23/05/2026
Common Air Conditioning Terminology Explained
Shopping for air conditioning or speaking with an air conditioning technician can sometimes feel like listening to a whole new language.
Terms like ducted, reverse cycle, zoning and inverter technology are often used without much explanation, leaving some homeowners unsure if they are making the right decisions.
To help you feel more confident, we have broken down some of the most common air conditioning terms you are likely to hear and explained them in simple, everyday language.
Reverse Cycle Air Conditioning
Reverse cycle air conditioning means your system can both cool and heat your home.
During summer, the system removes heat from inside your home and releases it outside.
In winter, the process is reversed, drawing heat from the outside air and transferring it indoors, even when the air feels cold.
This makes reverse cycle systems an efficient all‑in‑one solution for year‑round comfort and the most popular air conditioning option in Australian homes.”
Ducted Air Conditioning
A ducted air conditioning system uses a central unit connected to a network of ducts hidden in the ceiling.
Conditioned air is delivered through ducts (essentially vents) into each room, providing consistent comfort throughout the home.
Ducted air conditioning is ideal for whole‑home temperature control and offers a clean appearance, the ability to heat or cool multiple rooms at the same time, and access to advanced features such as zoning and smart controls.
Because the system is installed into the structure of the home, ducted air conditioning is commonly planned during new builds or major renovations, although it can also be added to existing homes.
Split System Air Conditioning
A split system air conditioner consists of two main components: an indoor wall‑mounted unit and an outdoor unit. Hence the term ‘split’.
Split systems are commonly used to heat or cool individual rooms such as bedrooms, living areas or home offices. They are a fantastic cost‑effective option, quick to install, and well suited to homes where whole‑home ducted air conditioning is not required.
Inverter Technology
Inverter technology allows an air conditioning system to adjust its power output based on how much heating or cooling is required.
Instead of constantly switching on and off, an inverter system operates steadily by increasing or decreasing its speed as needed. This results in more stable indoor temperatures, lower energy consumption, quieter operation, and reduced wear on system components.
Most modern air conditioning systems now use inverter technology as standard.
HVAC
HVAC stands for Heating, Ventilation and Air Conditioning.
It is a broad term used to describe systems that manage indoor comfort by controlling temperature, airflow and air quality.
In Australian homes, HVAC most commonly refers to reverse cycle air conditioning systems that provide both heating in winter and cooling in summer.
Zoning
Zoning allows you to control which areas of your home receive heating or cooling.
With a zoned ducted system, you can choose to condition only the rooms you are using, set different temperatures for different parts of the home, and improve overall efficiency while reducing energy costs.
For example, you may cool living areas during the day and only heat bedrooms at night, without wasting energy on unused spaces.
Thermostat and Controller
The thermostat or controller is the main interface for operating your air conditioning system. It allows you to set your desired temperature, turn the system on or off, schedule operating times, and control zoning where applicable.
Modern controllers can be wall‑mounted, hand-held or app‑based, providing greater flexibility, convenience and control over your home comfort.
Zoning Percentages on Control Panels
Many modern ducted air conditioning systems display zoning percentages on the control panel or mobile app.
These percentages show how much airflow is being delivered to each zone within the home.
For example, a living area may receive one hundred percent airflow, bedrooms may be set to fifty percent, and unused rooms may be turned off completely.
This level of control improves comfort and helps reduce running costs by avoiding unnecessary heating or cooling.
The percentage change visible on the controller (either 5% or 10%) changes the movement of the zone damper motor, this opens and closes an internal arm so that you can set to the desired temperature to control the airflow into that room.
Spill Zone
Zoning also has what is known as a ‘spill zone’. These are not as visible these days as modern controllers automatically open a zone motor to allow air to escape if the air conditioner is running but too few zones are open.
If there aren’t enough zone motors open, damage can occur to the indoor unit and other components due to air pressure. Hence, a spill zone can be manually configured during commissioning or automatically set by the controller.
Filters and Return Air Filters
Filters sit behind the return air grille and capture dust, allergens and debris before air enters the system.
Keeping filters clean improves indoor air quality, protects sensitive internal components, and helps reduce energy consumption.
Filters should be checked every few months and cleaned or replaced as required, particularly in homes with pets or high dust levels.
Return Air Grille and Vents
The return air grille is the point where air is drawn back into the system to be reheated or recooled.
Its placement is important, as it should be centrally located, have sufficient clearance, and be kept clean at all times.
A blocked or dirty return air grille can restrict airflow and force the system to work harder than necessary, reducing efficiency and performance.
Servicing
Servicing, much like you would expect, is the regular professional maintenance of your air conditioner, by an air conditioning professional. Just like you would do with your car.
Regular servicing is essential to keep your air conditioning system running safely and efficiently.
A professional service typically includes cleaning filters and internal components, checking refrigerant gas levels, inspecting electrical connections, and confirming correct airflow and drainage.
Routine servicing helps extend the life of the system and reduces the risk of unexpected breakdowns during peak heating or cooling periods.
Builders Direct at Ford & Doonan
Builders Direct is Ford & Doonan’s specialised service designed for new homes and residential developments. This service allows air conditioning systems to be planned and designed alongside the construction process rather than being added later.
Planning early results in cleaner and more efficient duct layouts, correctly sized equipment, seamless integration with house plans, and fewer compromises once construction is complete.
By working directly with builders, Ford and Doonan ensures each air conditioning system is designed correctly from the very beginning.
Air Diverters
Air diverters are installed on the outdoor unit of an air conditioning system to redirect expelled air upwards and away from nearby obstructions such as fences, walls or buildings.
Ford & Doonan air diverters are designed to direct airflow at a forty‑five degree angle, preventing hot air in summer or cool air in winter from being drawn back into the unit.
When an outdoor unit is positioned too close to an obstruction, like a fence or a tree, recirculating air can cause the system to work harder, increase running costs and accelerate wear and tear.
Installing an air diverter improves efficiency by allowing the unit to draw in clean ambient air, helping extend the lifespan of the system and improve indoor comfort.
Running Costs
Running costs refer to how much it costs to operate your air conditioning system over time. These costs are influenced by the size and efficiency of the system, the level of insulation in your home, zoning and temperature settings, and how often the system is used.
An efficient, well‑designed system that is correctly sized for your home will generally cost less to run in the long term.
System Capacity (kW)
Australian air conditioners are rated in kilowatts (kW), which indicate how much heating or cooling power the system can provide. Choosing the correct capacity is essential for performance and efficiency.
A system that is too small may struggle to maintain temperature and run continuously, while a system that is too large may cycle on and off frequently, reducing efficiency.
A professional assessment ensures the system is properly sized for your home’s layout, insulation and usage needs.
Drain Alarm and Drip Tray
When an air conditioning system cools the air, moisture is removed and collected in a drip tray before being channelled away through a drain line.
A drain alarm monitors this process and alerts you if there is a blockage or overflow. If activated, the system usually shuts down to prevent water damage, which is an important safety feature for ceiling‑installed ducted systems.
Anti Vibration Mounts
The main unit of a ducted air conditioning system is installed on anti-vibration mounts to reduce movement, noise and vibration caused by the compressor during operation. These mounts help minimise noise transmission into the home, protect surrounding surfaces and improve the long‑term durability of the system.
While small, they play an important role in overall comfort.
Threaded Rod
In ducted air conditioning installations, threaded rod is used to securely suspend the indoor unit from the roof structure, rather than sitting the unit directly on the ceiling floor.
Correct installation ensures the unit remains level, prevents unnecessary vibration, and meets safety and building standards.
Professional installers use high‑quality fixing methods to ensure the unit remains stable and secure throughout the life of the system.
Understanding Makes Better Comfort Choices
Understanding air conditioning terminology helps you make informed decisions, ask the right questions and choose a system that truly suits your home and lifestyle.
Whether you are building, renovating or upgrading an existing system, knowing the basics helps ensure long‑term comfort, efficiency and value.
Knowing your air conditioning info is the first step to better comfort. To learn more about systems, servicing or new home solutions, speak with the experts at Ford & Doonan or visit our website to discover how we can help.
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