Choosing a split system air conditioner is one of the bigger comfort decisions you'll make for your home. Get it right and you have years of quiet, efficient heating and cooling. Get it wrong and you're stuck with high power bills, a noisy unit, or a system that can't keep up on a hot Hunter Valley afternoon. At Entire Trades, we install split systems across Maitland, the Hunter Valley and the Central Coast, and the same handful of decisions come up on every job. This guide walks you through them step by step.

Key Takeaways

• Choosing the right split system comes down to matching capacity to the room, allowing for your home's layout and insulation, and getting the installation right. Brand and price matter, but they aren't the whole story.
• A correctly sized unit costs less to run and keeps you comfortable. Too big or too small and it will be inefficient and disappointing.
• Daikin, Mitsubishi Electric and Fujitsu, the brands we install, all make reliable systems when they're matched to the room and maintained properly.
• Where the indoor and outdoor units go, and who installs them, affects performance as much as the unit you pick.

How Split System Air Conditioners Work (and Why They Suit Most Homes)

A split system has two parts: an indoor unit on the wall that delivers conditioned air into the room, and an outdoor unit, connected by refrigerant pipes, that moves heat out of the house in summer and draws it in during winter.

In cooling mode, refrigerant in the indoor unit absorbs heat from the room and carries it outside. In heating mode the cycle runs in reverse. That's why a reverse cycle air conditioner can handle both heating and cooling, which suits Maitland's hot summers and cold winter mornings without a separate heater.

Compared with ducted air conditioning, split systems are usually cheaper to install and more efficient when you only need to heat or cool one or two main rooms. Ducted systems condition the whole house from hidden outlets but cost more up front. Portable units are cheap to buy but noisy and inefficient, so they're really only a stopgap. If you're still deciding between system types, our guide on how to choose your ideal air conditioning system covers that first step, and what is split system air conditioning explains the basics in more detail.

Step 1: Match the Air Conditioner Size to the Room

Getting the size right is the single most important step. Split system size is measured in kilowatts (kW). That's how much heat the system can move, not how much electricity it uses.

Before you ask for a quote, note these details for each room:

• Room length and width
• Ceiling height (high or raked ceilings need more capacity)
• Number and size of windows, and which way they face
• Wall type and insulation
• How many people usually use the room
• Whether the room opens onto other areas

Floor area gives you a starting point, but orientation, insulation and glass can push the real requirement up or down. That's why we work out the heating and cooling load on site before recommending a size.

What happens if you get it wrong? An undersized unit runs flat out on hot days and never quite gets the room comfortable. An oversized unit switches on and off every few minutes (short-cycling). That wastes energy, wears the system and leaves the room feeling clammy, because it never runs long enough to pull moisture out of the air.

Step 2: Consider Your Home's Design, Insulation and Local Climate

Room size is only part of the picture. How your home is built, and how much sun it gets, decides how hard the system has to work.

• Ceiling insulation: A well-insulated ceiling holds cool air in summer and warmth in winter. Poor insulation means more capacity is needed to get the same result.
• Wall construction: Brick veneer and weatherboard heat and cool at different rates, and rooms with more external walls swing more in temperature.
• Windows and glazing: Single glazing lets more heat through than double glazing. Large west-facing windows take the full afternoon sun.
• Shading: Eaves, verandas, awnings and external blinds cut heat gain and can reduce the capacity you need.

Local conditions matter too. Inland areas like Cessnock and Singleton tend to run hotter in summer, while Central Coast homes deal with more humidity and, close to the beach, salt air. If your home has obvious gaps around doors and windows or patchy ceiling insulation, sorting those first can mean a smaller, cheaper-to-run system.

Step 3: Choose the Type of Split System for Your Layout

Most homes suit a standard wall-mounted split, but other styles work better in some layouts.

• Single split systems pair one indoor unit with one outdoor unit. They're the go-to for a lounge room, bedroom or study: simple to install and easy to maintain.
• Multi-head (multi-split) systems run several indoor units from one outdoor unit. They suit townhouses and small blocks where there's only room for one outdoor unit, but installation is more involved.
• Floor-standing units work where wall mounting isn't practical.
• Ceiling cassettes suit rooms with limited wall space or lots of glass.

In many homes, two or three modest splits give you separate control of each room (bedrooms at night, living areas during the day) and run more efficiently than one oversized unit trying to cover several rooms. We can walk you through the options on site, looking at access, appearance and what you might add later.

Step 4: System Placement for Airflow, Noise and Long-Term Reliability

Where the indoor and outdoor units go matters as much as which model you buy.

Indoor unit:

• Mount it high on the wall so cool air falls naturally through the room
• Avoid blowing directly onto beds or couches
• Keep it clear of tall furniture so air can circulate
• Leave room below for easy filter cleaning

Outdoor unit:

• Sit it on a solid, level pad or a sturdy wall bracket
• Keep it away from bedroom windows, yours and the neighbours'
• Allow the manufacturer's recommended clearance on all sides
• Avoid spots that flood, collect leaves or bake in the afternoon sun

Narrow side paths on many Maitland homes can limit where the outdoor unit fits, and strata properties often have rules about balconies and common areas. We recommend specific locations on site and spell them out in your written quote.

Step 5: Noise Levels and Quiet Operation

Noise matters most in bedrooms and home offices, especially at night when every hum stands out.

When comparing units, look for:

• Quiet or night modes that reduce fan speed and compressor output
• Multi-speed fans for finer control of airflow
• Inverter technology, which ramps the compressor up and down smoothly instead of constantly stopping and starting
• Sensible placement: outdoor units away from bedrooms, indoor units aimed away from where people sleep

Each manufacturer publishes indoor and outdoor sound levels for its models. Ask your installer which models in your size range are quietest rather than relying on general online comparisons.

Step 6: Energy Efficiency, Running Costs and Controls

Heating and cooling is one of the biggest energy costs in most homes, so efficiency is worth weighing up over the life of the system.

Check the Zoned Energy Rating Label on any model you're considering. It shows separate ratings for hot, average and cold climate zones, so you can compare models on the zone that matches where you live. More stars means better efficiency, and a more efficient unit usually costs less to run each year even if it costs a bit more to buy.

Inverter systems adjust their output to match demand rather than cycling on and off at full power, which saves energy and keeps the temperature steadier. Features like Wi-Fi control, timers and eco modes help avoid running the system in an empty house.

Ways to keep running costs down:

• Set a sensible temperature rather than the coldest setting on the remote
• Use timers so the system isn't running when nobody's home
• Don't oversize "just in case", because an oversized unit costs more to run and is less comfortable

When we prepare your quote, we can compare the efficiency ratings of suitable Daikin, Mitsubishi Electric and Fujitsu models side by side.

Step 7: Air Quality, Filters and Health Considerations

Indoor air quality matters, especially for families with allergies or pets.

• Standard filters catch dust and lint and protect the indoor coil. A clogged filter restricts airflow and pushes up running costs, so clean them regularly.
• Upgraded filtration on some models adds finer filters or air-cleaning features aimed at pollen, odours and fine particles.
• Humidity control comes naturally from a correctly sized reverse cycle split, because it runs long enough each cycle to pull moisture out of the air.

Split systems aren't medical devices. If you have asthma or allergies, talk through your needs with your installer, and with your doctor for health advice.

Step 8: Brand Choices: Daikin, Mitsubishi Electric and Fujitsu

Entire Trades installs three established brands of split system: Daikin, Mitsubishi Electric and Fujitsu. Each offers a range of capacities and feature levels, from straightforward models for a spare bedroom to units with smart controls and upgraded filtration for main living areas.

There's no single best brand. The right choice depends on the room, your budget, how sensitive you are to noise, and which features you'll actually use. A correctly sized, well-installed mid-range unit will usually outperform a premium model that's the wrong size or poorly installed.

We'll explain the trade-offs between specific models from these three brands when we quote, based on your home rather than online hype.

Step 9: Installation Quality, Safety and Compliance

Installation quality has a big effect on how well a split system performs and how long it lasts. A poor install can lead to refrigerant leaks, drainage problems and early failure, even on an expensive unit.

In NSW, a split system install needs a licensed electrician for the power supply and circuit work, and a licensed refrigeration technician for the refrigerant, pressure testing and commissioning. At Entire Trades, one licensed team does both, so there's no handballing between contractors.

A good installation includes:

• Correct pipe sizing and length for the system's capacity
• Solid mounting with vibration isolation
• Proper condensate drainage so water doesn't pool or leak
• The correct refrigerant charge
• Neat, protected cabling
• Testing in both heating and cooling modes

Manufacturer warranties generally depend on correct installation and regular maintenance by licensed trades, so a shortcut install can cost you later.

Step 10: Installation Cost, Access and Future Maintenance

How involved the installation is depends on the job, not just the size of the unit. A ground-floor install with a short pipe run is a very different job to running pipes up a two-storey brick wall.

Things that affect installation complexity:

• The length of the pipe and cable run between the indoor and outdoor units
• Whether your switchboard has room for a new circuit
• Wall type (double brick takes more work than plasterboard or weatherboard)
• Where the outdoor unit goes: ground level, upper storey, balcony or bracket
• Whether a new pad or bracket is needed
• Site access, such as tight side paths, steep blocks or strata areas

Our quotes are free, written and itemised, so homeowners in Maitland, Kurri Kurri, Cessnock and beyond can see exactly what's included before they commit. Think about maintenance access too: can the outdoor unit be reached safely for servicing, and can you get to the indoor filters easily?

Maintenance, Cleaning and Getting the Best From Your System

Even a well-chosen split system needs regular care to stay quiet and efficient.

• Clean the indoor filters every few weeks during heavy summer and winter use
• Keep the area around the outdoor unit clear of leaves and clippings
• Check the condensate drain is flowing, as a blocked drain can cause leaks inside

A periodic service by a licensed technician checks refrigerant, electrical connections, fans and coils. That's especially worthwhile for units working hard in main living areas.

Balancing Budget, Features and Long-Term Value

The best split system is the one that gives you the best long-term value, not the one that's cheapest on the day.

• It often pays to spend a little more on a more efficient unit, or a quieter one for bedrooms and offices.
• Smart features and upgraded filtration are handy in main rooms but not essential everywhere. A basic unit may be all a spare room needs.
• A correctly sized mid-range unit, installed properly, is often better value than an oversized premium model.

When comparing quotes, look at what's included: brand and model, rated capacity, installation details, warranty and after-sales support, not just the total.

When to Call a Local Expert (and How Entire Trades Can Help)

Once you know which rooms you want to heat and cool, the next step is a site visit. That's where general advice becomes advice for your home.

What you get with Entire Trades:

• A family-owned team based in Maitland, serving the Hunter Valley and Central Coast since 2017
• Daikin, Mitsubishi Electric and Fujitsu split systems
• One licensed team for both the electrical work and the air conditioning install
• Free, written, itemised quotes with no hidden charges

Call us on (02) 4905 0901 or see our split system air conditioning Maitland page. We'll confirm the right size, placement and model for your home and put it all in writing before any work starts.

Frequently Asked Questions About Choosing a Split System Air Conditioner

How do I know if my current air conditioner is the wrong size?

Common signs are a unit that runs non-stop and still can't reach the set temperature, or one that short-cycles, switching on and off every few minutes and leaving the room clammy. Hot and cold spots in the same room also point to a sizing problem. We can check the existing unit and the room and tell you whether resizing or adding a second system would help.

Can one split system air conditioner do my whole house?

A single wall-mounted split is designed for one main area, such as a lounge room or open-plan kitchen and living space. It won't evenly heat or cool a house full of separate rooms and hallways. For larger or two-storey homes, multiple splits or a ducted system is usually the better answer.

Do I need approval to install a split system in a unit or townhouse?

In strata properties you often need approval from the owners corporation before putting an outdoor unit on common property or a balcony. Check your by-laws for rules on appearance, noise and drainage. A written quote with the proposed unit locations can help speed up approval.

Will a split system improve my home's air quality if I have allergies?

A split system can help by filtering dust and some airborne particles, and some models have upgraded filtration for finer particles like pollen. Keeping the filters clean is essential. For health advice specific to you, talk to your doctor.

How often should I service my split system air conditioner?

Clean the indoor filters every few weeks during heavy use and at least once a season otherwise. Have a licensed technician service the system regularly, and more often if it works hard in a main living area or a dusty spot. Entire Trades services split systems across Maitland, the Hunter Valley and the Central Coast to keep them efficient, quiet and reliable.