All trades have their own set of terms and jargon that may sound like gibberish to the average consumer. The world of AC is sadly, no different. When it comes to buying, installing and repairing an air conditioner, there is some terminology that you may hear cropping up again and again. Instead of having to nod your head confused, as a repairman unloads these new terms, we thought we’d cover some of the basics for you in our air conditioning glossary. This way, you should be able to make more informed decisions regarding your AC needs.

From ARC to zoning, this air conditioning glossary will cover some of the key terminologies you might encounter in the world of AC.

Here’s our air conditioning glossary of trade-specific terms you should know:

AIRCON FILTER: Filters are an important component of your AC system. They are usually made of a fine material like pleated paper or cloth stretched across a sturdy frame. Their function is to filter the air that passes in and out of your HVAC system. They collect small particles of contaminants that may affect the health and wellbeing of you, your family or your employees, including dust, dirt, pollen, mould, lint and other fibres, bacteria, hair or animal fur, and particles of wood, metal or plastics.

ARC: This is the Australian Refrigeration Council, the ‘peak industry body’ for refrigeration and air con. They provide leadership and knowledge to the climate control industry through licensing and regulatory assistance, technical advice, promoting training quality, connecting customers to ARC-licensed businesses and providing free promotional materials for ARC-licensed businesses.

ARCTICK: The ARCTICK license must be held by any person who carries out work with refrigeration and AC (RAC) equipment. Handling fluorocarbon refrigerant without a Refrigerant Handling Licence is an offence. You should only hire an AC specialist with an ARCTICK license.

COMMISSIONING: Air con commissioning is the process of inspecting a new unit after installation, making sure it is running perfectly.

DUCT: Ducts are the passages used in heating, ventilation, and air conditioning that deliver and remove air. They are used in ducted systems.

DUCTED SYSTEM: Ducted air conditioners are installed internally, often within the roof. From a central unit, a series of ducts will cool or heat individual rooms. This type of air conditioner will require a certain amount of cavity space for installation, so may not be suited to every home. They are more suitable for commercial or industrial facilities.

INDOOR UNIT: The indoor unit is located inside. It is the part that blows hot or cold air into a room. It contains the heat exchange coil, filters, remote receiver and fan.

HEATING OR COOLING CAPACITY: This is the amount of heating/cooling the unit can produce.

HVAC: This stands for heating, ventilating, and air conditioning – a trio of functions that, as a whole, control thermal comfort and air quality in a building. It is basically a blanket term encapsulating everything from a split AC unit for a house, to a large ducted air conditioning and ventilation system for an industrial complex or skyscraper.

MULTI-SPLIT SYSTEM: This system comprises of one outdoor unit which is connected to multiple indoor units. There are numerous benefits to a multi-split air conditioning unit. They are extremely efficient and capable of powering up to six interior rooms at once. With this system, each indoor unit can be controlled individually. This means that specific rooms can be set at different temperatures, all from a remote.

OUTDOOR UNIT: The outdoor unit is the external part of the AC system, which contains the compressor, fan, and heat exchange coil, and pumps refrigerant to and from the indoor unit where it is heated and cooled.

REFRIGERANT: Refrigerant is the substance that ‘conditions’ the air it blows. Without refrigerant, air conditioners, fridges or freezers wouldn’t exist. It is a compound, either fluid or gas, that creates hot and cold air when combined with components like compressors and evaporators.

Some kinds of refrigerants are outdated, such as R12 or R22. These substances are older and are known to contribute to the greenhouse gas effect. The R22 started being phased out in 2010 and R12 was phased out in the 1990s. Hydrofluorocarbons (HFCs) like R410A and R134 is the standard today.

REGASSING: Although relatively uncommon, regassing is one of the key processes involved with air conditioning maintenance and repairs. If installed correctly, an air-con unit should not usually have to be regassed. However, older units, or those that weren’t installed by a professional installer, may need to be assessed and serviced. This involves checking for refrigerant leaks, fixing a leak if present, and replacing refrigerant if required.

SPLIT SYSTEM: Split systems are prevalent in homes all sizes. This type of air con refers to a system where the condenser is fixed externally outside the home, and the head unit is fixed inside the home.

THERMOSTAT: The device that controls the climate of a room by relaying information to the AC unit.

ZONING: The process of controlling the climate of separate rooms in a building. Older air conditioners could only be set to a single temperature. However, modern technology allows us to now control the temperature in separate rooms with a single unit.

If you’re looking for an aircon installation quote, or for someone to repair or maintain your system, please don’t hesitate to get in touch today. Our operations span the greater metro area, including the Eastern Suburbs, Lower North Shore and South West. We always respond quickly and aim to be on-site as soon as possible. With over 10 years of experience under our belt, we pride ourselves on providing the highest quality of fast and efficient service.

Now that you’re in the know with AC terms, check out some more tips below:

Understanding the Energy Star Rating when buying an air conditioner

Regassing Your Air Conditioning Unit: A complete guide

Our Guide to Air Conditioning Service and Maintenance