Multi Head Split System vs Ducted Air Conditioning: The Best Choice for 2025

What is a Multi-Head Split System Air Conditioner?

A multi-head split system provides flexibility by connecting one outdoor unit to multiple indoor units, with independent operational control for each space. This solution offers targeted cooling and heating for areas with different room sizes or usage patterns.

With a multi head split system you can connect up to five indoor units with just one compressor unit located outside. This setup is ideal for apartments, homes on small blocks, or with limited space to install multiple single split system air conditioners.

You can choose from different types of sleek indoor units (wall-mounted, cassette or floor console) for a tailored solution for every room.

What is a Ducted Air Conditioner?

A ducted air conditioner is a whole-house solution that uses concealed ducts and vents to distribute conditioned air evenly throughout your home. As a centralised system, it’s ideal for maintaining uniform temperatures across large spaces or multi-room homes.

It’s quiet and unobtrusive and can be tailored to your roof space and different home layouts. Advanced features include thermostat controls and zoning options, so you don’t unnecessarily heat or cool rooms not in use.

The Differences Between Ducted and Multi Split System Air Conditioning

Multi Split Systems vs Ducted Further Explored

Heating

For both systems, it’s worth noting that modern air conditioning units provide year-round comfort by offering both heating and cooling functions. A multi-head split system is ideal for selectively heating smaller rooms, such as bedrooms or offices, while ducted systems ensure consistent warmth throughout larger homes, especially in Melbourne’s colder winters.

Ventilation and Air Flow

Proper airflow distribution maximises comfort in your home. While multi-head split systems manage airflow on a per-room basis (each indoor unit has its own fan and controls), ducted systems distribute conditioned air uniformly through ducts leading to ceiling or wall vents. This ensures even airflow in open spaces or large, multi-room areas.

Aesthetics

A significant factor for homeowners is how the system integrates with the home design. Ducted systems are the most discreet option, as the main components remain hidden in the ceiling or roof, with only small vents/grilles visible. Multi-head split systems, while practical, feature visible indoor units that may impact the overall look of the space. There are options however, such as wall mounted or floor mounted units, and ceiling cassette style units for larger areas.

Room Size and Zones

Multi-split systems offer tailored solutions for homes with varying room sizes. For example, smaller rooms (such as a study or a child’s bedroom) can use lower-capacity indoor units, while larger spaces (like living rooms) can use higher-capacity ones. On the other hand, ducted systems with zoning features allow entire floors or specific rooms to be cooled or heated as necessary, increasing efficiency without sacrificing comfort.

Energy Efficiency

Energy efficiency is a top consideration for Melbourne homeowners aiming to reduce electricity bills. While ducted systems can be less efficient when heating or cooling the entire home unnecessarily, systems with zoning allow energy conservation by cooling or heating only occupied rooms. Multi-split systems, however, inherently offer efficiency due to individual room control—perfect for targeted use during Melbourne summers or winters.

Maintenance

Maintenance differs for each system. Ducted air conditioning systems require regular professional cleaning of ducts and vents to maintain airflow and prevent dust buildup, essential for reducing allergens in the home. Multi-split systems need individual cleaning of air filters for each indoor unit, which can be more frequent but less complex to handle.

Compressor and Durability

Both systems rely on an outdoor compressor for overall operation. Multi-split systems share a single outdoor compressor that serves multiple indoor units, which may reduce noise and space while maintaining durability. Ducted systems also depend on robust compressors, beneficial for large-scale operations. Both need regular servicing, and given they both use one outdoor unit, if something fails, the whole system is likely to go down with both options.

Temperature Control and Zoning

Both air conditioning systems offer temperature zoning options, but they approach it differently. Multi-split systems are ideal for precise, room-level temperature control, while ducted systems allow broader zoning—great for managing floor-wide temperatures in multi-level homes. Zoning flexibility ensures both systems minimise energy waste while maximising comfort across various areas of the home.

Installation and Running Costs

Initial installation costs differ significantly between the two systems. Ducted systems typically involve higher upfront costs due to the need for ductwork and ceiling modifications. Still, they may be more cost-effective for cooling/heating larger homes in Melbourne’s varying weather. Multi-head split systems usually have lower initial costs, though adding more indoor units for multiple rooms can increase expenses over time. Either way, we offer flexible, interest-free financing to make your chosen system more affordable and fit your budget.

Studies have indeed shown that multi-head split systems can reduce energy consumption by up to 30% compared to traditional ducted systems

• Zoning capabilities: Multi-head split systems allow you to cool or heat only the rooms in use, rather than conditioning the entire house. This targeted approach reduces energy waste in unoccupied areas.
• Inverter technology: Modern multi-head split systems often use inverter technology, which continuously adjusts the compressor speed based on cooling demand. This results in more precise temperature control and improved energy efficiency.
• Minimal ductwork: Unlike ducted systems, multi-head split systems don’t require extensive ductwork, which can lead to energy losses due to leaks and insufficient insulation.
• Individual room control: Each indoor unit can be controlled independently, allowing for customised comfort settings in different areas of the home.

These features combine to make multi-head split systems a more energy-efficient option for many households, especially when compared to ducted air con.

Smart Technology and Compatibility

Many modern systems integrate smartphones or mobile apps for remote control. With a Wi-Fi connection, you can pre-cool or pre-heat rooms in your home for added convenience. Voice assistants, like Google Assistant or Amazon Alexa, are also increasingly compatible with both systems, allowing hands-free operation. This makes managing zoning or adjusting temperatures easy and efficient.

Environment and Energy Conservation

Most leading brands of air conditioners use R32 refrigerants, a next-generation refrigerant designed to provide efficient cooling and heating performance while being more environmentally friendly than older refrigerants like R410A. With a lower Global Warming Potential (GWP)—approximately one-third of R410A—R32 helps reduce carbon emissions and lessen the overall impact of climate change. Additionally, it has higher energy efficiency, requiring less refrigerant to achieve the same cooling capacity, which translates into lower energy consumption and reduced electricity costs. R32 is also easier to recycle and complies with stricter environmental regulations, making it a sustainable choice for eco-conscious homeowners looking to minimise their carbon footprint.

Multi Systems vs Ducted Systems: Which Air Conditioning is Best for You?

Choose a ducted system if you:

• Want a sleek, hidden design with no visible indoor units.
• Prefer a centralised system that offers consistent temperature across the home.
• Have a larger home or an open-plan living space that benefits from even and widespread air distribution.

Choose a multi-head split system if you:

• Need targeted temperature control for specific rooms.
• Have a small to medium-sized home or property where only certain areas need cooling or heating.
• Want a system with lower installation costs and flexibility in placing indoor units.

Ultimately, your choice will depend on a combination of factors: your home design, personal preferences for aesthetics, comfort requirements, and budget. Consulting the air conditioning specialists at ExtrordinAir can help evaluate your home’s layout and ensure you choose the system that best fits your needs!