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How long does an HVAC System last?

HVAC systems are essential for maintaining comfortable indoor temperatures and air quality in residential and commercial buildings considering the ever-changing weather of Melbourne. However, like any other mechanical system, HVAC systems have a limited lifespan. The longevity of an HVAC system will depend on its quality and the care it receives throughout its lifetime. HVAC systems that receive regular inspections and maintenance tend to last longer than those that don’t. A poorly maintained system is prone to more frequent breakdowns, so regular maintenance is the key to keeping your system in working order. Generally, HVAC systems can last between 10 to 25 years, with proper care and maintenance.

The lifespan of an HVAC system can be extended through regular maintenance and repairs. Regular maintenance includes cleaning or replacing air filters, checking refrigerant levels, lubricating moving parts, and inspecting electrical connections. Neglecting regular maintenance can lead to reduced efficiency, increased energy bills, and premature system failure. Additionally, prompt repairs of minor issues can prevent them from escalating into major problems that require costly replacements.

Factors That Impact the Lifespan of an HVAC System

One of the primary factors that impact the lifespan of an HVAC system is the quality of installation. When an HVAC system is installed correctly, it can last for many years. However, if the installation is rushed or done improperly, it can lead to problems down the road. For instance, if the ductwork is not installed correctly, it can cause leaks and reduce the efficiency of the system. Similarly, if the refrigerant lines are not properly insulated, they can cause condensation and corrosion, which can lead to costly repairs or even replacement.

Another factor that affects the lifespan of an HVAC system is maintenance. Regular maintenance is crucial for ensuring that an HVAC system runs efficiently and lasts as long as possible. Neglecting maintenance tasks such as cleaning or changing air filters, cleaning coils, and checking refrigerant levels can cause damage to the system over time. This damage can cause parts to wear out faster than they should and even lead to a complete breakdown of the system.

Finally, environmental factors can also impact the lifespan of an HVAC system. Extreme temperatures, humidity levels, and exposure to outdoor elements such as rain and snow can all take a toll on an HVAC system over time. Additionally, poor air quality due to pollution or other factors can cause damage to components within the system. By addressing these environmental factors through proper insulation and ventilation techniques, homeowners can help extend the lifespan of their HVAC systems.

Average Lifespan of an HVAC System

The average lifespan of an HVAC system is around 15-20 years. However, this can vary depending on factors such as maintenance, usage, and location. Proper maintenance can prolong the life of an HVAC system by preventing breakdowns and ensuring that it operates efficiently. Regularly changing air filters, cleaning coils, and checking refrigerant levels are some of the maintenance tasks that can help extend the lifespan of an HVAC system.

Usage also plays a significant role in how long an HVAC system lasts. Units that are used more frequently or in extreme temperatures may have a shorter lifespan than those used less frequently or in milder climates. Additionally, the location of the unit can impact its lifespan. For example, units installed in coastal areas may experience more wear and tear due to saltwater exposure, while those installed in areas with high levels of pollution may experience damage from airborne contaminants.

Finally, advancements in technology can also impact the lifespan of an HVAC system. Older units may not be as energy-efficient as newer models, which can lead to increased wear and tear over time. Additionally, newer units may be made with more durable materials or have features such as variable-speed motors that help reduce stress on the unit. Overall, while the average lifespan of an HVAC system is around 15-20 years, there are many factors that can impact how long a unit lasts.

Signs of an Aging HVAC System

Increased Energy Bills

One of the signs of an ageing HVAC system is reduced efficiency. As HVAC systems age, they tend to become less efficient in their operation. This is because the components of the system start to wear out and may not be able to perform at the same level as they did when they were new. Reduced efficiency can result in higher energy bills and a decrease in comfort levels.

Increased Number of Repairs

Another sign of an ageing HVAC system is increased repair costs. As HVAC systems age, they are more likely to break down and require repairs. This is because the components of the system are subjected to wear and tear over time. Additionally, older systems may require more frequent repairs as they become less efficient, which can lead to increased maintenance costs.

Noisy & Smelly

An ageing HVAC system may produce strange noises or odours. This is often a sign that the system is struggling to operate efficiently or that there may be a problem with one of its components. Strange noises or odours can be a sign that it’s time to replace your HVAC system or seek professional help to diagnose and fix any issues.

Poor Air Quality

If you see a lot of dust floating around in your home or if you or your loved ones have recently started observing allergies or respiratory ailments, your HVAC System may be the reason behind that. An ageing or broken-down HVAC System can cause poor air quality in your home and to avoid that, you should consult with the expert technicians at DGB Refrigeration Heating & Cooling.

Discomfort in your Home

If your HVAC unit has been running non-stop and it still cannot achieve your desired temperature in your home, this is a symptom of an issue with the system, possibly an ageing HVAC system.

Tips for Extending the Lifespan of an HVAC System

Regular Maintenance

One of the best ways to extend the lifespan of an HVAC system is to ensure that it receives regular maintenance. HVAC systems should be serviced at least once a year, preferably before the start of the heating or cooling season. During a maintenance service, the technician will inspect and clean all components of the system, replace worn parts, and make necessary adjustments. This will help keep the system running efficiently and prevent breakdowns.

Proper Usage

Another important factor in extending the lifespan of an HVAC system is proper usage. This includes using the system only when necessary, setting the thermostat to an appropriate temperature, and keeping doors and windows closed while the system is running. It’s also important to change air filters regularly, as dirty filters can cause the system to work harder than it needs to.

Upgrade when Necessary

Finally, it’s important to upgrade your HVAC system when it reaches the end of its lifespan. Most HVAC systems have a lifespan of 10-15 years, so if your system is approaching this age, it may be time to consider a replacement. Upgrading to a newer, more efficient system can save you money on energy bills and reduce your carbon footprint. Additionally, newer systems are often equipped with advanced features like programmable thermostats and zoning systems that can further improve efficiency and comfort.

When to Replace an HVAC System?

One of the primary factors to consider when determining whether to replace an HVAC system is its age. Most HVAC systems are designed to last between 10 and 15 years, although some may last longer with proper maintenance. If your system is approaching or exceeding this age range, it may be time to consider a replacement. Older systems are more likely to break down and require frequent repairs, which can be costly and frustrating.

Another consideration when deciding whether to replace an HVAC system is its energy efficiency. Newer systems are generally more efficient than older models, which means they use less energy to heat or cool your home. This can result in significant savings on your energy bills over time, which can help offset the cost of a new system. Additionally, many newer systems feature advanced technologies that allow for more precise temperature control and improved air quality.


Finally, if you notice that your HVAC system is no longer keeping your home comfortable or is making unusual noises or emitting strange odours, it may be time for a replacement. These issues can be signs of serious problems with your system that may not be fixable with simple repairs. In these cases, replacing the entire system may be the best option to ensure that your home stays comfortable and safe. Here at DGB Refrigeration Heating & Cooling, we can provide you with a quote for the supply & installation of a brand-new HVAC unit that will keep you comfortable in your home. Get in touch with us today by dialling 03 7038 6918 and let us take the burden off of your shoulders.


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