16 Things to Consider Before Installing an Air Conditioner Unit
If you are thinking of installing an air conditioning unit, then this guide is for you.
Australian summers aren’t getting kinder anymore. Whether you’re sweating through the sticky heat up north or dealing with dry, scorching days inland, we all know how uncomfortable it gets.
Before you rush to install an air conditioner, though, there are a few things to think about. And it’s not just picking a brand and hoping for the best.
Aircon isn’t one-size-fits-all. Things like power size, room shape, and house layout can make a big difference in how well it cools.
Let’s walk through the 14 most important things you should consider before installing an air conditioning unit that will give you comfort in the long run.
Things to Consider Before Choosing an Air Conditioning System
If you’re almost settled on split system air conditioning or you just need to select your exact model, these tips are perfect for you.
As you probably already know, this type of air conditioner is split between an indoor unit (the head unit) and an outdoor unit. Split systems are space heaters and coolers, meaning they’re designed to maintain the ideal temperature in a single room, such as a bedroom, living room, lounge, or home office.
If that sounds like what you need, check out the following tips to ensure you’re choosing the best split system air conditioning unit for your space.
1. Your Air Conditioner Must Suit Your Home
When you are searching your system, you need to ask one thing to yourself: “What do I actually need to cool down?”
Is it only one room or more than one bedroom? Or the entire home when guests drop by?
If your home has a big open space or double-storey design, heating and cooling is much harder than in a small unit or apartment. And it’s not just about square metres, it’s all the game of your lifestyle and how you use the space.
Your split system needs to match the size and purpose of the room. Bedrooms may need quieter units, while larger living areas require more power. Split systems can be installed upstairs too, even on rendered walls. For heating and cooling several rooms, standalone and multi-split configurations are both applicable, though multi-splits tend to be more complicated to install due to their more intricate setup, albeit requiring fewer outdoor units.
So, don’t jump into installing an air conditioning unit based on someone else’s setup. Take a proper look at your own space. That alone could save you thousands.
2. Choosing the Right Air Conditioner Size Matters
A properly sized split system ensures efficiency and comfort. Factors like room size, insulation, windows, and wall material all impact the required system power.
When choosing a split system size, consider:
- Room size – Bigger rooms need more power or larger AC units.
- Insulation – Poor insulation may require a larger unit.
- Windows – More or larger windows = more heat loss.
- Wall material – What are the walls made of? Solid brick retains temperature better.
When choosing an air conditioner, don’t just look at how big it looks on the outside. What really matters is its cooling power. As a rule, you’ll need about 0.15 kW of power for every square metre of room space.
Oversized units waste energy, while undersized ones overwork and wear out quickly. Always confirm your installer is recommending the right size for your space. Don’t let a salesperson talk you into something oversized or underpowered. The right system is the one that matches your space, not just your budget.
3. It Must be an Inverter Split System with High Efficiency
Choose a split system with inverter technology and a high energy star rating for better energy efficiency. The more stars your system has, the more you save later. Especially if you’re someone who runs the air con day and night through summer.
Inverter models allow the compressor speed to increase and decrease gradually, using less power than other traditional compressors and providing more consistent comfort. quality, and performance in terms of airflow. So, while installing an air conditioning unit, you must prioritize energy efficiency as it makes a huge difference between chilled comfort and sweating over your electricity statement.
| What You Need to Know | Evaporative Cooling | Air Conditioning |
|---|---|---|
| Best for | Dry, hot locations | Any weather, especially humid |
| How it works | Water evaporation | Refrigerant + heat exchange |
| Energy use | Low | Higher |
| Moisture effect | Adds moisture to air | Removes moisture |
| Filters/Fans | Uses fresh outside air | Recycles indoor air |
| Cost to install | Lower | Can be high depending on system |
| Comfort level | Depends on outside air Moderate–variable | Constant, adjustable cooling Exact temperature control |
Plan Your Install the Smart Way
4. When buying, Budget Is the Top thing to Consider
One of the most common mistakes people make is budgeting only for the unit, not the installation, the wiring, the electrician, or any extras like roof brackets or piping. Say you see a split system for $1,100. Sounds really affordable. But when you add in install costs, extra cabling, a new switchboard (maybe), it suddenly becomes $2,500+. So when planning for installing an air conditioning unit, always think of the total package, not just the sticker price.
Never go for a cheaper unit, it may cost more in energy bills over time. Often, paying more upfront means better energy efficiency and lower running costs. Always compare energy ratings within your budget to get the best value.
Tip: If you’re hiring a professional, get a few written quotes and ask what’s included. Avoid surprises later.
5. Think About Air Quality Features When Installing a New AC
When choosing an air conditioner, don’t just focus on hot or cold air, think about clean air too. Air conditioners move the air around, so if you or someone in your home has asthma, allergies, or hay fever, the filters and air cleaning features matter. Cleaner air makes a bigger difference than you might think. If you’ve ever had that “stuffy air” feeling with older ACs, you’ll appreciate a good system that keeps the air fresh and light.
Look for units with:
- HEPA filters
- Plasma or ionising filters
- Dehumidifier modes
- Odour-removing technology
Many modern split systems include advanced purification features like Panasonic’s Nanoe X, which removes bacteria and odours, which is especially helpful for homes with asthma or allergy sufferers.
6. Split Systems Come with a Variety of Stylish Options
While size and performance are key, it’s also important to note that split systems offer a range of aesthetic choices. Different brands and models of air conditioners come in a variety of sizes, shapes, and even colours!
From sleek, slimline designs to units available in different colours beyond the usual white, various brands let you choose a style that complements your home. Appearance should not be your main focus, but it’s worth considering when making your final decision because you are paying an amount so why not consider how it looks too?
7. Think About the Noise You Don’t Want to Hear It All the Time
Not every aircon unit is whisper-quiet, and trust me when it isn’t, you’ll know.
Some old models or cheaper air conditioner models can make a hum, rattle, or even a high-pitched whine sound especially when you’re trying to eat or watch TV. And if the outdoor unit isn’t placed properly, it might even disturb your neighbours.
So before buying an air conditioning unit, check the decibel levels. Anything around 19–30 dB indoors is considered very quiet. For outdoor units, below 55 dB is good for most areas.
Don’t just trust the specs. If you can, ask to hear a unit in action or check reviews from people who’ve lived with it.
AC Install? Read This First
8. Lastly, a Brief Note on Reverse Cycle Air Conditioners
Up until now, we’ve been describing split systems as units that both heat and cool. If your split system is a reverse cycle model, this is absolutely correct.
Nowadays, most split systems on the market are reverse cycle, though cooling-only models are still out there. If you want one unit that provides both heating and cooling, be sure you’re choosing a reverse cycle split system.
Air Conditioner Installation Considerations…
So you have got all the knowledge you need to choose the best air conditioner for your home. Now we are moving towards the things to consider during installation of an air conditioner.. It is true that a professional will handle the whole installation, but this helps to understand the process so you can share your preferences and ensure it’s done right.
9. Positioning Your AC Matters The Most
Where you install both the indoor and outdoor units matters more than most people realise.
Put the indoor unit above a doorway? You might only cool half the room. Or mount it pointing directly at your bed? You’ll wake up frozen or sneezing.
As for the outdoor unit, you’ll want it where it can “breathe” good airflow and keeps it efficient. Keeping it off the ground is flooding a risk, and away from bedroom windows unless you like the gentle hum of machinery at night.
When you’re installing an air conditioning unit, think of placement like real estate: location, location, location.
| Placement Tip | Indoor Unit (Split System) | Outdoor Unit |
|---|---|---|
| Ideal Mounting | High on external wall, centered in room | On stable wall or ground, ideally behind indoor unit |
| Clearance | Min 15cm clearance for airflow & servicing | Clear space around unit for airflow |
| Comfort Considerations | Above beds/couches = faster cooling | Shaded spot preferred; avoid full sun |
| Design & Aesthetics | Can be placed above windows; match width | Blend with fence or wall if visible |
| Things to Avoid | Avoid above art, mirrors, stoves, or direct overhead beds | Avoid trees, plants, and debris buildup zones |
10. Maintain the Right Distance Between Outdoor and Indoor Units
In addition to thinking about the indoor and outdoor units on their own, it’s also important to consider their connection.
To get the best heating and cooling results and to make installation easier, your indoor and outdoor units should ideally be no more than about 15 metres apart. Installing them on opposite sides of the same wall, and at suitable heights, is the ideal setup.
11. Make Sure You Select the Right Wall
Whenever possible, go for an exterior wall that’s strong and stable. Avoid weak or uneven walls like false panels or foam render.
If you know a wall might not be suitable, let the installer know but a good technician will always pick the safest, most secure option.
12. Think About Zoning If You’re Going Ducted
If you’re considering a ducted system, zoning is a game-changer.
What’s zoning? It basically lets you divide your home into different temperature zones. So you can cool the lounge while keeping the bedrooms off, or run the whole house when guests are over. This not only improves comfort, but it also cuts down on electricity costs, no point cooling rooms no one’s using, right?
So when installing an air conditioning unit, especially ducted ones, ask your installer about zoning. You’ll thank yourself later.
13. Can Your Switchboard Handle It? Consider
Now, this might sound boring, but bear with me it could save you from a major headache.
Some older homes (and even newer ones) simply weren’t wired for modern high-powered systems. If you go and install a big reverse-cycle ducted setup without checking your electrical load, you might trip the system. Or worse, blow a fuse mid-heatwave.
A quick visit from an electrician can sort this. They’ll tell you if your board needs an upgrade, or if you need a new dedicated circuit. It’s a small check that makes a big difference.
14. Drainage Considerations for Your Split System
Both the indoor and outdoor units of your split system need proper drainage, and this must be factored into the installation. Now, if you’re mounting the indoor unit on an internal wall instead of one that leads straight outside, you might need a condensation pump. Why? Because there’s no natural place for the water to drain.
Don’t stress though, your installer should handle all this. Just make sure to ask the question, especially if the wall you’ve chosen isn’t right up against the exterior. It’s a tiny detail that can save you from some seriously annoying drips later on.
15. Pick a Local Installer for Quick Help and Peace of Mind
Your installer should get the job done right the first time but hey, nothing’s perfect. Things can go wrong, even with the best systems. That’s why it pays to choose a local heating and cooling expert. If something goes sideways or you need maintenance or warranty work later on, they’ll be close by and ready to help fast.
If you’re after quick, hassle-free split system installs or servicing in Melbourne or nearby suburbs, the team at Powerband Electrical has got your back.
16.Every Split System Installation Should Be Professional and Fit You
All the advice you’ve read so far? It’s solid but no two homes (or comfort needs) are exactly alike. That’s why your split system installation should always be tailored to suit you. Whether you’re installing it in the bedroom, living area, or upstairs retreat, the right placement makes all the difference. Maybe you don’t want cool air blowing directly on you while you sleep but when placing the indoor unit off-centre, rather than smack in the middle, might be smarter. And while external walls are usually ideal, sometimes they’re just not an option. A skilled installer will adapt with smart solutions for internal walls without overcomplicating or overcharging.
At last, it’s all about how you want to live and feel in your space. So yes, know your preferences and understand the basics but when it comes to actually doing the work, leave it to the pros. Professional installation ensures your unit works efficiently, your warranty stays intact, and you avoid any costly (or dangerous) DIY missteps.
If you’re in Victoria or anywhere nearby, Powerband Electrical team is here to help from expert advice and product selection to reliable installation. We tailor every job to your property and your comfort. That’s how it should be.
Conclusion
So, you’re thinking about installing an air conditioning unit, good on you. It’s not just about escaping the heat. It’s about making your home feel right, no matter the season.
There’s a bit to think about, sure size, placement, budget, power needs, filters, smart features… but it’s worth taking that time. Because once it’s in, it’s not just comfort it’s peace of mind.
And now that you’ve got the facts? You’ll make a choice that fits your home, not just someone else’s ad or sales pitch. Take your time. Ask questions. Get it done right. Your future cool, comfy self will thank you.
Don’t Rush Your AC Decision
FAQs
Honestly? Don’t wait for the heatwave. Summer installs are rushed, expensive, and booked out. Spring or autumn is way calmer. Plus, you’re sorted before things get sweaty.
Depends on the type and setup. For a standard split system, $600 to $1200 is common in Australia. But if your place needs extra wiring or wall work, that price climbs. Best to get a couple of quotes first. Every home’s a bit different.
If you live somewhere that gets chilly winters too? Definitely. Reverse cycle keeps you warm and cool using the same system. It costs a bit more up front, but saves money and space long term.
Short answer no. Not legally, and not safely. You need a licensed tradie in Australia. Doing it yourself can wreck your unit, your warranty, or your insurance.
If you look after it, clean the filters, service it now and then, most good units last 10 to 15 years. Cheap ones? Might not make it past 7 or 8. Regular maintenance = longer life.