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12 Things to Consider Before Installing a Split System Air Conditioner

12 Things to Consider Before Installing a Split System Air Conditioner

Last updated on May 11, 2025

You’ve finally reached the point where you can’t take it anymore. Night after night, you toss and turn, drenched in sweat, desperate for relief.

No matter the season, certain rooms, maybe the upstairs bedroom, the sunlit front lounge, or that cold back office, are always just off.

The idea of a consistently comfortable home starts to sound less like a luxury and more like a necessity.

Maybe, you think, a split system in that one problem room is all it takes to fix it.

You are absolutely right, but before you make the split system air conditioner installation, here are 12 essential things to think about.

1. Know Your Space and Pick the Matching AC

Split system air conditioners are designed to condition a single room.

Therefore, when selecting one for your use, the first thing that needs to be in your mind is the room you need to cool or heat.

The more you understand about the usage space, the closer you are to determining an optimal system for the task.

Assume, for instance, you want to condition your bedroom. The best choice for this task would be a silent air conditioner with features like sleep mode or low fan speed. 

If you are targeting a larger space, for instance, an open-plan space or living room, you’ll require a more powerful system to cool the space evenly.

For small spaces like an office or nursery, a compact indoor unit would serve best without overwhelming the space or appearing bulky against the wall. 

Lastly, if you aim to condition more than one room, consider a multi-split system. 

2. Make Sure You Choose the Right Size AC

One of the most important things when considering a split system air conditioner installation is getting the correct size.

Make the mistake of choosing the wrong size, and you will face tough consequences. 

They include insufficient cooling or heating when you choose too small or too high power consumption, huge bills, and possibly a shorter unit lifespan if you choose too big.

While your AC installation expert will help you pick the right size, knowing how to determine it yourself can boost your confidence in getting things done correctly. 

Ask yourself the following:

  • How big is the room? Larger spaces need bigger systems.
  • How well insulated is the room? Poor insulation may require a larger system.
  • How many windows? Extra windows can increase heat loss, requiring more power.
  • What are the walls made of? Solid brick retains heat better than other materials.

Remember: Size isn’t just about the physical dimensions of the unit; it’s about power. 

Go for around 0.15 kw of power for each square meter of space if you need a well-performing unit.

3. Ensure the Best Placement Spot for Your AC

Before buying a split system air conditioner, ensure you have the optimal positioning area since it can have a direct impact on the performance of your system.

For the indoor unit, make sure you have high walls as they are the best place to install. Why?

Because cold air descends according to principles of physics. So, by putting the split system higher up the wall, you are enabling improved cooling in your home.

In addition to ensuring higher walls, you need to make sure that the indoor unit location point is away from obstacles such as furniture, curtains, or shelves, which can restrict airflow and reduce the performance of the AC.

For the outdoor unit, ensure that your space is free from obstructions and features good airflow. The area needs to be shaded from direct sunlight as it can influence the dissipation of heat from the AC.

4. Verify Your Electrical System

The electrical system is your next point to consider when planning a split system air conditioner installation.

Ask yourself, “Can my wiring handle an additional power-hungry appliance without an upgrade?”

An air conditioner may use more power than most everyday appliances, so it may need its dedicated circuit for safe operation. 

If you suspect that your electrical system is below standards or does not have enough power supply, upgrade earlier.

If you’re in doubt, bring in our qualified electricians. They can check your home’s wiring and determine whether it complies with all building codes and is ready to support the AC load. 

Don’t skip this step, as below-standard electrical work can be dangerous if overloaded.

5. Consider Energy Efficiency During Split System Air Conditioner Installation

You can’t debate modern AC systems without mentioning their efficiency.

A highly efficient system consumes less electricity, contributes lower environmental impacts, and ensures overall comfort at affordable costs. 

One way to gauge efficiency is by checking the AC unit’s Energy Star rating. These ratings are assigned depending on how efficiently the unit can consume power to deliver the desired cooling or heating. 

Go for units with higher Energy Star ratings, as it means lower energy consumption and utility bills.

In addition to considering the Energy Star, prioritise features like inverter technology, which adjusts the compressor speed for more consistent temperature control and less power wastage. 

Also, remember to factor in the unit’s cooling and heating capacity and choose according to your space size. Don’t choose too large or too small, because in either case, you will experience the disadvantages we already talked about.

Finally, consider energy-saving modes or smart features like app-based controls and timers. They let you control how and when your AC works, so you save energy and bills when it’s not needed.

6. Noise Levels Matter

If you are selecting a split system AC, what you need is one that provides comfort rather than distraction. Therefore, before split system air conditioner installation, you need to take into account the noise level of the AC unit.

Quiet operation is highly desirable for comfort in bedrooms, home offices, or nurseries where disturbance from the background is undesired.

The noise rating of split system indoor units is usually 25-50 decibels. Some models have the advantage of being quieter with features like ‘quiet mode’ and low fan speeds.

Outdoor units can be louder, reaching up to 45–60 decibels. Consider those that have lower outdoor noise ratings if you intend to install adjacent windows, living spaces, or shared boundaries with neighbours.

7. Factor in Installation Costs

While budgeting for a split system air conditioner installation, don’t overlook installation because that’s where unexpected costs creep in. 

The cost of a basic back-to-back installation can vary from $600 to $1,500. But if your installation is more complicated, e.g., a multi-story house or tight access, set aside $2,000 to $3,500 or even higher.

On top of these charges, you may have to pay for extras such as electrical upgrades ($200–$800), wall brackets ($130–$220), or extra piping for around $20–$40 per meter. 

Installation fees can also differ based on your state, with NSW, QLD, and VIC averaging at $500 and $1,000 for basic installation jobs.

As a rule of thumb, budget for an initial investment of $1,000–$2,500 for both basic and optional fees.

8. Check for Rebates and Incentives

Before paying for your new air-conditioner, take a minute to see if you can claim any rebates or incentives. Throughout Australia, various state governments, councils, and energy companies offer rebates for purchasing energy-efficient models. 

For instance, NSW’s Energy Savings Scheme and Victoria Energy Upgrades Scheme offer rebates occasionally for energy-efficient upgrades, including split systems. 

You may also be liable for cashback offers or a discounted split system air conditioner installation from retailers when you purchase high-star-rated models.

All these incentives and rebates aim at lowering your initial purchase and installation costs, so you get an energy-saving model that is more affordable.

9. Know the Maintenance Requirements

Regular maintenance is a guaranteed method of ensuring your conditioning system functions efficiently after installation. It avoids breakdowns and early wear and tear, hence increasing the lifetime of your system.

So, before buying your split system air conditioner, ensure that you are prepared for its maintenance. 

With most systems, you should be ready and willing to clean filters every 3-6 months and keep the outdoor unit clear of debris.  This is important as it helps to ensure sufficient airflow and prevent strain on the components. 

You should also be ready to pay a qualified technician annually for the unit’s inspection. This can cost you roughly $100–$200, depending on your location and the technician’s rates.

10. Consider the Aesthetic Appeal

Split system air conditioners are no longer simply a matter of performance — design goes into it as well. The indoor unit will take centre stage on your wall and thus needs to feature a design that’ll enhance your room’s appearance.

Contemporary units are available in a variety of styles, ranging from minimalist and sleek to futuristic and bold. Find a model whose colour and finish are in accordance with those of your room.

You can also choose those with adjustable panels or low-profile models that can blend into the background easily.

Though appearance alone should not determine it, a performing unit that looks good in your living environment is always going to feel like a wiser investment.

11. Ensure You’re Hiring a Qualified Installer

Regardless of how efficient your split system air conditioner is, an improper split system air conditioner installation can destroy its performance, effectiveness, and longevity.

That is why hiring a qualified and experienced installer is not negotiable.

In Australia, hire installers with a Refrigerant Handling License and who are registered with the Australian Refrigeration Council (ARC).

Such a technician not only installs the system safely and according to the manufacturer’s specifications but also places the indoor and outdoor units in a way that ensures optimal performance.

Always check their documents, experience, and warranty claims before engaging them, just to ensure you are making the right choice.

12. Check the Warranty and After-Sales Support

Before locking in your split system purchase, take a close look at the warranty and what kind of support the brand or installer offers after the sale. 

A good unit should come with a manufacturer’s warranty of at least five years, covering both parts and labour. This gives you peace of mind in case anything goes wrong.

In addition to warranty terms, pay attention to the reputation of the brand and installer when it comes to after-sales service. 

Quick response times, accessible support teams, and clear communication can make a huge difference if you ever need repairs or assistance. 

Choose a brand that not only sells the system but also stands by it long after the split system air conditioner installation.

Split System Installation: Common Questions & Answers

Can you install a split system anywhere?

You can install a split system in most areas, but certain conditions must be met. First, you need a solid wall with enough clearance for the indoor unit. 

Second, you need a space with good airflow for installing the outdoor component. Some properties, like apartments or older buildings, may have limitations that require professional assessment.

Do split systems use a lot of electricity?

No. Split systems are generally energy efficient, especially inverter models with high star ratings.  They automatically adjust power based on the temperature needs of your room, thus saving more power. 

How much space do you need for a split system air conditioner installation?

You need space on an internal wall for the indoor unit with room above and around it for air circulation. 

The outdoor unit should be placed in a clear and ventilated area with easy access for maintenance. 
Following local regulations and manufacturer guidelines is essential to ensure the installation is done correctly.

How many mini-splits do I need for a 5-bedroom house?

A five-bedroom home usually needs a multi-split system with several indoor units connected to one outdoor unit. 

The exact number depends on room sizes, layout, and how often each room is used. 
Consult your licensed installer for the proper setup based on a load calculation.

What is the common problem with a split AC?

The most common issue is poor airflow caused by dirty filters that block circulation. This can reduce cooling efficiency and put stress on the system. Cleaning the filters regularly helps prevent breakdowns and keeps the system running smoothly.

What is the lifespan of a split AC?

Most split systems last between 12 and 15 years and require proper maintenance as directed by your installer and manufacturer. Ensure you regularly service and clean the filter if you wish to extend its lifespan. 

Is it okay to run the split AC all day?

Yes, running a split AC all day is generally safe if the system is working correctly. 

Modern units are designed to be energy-efficient even during long operations. However, ensure the unit is frequently checked and well-maintained at all times.

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Melissa Bank

At E-Green Electrical, Melissa writes about energy saving solutions, solar energy, energy conservation and electrical product reviews. She is most interested in how we can utilise technology and renewable resources to reduce energy consumption, prevent pollution and save money at the same time.

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