Bulkhead Air Conditioning System vs Split System: Which Is Better for Melbourne Homes?

October 02nd, 2025
Bulkhead Air Conditioning System

Are you relying on a fan to keep you cool in summer? It’s cheaper, but it’s not going to cut it.

But if you’re asking “what type of air conditioning is better for my home in Melbourne?”, it can seem overwhelming with the many models and types on the market.

This article will take stress out of the decision-making process and compare split systems and bulkhead air conditioning.

What is Bulkhead Air Conditioning?

Bulkhead Air Conditioning

Also known as ceiling cassette units, they are a subtype of AC for smaller spaces. Let’s look at some of the reasons to install one:

They’re compact

If you have limited wall or floor space, bulkhead AC options are compact and sleek for spaces like schools, offices, or hospitals.

Older air conditioners are bulky and intrusive, but bulkhead (despite its name!) is almost invisible once installed. Not only is it safer in the long scheme of things, but it also meets Australian building regulations.

They’re efficient

A single outdoor system supports the operation of up to four indoor units that are still energy efficient.

If you’re operating one bulkhead AC indoors, it is operated at a sensible limit for your home or business.

They run quietly

The fans and compressors are very quiet, so this is an awesome feature to have on the side of an air conditioning device.

Since there is no ductwork involved during installation as well, it’s a quieter option.

Independent control

Independent Control

Do you have a number of rooms to cool/heat, but each family member has their own preferences for comfort? A bulkhead AC means you can control each individual unit. With adjustable zones, airflow is directed at specific areas of your home, so you can cool your workspace for remote work or heat your bedroom for sleep.

This feature isn’t found in ducted systems that run with a single unit; the process is similar for multi-head split systems where zoning is involved.

What are some reasons it isn’t right for your cooling needs?

  • > Unlike a wall-mounted or standard ducted system, a bulkhead AC needs to be placed in a specific way.
  • > It’s not always suitable for your property. A bulkhead unit uses a big portion of the ceiling space, so it won’t work if there are building constraints (like studs).
  • > Challenging maintenance and repairs to do yourself, as it’s concealed in the ceiling cavity.

Still can’t decide? Read our blog on: Evaporative Cooling vs. Reverse Cycle: Which is Best For Your Home?

SEZ-M Series
Sez M Series

Experience ultimate comfort with the Mitsubishi Electric SEZ-M Series Bulkhead Air Conditioner, a low static system that combines performance and discreet design. Perfect to cool or heat a single room! Features include:

  • > Capacity range: 2.5 to 7.1 kW
  • > Impressively quiet
  • > Low-profile installation
  • > External static pressure 5 to 50 Pa
  • > Discreet design
  • > R32 refrigerant

Built for quiet, energy-efficient operation, its sleek, compact form ensures powerful climate control without compromising the style of your home or office.

Daikin Bulkhead Air Conditioning
Daikin Bulkhead Air Conditioning
  • > Australian Made
  • > Indoor units are designed and manufactured to Australian standards for reliable performance in harsh summer climates.
  • > Compact Performance
  • > Delivers powerful performance in a compact 450mm-deep unit — ideal for wardrobe or tight-space installations.
  • > Quiet operation
  • > Operates as quietly as 19dBA (low fan speed, 35 Class model) for discreet comfort.
  • > Built-in Condensate Pump
  • > Standard DC pump with a 750mm lift for efficient drainage.
  • > Optional 3D Auto Swing Grille
  • > Motorised vertical and horizontal louvres provide 3D airflow to evenly distribute air throughout the room.
  • > Models: BDG20A09A1 (25 Class), BDG20A15A1 (35–50 Class), BDG20A20A1 (60–71 Class).
  • > Compatible only with BRC1E63 controller.
  • > Optional Auto Clean Air Filter Module
  • > Keeps the internal filter clean by collecting dust into a vacuum port for easy removal.
Internal Filter Clean

What Are Split Systems?

Split Systems

A split system air conditioner is made up of two separate units: one inside your home and one outside. The indoor unit is responsible for blowing warm or cool air directly into the room, while the outdoor unit houses key components like the compressor and condenser.

For Melbourne homes, where you might just want to cool a living area or heat a bedroom during chilly mornings, a split system is a practical (and popular) solution.

How does a split system work?

Indoor unit: Mounted to the wall inside the room, it contains the evaporator coil and a fan to circulate air.

Outdoor unit: Installed outside, this unit includes the compressor, condenser coil, and expansion valve.

Refrigerant cycle: A refrigerant moves between the two units, absorbing heat from indoors, releasing it outside, or reversing the process when heating.

Smart temperature control: Most models come with a remote or app-based control, letting you adjust temperature, fan speed, and more.

There are also different types of split systems: wall-mounted, multi-split and floor-mounted.

MSZ-AP Series
Msz Ap Series

Whether you want to feel refreshingly cool or warm and cosy, the Mitsubishi MSZ-AP series is a great cooling and heating option for single rooms and compact homes.

  • > Capacity range: 2.5 kW – 7.8 kW
  • > Quiet operation
  • > Heating and cooling
  • > Dual barrier coating
  • > Night mode
  • > Weekly timer
  • > Vertical and horizontal vanes
  • > Wi-Fi control

MSZ-EF Series
Msz Ef Series

Blending modern clean lines with elegance and efficiency, the MSZ-EF split system air conditioners deliver exceptional indoor comfort and improved air quality. The AC also complements your home’s interior with a sleek, stylish design.

  • > Capacity range: 2.5 – 5.0 kW
  • > Slim-line in design with 3 colour options
  • > 7-day programmable controller
  • > Quiet 21dB noise level in quiet mode (EF25/35)
  • > Wi-Fi control
  • > Nano platinum filter
  • > R32 refrigerant

Bulkhead vs. Split Systems: How Do They Compare?

When looking at bulkhead systems and split systems, the difference lies in the design of the indoor unit.

A bulkhead air conditioner’s indoor unit is concealed within a wall or ceiling (usually a drop ceiling), making it much less visible. In contrast, a split system’s indoor unit is mounted directly on the wall, fully exposed. In short, the bulkhead is integrated into the building, while the split system isn’t. Here are some similarities!

  • > Their cooling capacity, such as using similar cooling mechanisms like the circulation of refrigerant to absorb heat from indoor air and expel it outside.
  • > Both are designed with energy-efficient technologies such as energy-saving modes or programmable thermostats.
  • > Can be customised in terms of their features and capacity to suit every room’s cooling/heating needs.

What are the main differences between them?

  • > Bulkhead systems aren’t as flexible design-wise since they require a wall-mounted installation. Split systems, on the other hand, can be installed on ceilings or walls.
  • > Cost-wise, bulkhead installation can be higher due to structural modifications to accommodate the unit. Split systems can often be retrofitted into existing spaces!
  • > Maintenance-wise, a bulkhead AC is challenging because of its design. A split system is easier as components are separated between the indoor and outdoor units.

Read: How To Clean Your Split System for Optimal Cooling Performance.

In the market for air conditioning in Bulleen, Bayswater, Forest Hill, Mont Albert, Wandin, Park Orchards, Ormond, Knox, Glen Iris, Wantirna, Wonga Park, or Seville?

Australian Climate Systems comes to you! Simply call us or fill out our online form, and one of our friendly team members will contact you to schedule a consultation at a time that is convenient for you.

Require Reliable Heating & Cooling? Get a Quote at Aust Climate

So, what do you buy for your business or home?

It depends on the size of your property, how you’d like to cool/heat your area, how often you can maintain it yourself, whether your building has capacity for the installation, how often you’re at home, and a myriad of other things! Aust Climate takes your needs into account.

Bulkhead systems are ideal when you want cooling or heating without visible indoor units. They tuck away into ceilings or bulkheads, delivering quiet, distributed air‑flow. Split systems, meanwhile, are often easier to install and maintain, and they provide flexibility and visibility in spaces where ceiling or ceiling-cavity installation isn’t possible.

If you’re weighing up which is right for your Melbourne home (whether it’s a new build, a renovation or an upgrade), Aust Climate can point you to a great cooling system. We are masters of heating and cooling.

In the HVAC business for over 25 years as trained technicians, we offer a 6-year workmanship guarantee for split systems, add-on cooling, multi head split systems, electric heating and cooling, ducted reverse cycle heating and cooling, and more.

Contact us now by calling 03 9726 4444, emailing admin@austclimate.com.au, or checking out our New Season Products in Chirnside Park, Victoria.

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