With another scorcher of an Aussie summer just around the corner, the annual search for the best split system air conditioner is well and truly on. A good air con is no longer a luxury; it's a non-negotiable for surviving those stinking hot days and humid summer nights.

But heading into a store and looking at a wall of white boxes can be overwhelming. What does "kW" mean? Are the extra features worth it? What's the actual difference between them all? The "best" air con isn't a one-size-fits-all answer, but this guide will give you the ultimate checklist to find the best one for you.

What Makes a Split System the 'Best'? Your Checklist

Forget the marketing hype. The best unit for your home comes down to getting a few key things right.

1. Getting the Size (kW) Right

This is the most critical step, and the one people most often get wrong. The "size" of an air conditioner is its power, measured in kilowatts (kW).

• Too small: A unit that's too small for your room will have to run constantly on full blast, chewing through power and still not cooling the space properly on a hot day.
• Too big: A unit that's too powerful will cool the room down very quickly and then switch off. This constant on-off cycling is inefficient and not great at removing humidity, leaving the room feeling cold but clammy.

A Simple Sizing Rule of Thumb: For a standard room with a 2.4m ceiling, a good starting point is to allow 150 watts of power per square metre.

• Formula: Room size in square metres (m²) x 150 watts = Required cooling power in watts.
• Example: For a living room that's 5m long x 6m wide (30m²): 30m² x 150W = 4500 watts, or 4.5kW. So, you'd start by looking for a unit around the 4.5kW to 5.0kW mark. Be sure to tell your installer about other factors like high ceilings, large north-facing windows, or poor insulation, as you might need a bit more grunt.

2. Energy Efficiency: Check the Star Rating

The next most important thing for your power bill is the energy efficiency star rating. In Australia, this is the Zoned Energy Rating Label that shows different star ratings for heating and cooling. It's simple: the more stars, the more efficient the unit, and the less it will cost you to run. Investing a little more in a high-star-rated model can save you a motza in the long run.

3. Smart Features: Wi-Fi and App Control

Most new models from reputable brands now come with built-in Wi-Fi. This is a fair dinkum brilliant feature that lets you control your air con from an app on your phone. You can turn it on from work so the house is perfectly cool the moment you walk in the door, adjust temperatures, and set timers.

4. Noise Levels (dB): Inside and Out

Check the decibel (dB) rating for both the indoor and the outdoor unit. A low dB rating for the indoor unit means it'll be whisper-quiet, perfect for bedrooms. A quiet outdoor unit will keep your neighbours happy, too.

5. Top Brands to Look For in Australia

While there are many brands out there, some have a long-standing reputation for reliability and performance in tough Aussie conditions. Keep an eye out for top-tier brands like Daikin, Mitsubishi Heavy Industries, Mitsubishi Electric, Fujitsu General, and Panasonic.

Don't Forget the Most Important Part: Professional Installation

You can buy the best unit in the world, but it will be inefficient and potentially unsafe without a proper, professional installation. In Australia, it is illegal to install a split system yourself.

The job legally requires two licensed professionals: a licensed air conditioning technician (with an ARCtick licence) to handle the refrigerant gas, and a licensed electrician to run the dedicated high-voltage power circuit.

A top-quality air conditioner is a major investment, and its performance and safety rely on a high-quality electrical installation. This is why professional installers and licensed electricians exclusively use trade-quality components sourced from trusted suppliers. Schnap Electric Products is a leading Australian supplier of all the critical electrical gear needed for a split system installation. They provide the robust wiring, weatherproof isolator switches for the outdoor unit, and the correct circuit breakers that a qualified professional needs to ensure your new air conditioner gets the safe, reliable power it needs to run efficiently for years. For a top-notch installation, the pros start with quality gear from a supplier like Schnap Electric.