Your guide to choosing the right air conditioning system for your home

Key takeaways

• The right air conditioning system depends on your home layout, insulation, ceiling height, daily usage and whether you want cooling only or year round comfort.
• Split systems suit bedrooms, living rooms and smaller spaces, while ducted air conditioning is better for whole-home comfort across multiple rooms.
• Evaporative cooling can work well in Perth’s dry summer conditions, especially in open-plan homes with good airflow.
• Cassette systems can suit larger rooms, high ceilings or homes where wall space is limited.
• Correct sizing, zoning, inverter technology, clean filters and regular servicing can all help improve comfort and energy efficiency.

What are the main types of air conditioning systems?

There are four main types of air conditioning systems suited to Perth homes: reverse cycle ducted, split system, evaporative cooling and cassette. Each works differently depending on your home layout, room size and comfort needs. 

1. Reverse cycle ducted air conditioning

Reverse cycle ducted air conditioning is the smart choice for heating and cooling an entire home. It runs through ceiling ducts and can be zoned to control different rooms independently. 

2. Split system air conditioning

Split system air conditioning is the most practical choice for a single room or smaller area. It uses one indoor and one outdoor unit to heat or cool a specific space like a bedroom, living room or home office. 

3. Evaporative cooling

Evaporative cooling works best in Perth homes with open-plan layouts and good natural airflow. It draws in fresh outside air through water-soaked pads and performs most effectively in dry conditions. 

4. Cassette air conditioning systems

Cassette systems are the popular option for large rooms, high ceilings or homes where wall space is limited. They are installed in the ceiling and distribute air evenly from above. 

*This table compares the key characteristics of each air conditioning system.

Which air conditioning system is best for your home?

The best air conditioning system depends on your home size, layout and how many rooms need regular comfort. Matching the system to how your home is actually used gives better results than choosing by brand or popularity alone.  With over 8 years servicing different air conditioning systems across Perth homes, Smartfix has found that the best results usually come from matching the system type to the room size, layout, airflow and daily usage. 

1. Small homes : Split systems are often a practical choice for small homes because they can heat or cool the main living area without needing ductwork. If more than one room needs comfort, multiple split systems or a small ducted system may be considered.
2. Medium-sized homes: Medium-sized homes may suit either split systems or ducted reverse cycle air conditioning. The better option depends on how many rooms you use daily and whether you want whole home comfort or targeted room control.
3. Large homes: Large homes often benefit from ducted reverse cycle air conditioning because it can service multiple rooms through one system. Zoning is important so you can control different parts of the home more efficiently.
4. Open-plan homes: Open plan homes may suit ducted systems, larger split systems, cassette systems or evaporative cooling, depending on the ceiling height, airflow and how much of the space needs conditioning.
5. Bedrooms: Split systems are commonly used in bedrooms because they provide targeted comfort and many modern units are designed for quiet operation. Placement matters because the unit should cool or heat the room without creating uncomfortable direct airflow. Many Perth homeowners ask which air conditioning option is quietest for a bedroom. Most modern split systems have a sleep or quiet mode, and some units are specifically rated for low noise — checking the decibel rating before choosing a unit is worth doing.
6. High-ceiling rooms:  High-ceiling rooms may need more careful system selection because warm air rises and the space may require stronger airflow. Cassette systems, ducted outlets or correctly sized split systems may be considered depending on the room layout.

Not sure which air conditioning system suits your home?
Smartfix can assess your room size, layout, airflow and comfort needs, then recommend a suitable system for your Perth home.

Ducted vs split system air conditioning: which is better?

Ducted and split system air conditioning are two of the most common choices for Perth homes. The better option depends on whether you want whole home comfort or room by room control.

Ducted suits whole-home comfort

Ducted is the better choice if you want consistent heating and cooling across multiple rooms. The indoor components sit in the ceiling, keeping the system discreet, and zoning lets you control different areas separately.  It is often suited to families, larger homes and homeowners who want zoning across bedrooms, living areas and shared spaces.

Split systems suit single rooms

Split systems are the better choice if you need comfort in one room or a smaller area. They are commonly used in bedrooms, living rooms and home offices, and can also give separate room control without a full ducted installation.  They can also be useful when you want separate control in different rooms without installing a full ducted system.

Common air conditioning brands in Australia 

When choosing an air conditioning system, the brand should match the system type, room size, installation needs and long-term servicing support. Smartfix can help Perth homeowners compare common air conditioning brands based on how well they suit the home, not just brand name alone. 

• Mitsubishi Heavy Industries: MHI is known for reliable performance, strong cooling capacity and a wide range of split system and ducted air conditioning options for Australian homes.
• Daikin: Daikin offers a broad range of split and ducted air conditioning systems, making it suitable for everything from single bedrooms to whole-home installations.
• Samsung: Samsung is known for modern design, smart control features and app-based operation, making it suitable for homeowners who want connected air conditioning features.
• Panasonic: Panasonic offers energy-efficient split system and ducted air conditioning options, with a focus on comfort, reliability and quiet operation.
• Fujitsu General: Fujitsu General is a trusted option for consistent cooling and heating performance, with a strong split system range suited to Perth homes.

Other brands: Smartfix can also help with a range of other air conditioning brands depending on your home, system type and installation needs.

How Perth’s climate affects your air conditioning choice

Perth’s hot dry summers, coastal conditions and strong afternoon sun all affect which system will perform best in your home. Choosing without accounting for local climate can mean the system works harder than it needs to. 

1. Dry summer heat: Perth’s dry summers can make evaporative cooling suitable for some homes, while split and ducted reverse cycle systems offer more controlled cooling. 
2. Coastal humidity: Coastal homes may need extra care with outdoor unit placement, humidity and salt exposure. 
3. West-facing rooms: Afternoon sun can make west-facing rooms hotter, so sizing, shading and zoning matter. 
4. Large windows: Big windows can increase heat gain and affect system size. 
5. Insulation: Good insulation helps your system hold the right temperature. 
6. Ceiling height: Higher ceilings increase the air volume that needs heating or cooling. 

Why air conditioner sizing matters

Getting the size right is just as important as choosing the right system type. A unit that is too small will struggle in Perth’s heat, and a unit that is too large will cycle on and off inefficiently.  When Smartfix assesses a home, the team considers practical factors such as room size, ceiling height, insulation, window exposure and how the space is used before recommending a suitable option.

Key sizing factors include:

• Room size: Larger rooms usually need more cooling or heating capacity than smaller rooms.
• Ceiling height: Higher ceilings increase the volume of air that needs to be conditioned.
• Insulation: Insulated homes usually hold temperature better than poorly insulated homes.
• Window exposure: Large or unshaded windows can increase heat gain.
• Sun direction: Rooms that receive strong afternoon sun may need more careful planning.
• How the room is used: A bedroom, home office and open plan living area may all need different comfort settings.

What makes an air conditioner more energy-efficient?

Energy-efficiency depends on correct sizing, good installation and regular maintenance — not just the brand or star rating on the box. A well-matched and well-maintained system uses less energy and lasts longer.  Important efficiency factors include:

• Correct system sizing: A correctly sized system is less likely to work harder than needed.
• Zoning: Zoning can help reduce unnecessary heating or cooling in rooms that are not being used.
• Inverter technology: Inverter systems can adjust output to maintain comfort more smoothly instead of constantly switching fully on and off.
• Clean filters: Clean filters support better airflow and help the system operate properly.
• Regular servicing: Regular servicing helps identify airflow issues, dirt build up and small faults before they affect performance.
• Efficient temperature settings: Steady, sensible temperature settings can help reduce unnecessary strain on the system.
• Eco-friendly operation: A well-matched and maintained system can reduce wasted energy and support more efficient long-term performance. 

What to consider before you choose

Before choosing an air conditioning system, think about how you live in the home and what you need the system to do.

• How many rooms need cooling or heating?
• Is energy efficiency a priority?
• Do you want heating as well as cooling? 
• Are you renovating, or is this a retrofit? 
• How important is quiet operation or aesthetics? 
• Do you want smart home integration? 

If you are not sure which option suits your home, or your property needs extra care because of layout, access, insulation or existing system issues, Smartfix can help. With over 8 years of experience across different air conditioning systems in Perth homes, our team can assess your space and give practical advice based on your home, usage and comfort goals. 

Why choose Smartfix for air conditioning in Perth?

Smartfix is a Perth-based air conditioning team with over 8 years of local experience, a lifetime workmanship guarantee and 4.7 stars across 4,000+ Google reviews. We help homeowners choose the right system based on their home, not just the most popular option. 

Smartfix makes the process easier with:

• Expert air conditioning advice: Our team can compare split, ducted, evaporative and cassette systems based on your home and how each room is used.
• No call out fee and free quotes: You can get clear advice before deciding what work should go ahead. 
• Comprehensive service support: Smartfix can help with air conditioning advice, installation, servicing and replacement, so you do not need to manage multiple providers.
• Clear recommendations: We explain the best options for your home before work begins, so you can make a confident decision.
• Lifetime workmanship guarantee: All Smartfix workmanship is backed by a lifetime workmanship guarantee, giving you extra peace of mind. 

If you are not sure which system is right for your home, Smartfix can inspect your space and explain the best options clearly before work begins.

Written by Finley Dearlove, Head of Installers at Team Smartfix, with over 8 years of hands-on electrical service experience supporting Smartfix residential work across Perth.

FAQs

What type of air conditioner is best for a Perth home?

The best air conditioner for a Perth home depends on size, layout, insulation and how many rooms need comfort. Split systems suit single rooms, ducted suits whole homes, evaporative cooling suits dry open-plan homes, and cassette systems suit larger spaces. 

Is ducted or split system air conditioning better?

Ducted air conditioning is better for whole home comfort across multiple rooms. Split system air conditioning is better for single rooms, smaller spaces or homeowners who want targeted room by room control.

Does evaporative cooling work well in Perth?

Evaporative cooling can work well in Perth because the climate is often dry during summer. It is usually best suited to homes with good airflow and open plan layouts. It may be less effective during humid conditions or in homes where airflow is restricted.

How do I choose the right size air conditioner?

The right air conditioner size depends on room size, ceiling height, insulation, window exposure, sun direction and how the space is used. A professional assessment helps avoid choosing a system that is too small or too large for the home.

What is inverter technology in air conditioning?

Inverter technology allows an air conditioner to adjust its output instead of constantly switching fully on and off. This can help maintain a more consistent temperature and may support better efficiency when the system is correctly sized and installed.

What is the quietest air conditioning option for bedrooms?

Split systems are commonly used in bedrooms because they provide targeted comfort and many modern units are designed for quiet operation. The quietest result depends on the unit selected, where it is installed and how the airflow is directed.