Air Conditioning Glossary – A Comprehensive Guide


Welcome to our comprehensive air conditioning glossary, where we aim to provide you with a detailed understanding of the terminology and concepts related to air conditioning systems. Whether you’re a homeowner looking to upgrade your cooling system or an HVAC professional seeking to enhance your knowledge, this guide will equip you with the essential information to make informed decisions. Let’s dive in!

1. Air Conditioning

Air conditioning is the process of controlling and regulating indoor temperature, humidity, and air quality to create a comfortable and healthy living environment. It involves the circulation, cooling, dehumidification, and filtration of air within a designated space.

2. BTU (British Thermal Unit)

British Thermal Unit (BTU) is a measurement unit used to quantify the amount of heat energy required to raise or lower the temperature of a substance. In the context of air conditioning, it represents the cooling capacity or heat removal capability of an AC system. The higher the BTU rating, the more cooling power the unit can provide.

3. SEER (Seasonal Energy Efficiency Ratio)

SEER is a rating system that measures the energy efficiency of an air conditioner or heat pump. It calculates the cooling output (in BTUs) divided by the energy input (in watt-hours) over an entire cooling season. A higher SEER rating indicates a more efficient unit, resulting in lower energy consumption and reduced utility bills.

4. HVAC (Heating, Ventilation, and Air Conditioning)

HVAC refers to the technology and systems used for indoor environmental comfort. It encompasses heating, cooling, ventilation, and air quality control. HVAC systems are designed to maintain desirable temperature, humidity, and air circulation in residential, commercial, and industrial settings.

5. Compressor

The compressor is a vital component of an air conditioning system. It is responsible for compressing the refrigerant gas, raising its pressure and temperature. By increasing the refrigerant’s pressure, the compressor allows for efficient heat transfer and cooling.

6. Evaporator Coil

The evaporator coil is located inside the indoor unit of a split air conditioning system. It works by absorbing heat from the indoor air and evaporating the refrigerant, which is then transported to the condenser coil for release. The cooled air is subsequently circulated back into the room.

7. Condenser Coil

The condenser coil is located in the outdoor unit of a split air conditioning system. It receives the high-pressure, high-temperature refrigerant vapor from the compressor and condenses it back into a liquid state by releasing heat to the outdoor air. This process allows for efficient heat dissipation.

8. Refrigerant

Refrigerant is a substance used in air conditioning systems to transfer heat between indoor and outdoor environments. It undergoes phase changes from a low-pressure gas to a high-pressure liquid and vice versa, absorbing and releasing heat in the process. Commonly used refrigerants include R-32, R-410A and R-22.

9. Ductwork

Ductwork refers to the system of pipes or channels used to distribute conditioned air throughout a building. It plays a crucial role in delivering cool air from the air conditioner to different rooms and spaces. Well-designed and properly sealed ductwork ensures efficient airflow and minimizes energy loss.

10. Zoning

Zoning allows for personalized temperature control in different areas or zones of a building. By utilizing multiple thermostats and dampers, each zone can be individually regulated to maintain desired comfort levels. Zoning systems optimize energy usage by directing conditioned air only to occupied areas.

11. Thermostat

A thermostat is a device that controls the operation of an air conditioning system by sensing and maintaining the desired temperature. Modern thermostats often feature programmable settings, Wi-Fi connectivity, and smart home integration, allowing for enhanced comfort and energy efficiency.


In conclusion, this comprehensive air conditioning glossary provides an in-depth understanding of the terminology and concepts associated with air conditioning systems. By familiarizing yourself with these key terms, you’ll be better equipped to make informed decisions about your cooling needs, choose the right equipment, and optimize energy efficiency. Remember, maintaining a comfortable indoor environment is not only about temperature control but also about air quality and energy conservation.

Get Help From The Professionals

Nazran Air Conditioning is trusted for AC repairĀ  services throughout Malaysia. We can also help improve system efficiency and provide comprehensive maintenance plans to keep your air conditioning system running year after year. To learn more, Whatsapp us now at 012-2468 145.