Replacing Gas Ducted Heating: Key Tips for Melbourne 2026

If your gas ducted heater is reaching an advanced age — we’re talking 15, 20, or sometimes even 25 years old — you’ve likely begun to notice some changes. You may find that it takes longer to warm your home. Perhaps your gas bills have increased without any alteration to your usage habits. Or you might have heard that Victoria is transitioning away from gas systems, leaving you wondering what this means for your situation.

You are not alone in this predicament. Many homeowners in Melbourne are facing similar dilemmas, trying to decide whether to repair their existing systems, replace them with another gas heater, or switch to electric heating. There’s a lot of information circulating, so let’s clarify what’s actually happening and what your options are moving forward.

Discovering the Reasons Behind Increased Gas Ducted System Replacements

Several factors are converging at this moment.

Firstly, a significant number of gas ducted heaters installed during the early 2000s (and even the 1990s) are reaching the end of their operational lifespan. These units were designed to last between 15 to 20 years, and many have surpassed that threshold. As they age, replacement parts become harder to source, their efficiency declines, and eventually, it becomes more cost-effective to replace them rather than continue with repairs.

Secondly, Victoria is actively promoting electrification. Starting January 2024, the state government will prohibit gas connections in new homes. While this does not necessitate immediate removal of your existing gas system, it signals a clear direction. Incentives and rebates are now favouring electric systems, and the gas network is becoming increasingly expensive to maintain, indicating that your gas bills will likely continue to rise.

Thirdly, and most importantly, the technology behind reverse cycle systems has advanced significantly. A decade ago, a ducted reverse cycle system in Melbourne was often viewed with skepticism, as older models struggled in severe cold. Fortunately, this perception has changed; modern systems now efficiently handle the chill of Melbourne winters without issues.

Evaluating Your Choices: Advantages and Disadvantages

When your gas ducted heater begins to fail, you typically have three options available to you.

1. Repair Your Existing Heating System

If your heating system is under 15 years old and the problem is relatively minor — such as a faulty fan motor, ignition module, or thermostat — it may be worth repairing. This could cost a few hundred dollars and extend the life of your unit for several more years. However, if you discover a cracked heat exchanger (a safety concern, not just a comfort issue) or if your unit has surpassed the 20-year mark, investing in repairs could lead to further complications down the road. Be honest with yourself regarding your system's true condition and remaining lifespan.

2. Invest in a New Gas Ducted Heating Unit

Yes, this is still a viable option. Existing gas connections are allowed to remain operational — no one is mandating an immediate switch to electric. A new gas ducted heater will typically offer 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. However, keep in mind that you are investing in a system that relies on a fuel source that Victoria is moving away from. Gas prices are unlikely to decrease, and potential buyers will increasingly consider running costs when you eventually sell your home. While this may not be the wrong choice for everyone, approach the decision with full awareness of the implications.

3. Transitioning to Ducted Reverse Cycle Electric Heating

This option is where most homeowners are heading in 2026, and for good reason. A ducted reverse cycle system delivers both heating and cooling from a single unit. This means you can move away from gas (or at least reduce your gas dependence for heating), lower your running costs, and qualify for Victorian Energy Upgrades (VEU) rebates, significantly offsetting your installation expenses. The downside is that the initial investment for this system is generally higher than a straight gas replacement, particularly if your existing ductwork needs alteration or replacement. Nevertheless, when you factor in the rebates, reduced ongoing costs, and the dual functionality of heating and cooling, the numbers usually add up positively over a period of 5 to 7 years.

Understanding the Replacement Procedure: A Comprehensive Step-by-Step Guide

Many people want clarity about what to expect during the replacement process, so here’s a general overview.

• Initial Assessment: A qualified professional visits your home to evaluate your current system, inspect the ductwork, measure the space, and consult with you about your specific needs. Many installers make the mistake of providing quotes based on rough estimates rather than thorough load calculations. If someone quotes without taking 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 ensures 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 typically takes one day. If you are switching to a full reverse cycle system with new ductwork, expect the installation to last two to three days. Be aware that you will not have heating during this period, so it's wise not to schedule 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 down the line.

Estimating Replacement Costs: A Realistic Overview

Cost estimates can vary significantly based on your home’s size, the extent of ductwork modifications required, and the specific system you choose. 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 go 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 challenging roof spaces will push costs higher.
• Ducted reverse cycle (using existing ductwork where possible): This can cost between $7,500 and $13,000. Not every gas duct layout is suitable for reuse, but when it is, it can lead to 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 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.

Project Timeline: How Long Will the Entire Process Take?

From the first call to when your system is 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 realize their heating systems are malfunctioning. If you are reading this in autumn, now is a prime time to arrange your installation.

Essential Inquiries to Make with Your Installer

Not all installers are equal, and in this line of work, the quality of installation is as crucial as the equipment used. Here are some important questions to 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 effectively heat your home, 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 essential 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's vital 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 Common Concerns: Your 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 can choose 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 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 notion 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 typically requires replacement.

What happens to my old gas heater?

Your installer will remove and dispose 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 depend on your home, usage patterns, and electricity rates, but most homeowners notice a marked reduction.

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.