Replacing Gas Ducted Heating: Essential Tips for Melbourne 2026

If your gas ducted heater has reached an advanced age—around 15, 20, or even 25 years—you’ve probably noticed some significant changes in its performance. You might observe that it takes longer to warm your home. You may also have realised that your gas bills have risen, despite no changes in your usage habits. Additionally, you may have heard news about Victoria moving away from gas systems, leaving you questioning how this transition impacts your situation and what options are available to you.

You are certainly not alone in facing these challenges. Numerous homeowners in Melbourne are grappling with similar decisions, weighing whether to repair their current systems, replace them with another gas heater, or make the switch to electric heating. With the plethora of information available, it can be confusing; thus, it’s crucial to clarify the current situation and what your options are moving forward.

Key Drivers Behind the Rising Need for Gas Ducted System Replacements

Several critical factors are converging right now that you should consider.

To begin with, many gas ducted heaters installed during the late 1990s and early 2000s are approaching the end of their expected operational lifespan. These units typically last between 15 to 20 years, and many have already exceeded that limit. As these systems age, sourcing replacement parts becomes increasingly difficult, their efficiency declines, and ultimately, it often becomes more economical to replace them rather than continue with repairs.

Furthermore, Victoria is actively encouraging electrification of heating systems. Starting in January 2024, the state government will prohibit gas connections in new homes. Although this does not immediately require the removal of your existing gas system, it signals a strong trend towards electrification. Incentives and rebates are increasingly favouring electric systems, and the costs associated with maintaining the gas network are on the rise, indicating that your gas bills will likely continue to escalate.

Moreover, and most importantly, the technology behind reverse cycle systems has undergone significant advancements. A decade ago, ducted reverse cycle systems in Melbourne were often met with skepticism due to older models’ struggles in extreme cold. Thankfully, this perception has shifted; modern systems now efficiently tackle the cold of Melbourne winters without any issues.

Exploring Your Options: Weighing the Pros and Cons

When your gas ducted heater starts to malfunction, you generally have three main options to consider.

1. Repairing 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 repair it. This could cost a few hundred dollars and potentially extend the lifespan of your unit by several years. However, if you discover a cracked heat exchanger (which is a serious safety concern, not merely a comfort issue) or if your unit has surpassed the 20-year mark, investing in repairs could lead to more complications down the line. It is essential to be honest about the true condition and remaining lifespan of your system.

2. Purchasing a New Gas Ducted Heating Unit

This remains a viable option for many homeowners. Existing gas connections can continue to operate—there is no immediate requirement to switch to electric. A new gas ducted heater will typically provide better efficiency than your older model, and if your current ductwork is in good condition, you might be able to reuse it, which can help keep costs manageable. Nevertheless, consider that you are investing in a system reliant on a fuel source that Victoria is moving away from. Gas prices are unlikely to drop, and potential buyers will increasingly factor in running costs when you eventually decide to sell your home. While this option may not be wrong for everyone, it’s important to approach the decision with a clear understanding of the implications involved.

3. Transitioning to Ducted Reverse Cycle Electric Heating

This option is becoming the go-to choice for most homeowners by 2026, and for good reason. A ducted reverse cycle system provides both heating and cooling from a single unit. This means you can reduce your reliance on gas (or at least minimise your gas usage for heating), decrease your running 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 typically higher than a straightforward gas replacement, especially if your existing ductwork requires modifications or replacement. However, when you consider the rebates, decreased ongoing costs, and the dual functionality of heating and cooling, the overall financial outlook usually becomes favourable over a period of 5 to 7 years.

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

Many people desire clarity about what to expect during the replacement process, so here’s a general 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 mistake of providing quotes based on rough estimates rather than thorough load calculations. If someone quotes without conducting proper measurements, consider that a warning sign.
• Detailed Quote and Planning: You will receive a comprehensive written quote that covers the unit, any necessary modifications to the ductwork, electrical work, and the process of gas disconnection. This approach ensures that no surprises arise on the day of installation.
• Installation Day(s): For a straightforward gas-to-gas swap where the existing ductwork is reusable, the process usually takes one day. If you are switching to a full reverse cycle system with new ductwork, anticipate the installation to last two to three days. Be aware that you will not have heating during this period, so it’s wise to avoid scheduling it during the coldest months of July.
• System Commissioning: After installation, the system will undergo testing, zoning will be balanced, and you will be instructed on how to operate the system effectively. While this may seem elementary, many homeowners fail to receive proper guidance on how to use their new system, which can lead to confusion later on.

Estimating Replacement Costs: A Practical Breakdown of Expenses

Cost estimates can vary significantly based on your home’s size, the extent of ductwork modifications needed, and the specific system you opt for. 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 rise 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 challenging 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, significant savings can be achieved.
• VEU rebates can lower 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 why.

These figures serve as general guidelines and may not reflect your unique situation. Each house is different. If you desire a precise estimate for your home, don’t 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 first 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 of lead time (including unit ordering and scheduling), followed by two to three days on-site for installation.
• Peak season (May–July): During these months, the process may take longer as many homeowners in Melbourne suddenly realise their heating systems are malfunctioning. If you are reading this in autumn, now is an ideal time to arrange your installation.

Critical Questions to Discuss with Your Installer

Not all installers are equal, and in this industry, the quality of installation is as vital 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 a precise calculation. Systems that are undersized will fail to 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.
• What brand and model are you quoting? It’s crucial to know exactly what you are getting, rather than a vague reference like “a 14kW system.”
• What’s the warranty—on the unit and your installation work? It is essential to differentiate 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 shouldn’t have to chase paperwork; your installer should handle that for you.

Addressing Your Common Concerns: Frequently Asked Questions

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

No, there is no law 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 vital to consider that Victoria’s energy policy is shifting towards electrification, so think about the long-term implications rather than focusing solely on the current 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 desired, 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 designed to operate efficiently even in temperatures significantly lower than those typically experienced in Melbourne. The outdated belief that heat pumps struggle in cold weather stems from older models that lacked capability. Current systems perform well—even during those brisk 2°C mornings in July.

How can I determine if my ductwork is reusable?

A qualified installer must physically inspect your ductwork. They will assess size, condition (ensuring there are no significant leaks, tears, or collapsed sections), and whether the layout suits the new system. Metal ductwork in good condition can often be reused, while older flexible duct that has deteriorated usually requires replacement.

What happens to my old gas heater?

Your installer will handle the removal and disposal of your old unit. A licensed gas fitter will properly cap off the gas supply to the unit, 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 decrease your running costs. The exact savings will depend on your home, usage patterns, and electricity rates, but most homeowners notice a marked reduction.

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If you have an aging gas ducted system and are uncertain about your next steps, reach out to Beyond Heating and Cooling. They will assess 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.