourable over a period of 5 to 7 years.

Navigating the Replacement Process: A Detailed Step-by-Step Overview

Many homeowners seek clarity regarding what to expect during the replacement process. Here is a detailed overview.

• Initial Assessment: A qualified professional will visit your home to evaluate your current system, inspect the ductwork, measure the space, and discuss your specific needs. Many installers make the error of providing quotes based on rough estimates rather than precise load calculations. If someone provides a quote without taking accurate measurements, consider that a warning sign.
• Comprehensive Quote and Planning: You will receive a thorough written quote that encompasses the unit, any necessary modifications to the ductwork, electrical work, and the process of gas disconnection. This step ensures that no surprises arise on installation day.
• Installation Day(s): For a straightforward gas-to-gas swap where the existing ductwork is reusable, the entire process typically takes one day. If you are transitioning to a complete reverse cycle system with new ductwork, expect the installation to last two to three days. Keep in mind that you will not have heating during this period, so it is wise to avoid scheduling it during the coldest months of July.
• System Commissioning: Following installation, the system will undergo testing, zoning will be balanced, and you will receive guidance on how to operate the system effectively. While this may seem straightforward, many homeowners fail to receive appropriate instructions on how to utilise their new system, potentially leading to confusion later on.

Determining Replacement Costs: A Realistic Financial Overview

Cost estimates can vary considerably based on your home's size, the degree of ductwork modifications required, and the specific system you select. However, here’s a realistic price range for Melbourne in 2026.

• Gas ducted heater replacement (reusing existing ducts): Expect prices to start around $4,500 and can reach up to $7,000 for installation, depending on the unit size and brand.
• Ducted reverse cycle (full installation with new ductwork): Prices generally range from $10,000 to $18,000 or more for an average home in Melbourne. Larger homes, multiple zones, or difficult roof spaces will increase costs.
• Ducted reverse cycle (using existing ductwork where feasible): This can cost between $7,500 and $13,000. Not every gas duct layout is suitable for reuse, but when it is, you can achieve significant savings.
• VEU rebates can reduce costs by anywhere from $1,000 to $3,000 or more, depending on your system and individual circumstances. Your installer should assist with the rebate paperwork; if they cannot, it's worth questioning their capabilities.

These figures serve as general guidelines and may not reflect your unique situation. Every house is different. If you desire a precise estimate tailored to your home, do not hesitate to contact us for a quote — Beyond Heating and Cooling provides this service free of charge.

Understanding the Project Timeline: How Long Will the Entire Process Take?

From the initial call to when your system is fully operational:

• Simple gas swap: Typically completed within a week or two after you accept the quote, with a one-day installation timeframe.
• Full reverse cycle changeover: Usually requires two to four weeks for lead time (including unit ordering and scheduling), followed by two to three days on-site for installation.
• Peak season (May–July): During these months, everything may take longer as many homeowners in Melbourne suddenly realise their heating systems are failing. If you are reading this in autumn, now is an ideal time to arrange your installation.

Key Questions to Ask Your Installer: Ensuring Quality Service

Not all installers are equal, and in this field, the quality of installation is as crucial as the equipment used. Here are some essential questions you should consider asking:

• Have you conducted a heat load calculation for my home? This should not be a guess but an actual calculation. Systems that are undersized won't heat your home effectively, while oversized systems waste energy by cycling on and off.
• Can I reuse my existing ductwork? This can vary. A reputable installer will provide a clear answer based on your specific situation and requirements.
• What brand and model are you quoting? It is vital to know precisely what you are getting, rather than receiving a vague reference like “a 14kW system.”
• What’s the warranty — on the unit and your installation work? It's crucial to distinguish between the manufacturer's warranty and the warranty provided by the installer.
• Are you licensed to perform gas disconnections? If you are transitioning from gas, a licensed gas fitter must correctly disconnect your old unit. Not every HVAC company can perform this task — Beyond Heating and Cooling can, as our team holds gas fitting licenses in addition to HVAC qualifications.
• Will you manage the VEU rebate? You should not have to chase after paperwork; your installer should handle that for you.

Addressing Common Concerns: Your Frequently Asked Questions

Do I need to replace my gas heater with an electric one?

No, there is no legal requirement mandating the removal of an existing gas ducted heater. You have the option to repair it or replace it with another gas unit. However, it is important to consider that Victoria’s energy policy is shifting towards electrification, so think about the long-term implications rather than just the present situation.

Can I maintain my gas cooktop if I switch my heating to electric?

Absolutely. Transitioning your heating to a reverse cycle system does not affect your gas cooktop, hot water system, or any other appliances. You can gradually electrify your home if you wish, but there is no requirement to convert everything at once.

Is reverse cycle heating sufficient for Melbourne winters?

Yes, modern ducted reverse cycle systems are engineered to operate efficiently even in temperatures significantly lower than those typically experienced in Melbourne. The outdated notion that heat pumps struggle in cold weather originates from older models that lacked the necessary capabilities. Current systems perform exceptionally well, even during those brisk 2°C mornings in July.

How can I determine if my ductwork is reusable?

A qualified installer must conduct a physical inspection of your ductwork. They will evaluate its size, condition (ensuring there are no significant leaks, tears, or collapsed sections), and whether the layout is compatible with the new system. Metal ductwork in good condition can typically be reused, while older flexible duct that has deteriorated often requires replacement.

What happens to my old gas heater?

Your installer will remove and properly dispose of your old unit. A licensed gas fitter will cap off the gas supply to the unit correctly, so you won’t need to arrange this separately.

Will a new system help lower my energy bills?

It should, yes. Transitioning from a 20-year-old gas ducted heater operating at around 60–70% efficiency to a modern reverse cycle system with a Coefficient of Performance (COP) of 4 or better will significantly reduce your running costs. The exact savings depend on your home, usage patterns, and electricity rates, but most homeowners observe a noticeable decrease.

If you have an ageing gas ducted system and are uncertain about your next steps, reach out to Beyond Heating and Cooling. They will evaluate your current setup and provide honest advice on whether it’s worth repairing or replacing — and what the best replacement option is for your home. No pressure, no obligation, just straightforward guidance on what makes the most sense for you.