Air Conditioning Terminology From A to Z

Your A to Z’s

Have you heard your air conditioner repairman use terms that didn’t make sense to you? Or are you getting a new aircon system installed and the technician is using words you’ve never heard of before?

Making informed purchasing decisions and getting the most from your home or office cooling system is easier when you understand basic air conditioning terminology.

We’ve compiled a glossary of the most commonly used terms for your reference.

Aircon Filter

Filters are one of the most important components of your AC system. Filters are made of a fine material such as pleated paper or cloth stretched across a frame. Their purpose is to purify the air that passes in and out of your air conditioner, collecting any dust, dirt, or pollen, etc.

ARC (Australian Refrigeration Council)

The responsible body for permitting refrigeration handling licenses to approved Australian technicians.


The service conducted by the technician following an AC installation to ensure all equipment is functioning properly.


The outdoor portion of an AC or heat pump that either releases or collects heat, depending on whether you are using the heating or cooling function of your system.


Tubes that are used for HVAC (Heating, Ventilation and Air Conditioning) that assist in the process of supplying and removing air.

Ducted System

A Ducted System is installed internally, often within a roof. From a central unit, a number of ducts either cool or heat separate rooms.

This type of AC system requires a certain amount of space for installation, therefore making it more suitable for commercial spaces or larger homes.


Stands for Heating, Ventilation and Air Conditioning and is referring to the whole discipline of air conditioning.

Indoor Unit

The indoor unit is the machine that blows cold or hot air into a room and is located inside the property. It includes the filters, heat exchange coil, remote receiver, and fan.

Inverter Technology

Helps to gradually increase and decrease power. Inverter technology assists in achieving the desired room temperature, resulting in lower operating costs and continuous comfort without sudden fluctuations in temperature.

Outdoor Unit

Is the external part of an AC system, which contains the fan, heat exchange coil, compressor, and works by pumping refrigerant to and from the indoor unit where it is cooled or heated.


The substance or chemical that absorbs heat and creates cool air when run through the coils and other parts of an air conditioning system.

Split System

Split Systems are one of the more popular types of air conditioning systems used in homes – these systems have 2 units, one that’s on the inside and one that’s on the outside.

They are relatively simple to install and are recognised for being energy efficient and quiet.


A device used to control the temperature inside your space/home.


A process of controlling the climate of separate rooms in a building. Modern technologies allow the temperature to be controlled in individual rooms with one unit.

Now You Know the A to Z’s of Air Conditioning!

Central Coast Air Conditioning have been installing, supplying, and servicing Daikin and Fujitsu Air Conditioners across the Central Coast NSW since 1973. We are more than happy to offer more knowledge on air conditioning terminology and can provide hassle-free quotes for installation and service. For more information, contact Central Coast Air Conditioning for the right air conditioner suitable for your premises.

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