Split System Air Conditioner: What is it, Types, Working principle and Pros and Cons

A ductless mini-split system is a compact, energy efficient type of split system used where installing ductwork is impractical. It consists of an outdoor compressor/condenser and one or more small indoor wall-mounted or ceiling units.

The main advantages of ductless mini-split systems are:

A multi-split system connects multiple indoor units to one outdoor unit. It enables several rooms to be air conditioned using a single exterior condenser by utilising a branched network of refrigerant piping.

Key advantages of multi-split air conditioner systems include:

Multi-split systems are the preferred ductless heating & cooling solution for larger homes or office spaces. Their expandable nature makes them a versatile choice.

Follow these key steps to choose the correctly sized split system:

Step 1: Calculate the floor area of the room in square metres.

Step 2: Multiply the area by the power required per square metre, which is around .13kw per sqm for Australian homes.

Step 3: Select a system with higher capacity if the room gets a lot of sun or has a high occupancy

Step 4: Consider 2 smaller systems for large spaces rather than 1 oversized unit.

Step 5: Have an OZ Air Group Air Conditioning specialist confirm your estimated size.

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An accurate calculation matching usage needs is important for efficiency. Over or undersized units can cause problems.

An accurate calculation matching usage needs is important for efficiency. Over or undersized units can cause problems.

With multiple performance and lifestyle benefits, adding split system air conditioning is a smart way to upgrade a home.

The noise level refers to the sound power or loudness emitted from the indoor and outdoor units of a split system, measured in A-weighted decibels (dBA). This equates to how noises appear to the human ear.

On average, most split systems produce between 30 to 60 dBA from the outdoor unit and 20 to 40 dBA from the indoor unit during operation. Top brands such as Daikin, Fujitsu, Panasonic, and Mitsubishi Electric have compressor technologies that lower outdoor noise levels to as low as 46 dBA even at high capacity.

Indoor units are noticeably quieter as they contain only the evaporator fan and air distribution louvres. Here sound levels range from faint background noise of 20dBA for some wall mounts, up to around 39dBA for more powerful ceiling cassettes on their highest fan setting.

When selecting split systems, noise is an important factor especially for outdoor units placed near windows and entertainment areas. Models from reputable brands generally have a sound power that does not interfere too greatly during use - but checking specifications or consulting experts is advised for noise sensitive installations.

Disadvantages of installing split system air conditioners include:

While cheaper to install than central systems, split air conditioners can raise maintenance requirements and monthly expenses in the long run. Weighing up these cons is important when making a decision.

Yes, installing split system air conditioning units is a good choice for most Melbourne homes. Split systems are well suited to residential spaces thanks to advancements making them powerful enough even for our hot summers, yet energy efficient and quiet.

Benefits for households include zones control, no major ductwork alterations needed, and flexible installation options. For larger homes a multi-split system or multiple smaller units can be used to avoid a bulky central system.

For commercial buildings with open spaces though, ducted or central systems may be preferable. The multiple vents and zoning control help modify conditions for workspaces or high occupancy levels, despite higher install costs. But for most homes, a quality split system is hard to beat.

Yes, a split system air conditioner is a good option for cooling or heating a bedroom. Their adjustable temperature controls and quiet operation make split system units ideal for rooms where sleep and noise considerations are a factor.

Advantages for bedrooms include allowing desired temperatures to be set at the press of a button, such as creating cooler conditions overnight during Melbourne's hot humid nights. Their ductless, discreet wall mounting keeps rooms visually tidy. Some even have a Sleep Mode optimised for soundless running without disturbing sleep.

For commercial spaces, split systems may not be the most suitable form of air conditioning in all cases. The main downside is that while split systems serve individual rooms well, larger warehouses or open floor offices often favour other types of systems.

The better alternative option for many commercial premises is installing a multi-zone ducted system. Ducted systems have the advantage of providing even cooling or heating to expansive floor spaces through multiple ceiling vents. Though they require major ductwork construction initially, the zoned climate control suits businesses with high occupancy levels or rooms with machines generating excess heat. This makes them preferable for maximising commercial workplace comfort.

So some small offices may install split systems successfully, while noise levels and congested ceiling spaces in others clearly favour ducted systems instead. The intended business use of the buildings drives optimal system selection.

Yes, a split system air conditioner is an excellent choice for the varied climate in Melbourne. During hot summers with temperatures over 30°C, their powerful and adjustable cooling keeps homes comfortable. Split systems also work as effective heaters in winter when overnight temperatures drop below 10°C.

Most quality split systems perform very well across Melbourne's temperature extremes. Features like inverter technologies help them operate efficiently year-round, without drastically spiking power bills in summer or winter. With good insulation, sealants, window coverings and a suitable-sized unit, modern split systems can handle Melbourne's demands.

According to reviews and industry surveys, the top split system air conditioner brands in Australia provide an optimal mix of reliability, features and value for money:

While there are lower cost brands too, these companies consistently offer robust units with great customer satisfaction for Australian conditions. Weighing up professional advice for your home alongside cost finds the best brand fit.

The cost to purchase a split system air conditioner can vary greatly depending on the size, brand, type and features. However, as a general guide for a good quality residential unit from a leading supplier:

The cost to install a split system also depends on the complexity and whether it is a new installation or a replacement job.

Ongoing costs come from:

While split systems may require a notable upfront investment, you can find good home & budget models if you research brands, efficiency ratings and installer deals available in your area.

If seeking a cheaper split system air conditioner, some entry-level brands to consider are:

Going for a discounted or cheap split system unit can work out if less frequent usage is needed. But it's recommended to check the energy efficiency ratings, as less durable parts may cost you more over time. Getting professional advice also ensures your unit meets budget and functional needs. Regular maintenance ensures optimum performance for many years.

The average cost to install a split system air conditioner in Australia is between $800 - $2500 depending on the complexity of the job. In Melbourne, most standard 2.5kW split system installation costs range from $800 for a basic wall mounted unit, up to about $1500+ for more tricky installations.

Factors affecting installation costs include:

Here at Oz Air Group, we offer professional split system installation services across Melbourne and suburbs starting from $800 with a 5 year warranty on workmanship. Get in touch if your home or office needs a split system installed.

Most leading split system air conditioner brands offer warranties of 5 years for residential systems, covering parts and labour on the compressor and other components. Budget models may only offer the legally required 3 year warranty in Australia.

Warranty periods can vary based on:

Yes, it is recommended to perform regular servicing and maintenance on split system air conditioning units. Both the indoor and outdoor components accumulate dust, debris and mould over time which can degrade performance or functionality if not cleaned.

For indoor unit maintenance:

For outdoor unit maintenance:

Following this split system maintenance routine avoids issues and keeps cooling and heating running optimally.

The split system units refer to the air conditioner’s separate indoor and outdoor components. The indoor unit consists of the evaporator coil, filters, drain pan and blower fan. The outdoor unit contains the compressor, condenser coil and an external fan.
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Follow this routine maintenance checklist for your split system's indoor and outdoor units:

Letting dust and debris accumulate by neglecting maintenance causes air flow issues and failures. So remember to care for both units!

The average lifespan of a split system air conditioner is 8 to 12 years. Units that are well-maintained with annual servicing, cleaning and part replacements as required, can potentially operate reliably for over 15 years.

Factors impacting lifespan include brand quality, usage levels, installation quality and ongoing maintenance. Higher-end brands from Daikin, Fujitsu or Panasonic will generally outlast cheaper models.

Following professional care guidelines means your split system should provide many years of effective climate control. If your old unit is playing up, get in touch about a replacement split system - many come with over a decade manufacturer's warranty.

The main alternative air conditioning system types are:

The main difference between a split AC and inverter AC is that standard split ACs have fixed speed compressors that fully switch on or off to regulate temperature. Meanwhile, inverter split ACs have variable speed compressors that continually adjust output to more precisely match the cooling or heating demand needed.

Inverter air conditioner benefits include higher year-round efficiency, quicker room temperature pull-down, quieter operation, and more granular control for comfort. This makes inverter-based split systems ideal for living spaces.

In terms of installation, there is no major difference - standard and inverter split systems have similar indoor and outdoor units connected by piping and cables. The only distinction is that an inverter AC will require an inverter drive to be wired to the outdoor unit.

The main difference is that window AC units are single self-contained systems designed for mounting in windows to service one room. Split AC systems have separate, connected indoor and outdoor units for more flexible installation, zoning and higher whole home cooling capacity.

Split systems offer greater energy efficiency, power, smart features and longevity compared to window units. But window systems take up less internal space and have lower install costs. This makes them preferred for small rooms.

Regarding installation, the key difference is that window ACs are fully integrated systems designed for simple window mounting to service a single room. Split ACs require indoor and outdoor unit installations, with the outdoor unit often wall mounted or placed on concrete slabs. This allows split systems to cool multiple rooms. But window ACs just slot into a window frame without the need for major mounting work.

Yes, split system air conditioners are one of the best air conditioning solutions for coping with Melbourne’s varied climate across the seasons. Their ability to efficiently heat and cool makes them an ideal fit for the city’s hot summers and brisk winters.

For Melbourne homes and apartments, split systems provide reliable and controllable heating and cooling all year round. Features like good timers, energy ratings and zoning capabilities suit the demands of the climate. They remove humidity in summer and provide cosy warmth in winter without excessive energy costs for many households.

Compared to other types of air conditioning like window units or evaporative coolers, split systems offer stronger performance across Melbourne’s climate range. Easy installation also makes them one of the quickest and most effective ways to add climate control. New variable capacity inverter units further improve their climatic suitability.

So for most residential contexts around Melbourne and Victoria, a modern split system air conditioner is hard to beat as an all-purpose heating and cooling solution. They provide the power, features and responsiveness required for living comfortably through harsh summers and cold winters.