Centralised Air Conditioning Pros And Cons: What You Need To Know

If you’re looking and researching centralized aircon, then you’ve come to the right place.

In this article, we will take a look at the pros and cons of centralized air conditioning systems before you get one of these.

What is a Centralised Air Conditioning System?

Centralised air conditioning systems are a common solution for providing cool air to large buildings and commercial spaces.

These systems are especially important in hot climate countries like Malaysia, where temperatures can often soar to uncomfortable levels.

A centralised air conditioning system is a cooling system that uses a single unit to cool an entire building or a large area and is usually located in the central location of the premises.

The system is connected to a network of ducts that distribute the cool air throughout the building.

The basic components of a centralised air conditioning system include the compressor, evaporator, and condenser. The compressor is the heart of the system, and it is responsible for compressing the refrigerant gas.

The evaporator is where the refrigerant absorbs heat from the air, and the condenser is where the refrigerant releases the heat it has absorbed.

One of the advantages of a centralised air conditioning system is that it provides a consistent temperature throughout the building.

This is because the system is designed to distribute cool air evenly throughout the building, regardless of the layout or the number of rooms.

Another advantage is that it can be more energy-efficient than using multiple individual units, as it allows for centralised control and monitoring.

In Malaysia, where temperatures can often exceed 35°C (95°F) throughout the year, centralised air conditioning systems are an essential part of many buildings, including homes, offices, shopping malls, and other public spaces.

In addition to providing comfort, these systems also help to improve indoor air quality by filtering out pollutants and allergens.

Ducted and Ductless System

There are two main types of centralised air conditioning systems: ducted and ductless.

Ducted systems use a network of ducts to distribute cool air throughout the building, while ductless systems use individual units installed in each room or area.

Ducted systems are more commonly used in larger buildings, as they are more effective at cooling large areas.

However, ductless systems are often more energy-efficient, as they allow for individual temperature control in each room. Which some refer to as cassette aircon units.

One of the challenges of installing a centralised air conditioning system in Malaysia is the need to balance the cooling requirements with energy efficiency.

In order to achieve optimal efficiency, the system must be designed to match the cooling load of the building.

This means that the size and capacity of the system must be carefully calculated based on factors such as the building’s size, layout, and insulation.

Although we have an aircon HP calculator, it is not suitable to use in this case.

In addition to proper sizing, other factors that can affect the efficiency of a centralised air conditioning system in Malaysia include the quality of the installation, the maintenance of the system, and the type of refrigerant used.

Proper installation is essential to ensure that the system is operating at peak efficiency, while regular maintenance is necessary to prevent breakdowns and ensure that the system is running smoothly.

Choosing the right refrigerant is also important, as some refrigerants can have a negative impact on the environment.

In Malaysia, the most commonly used refrigerant in centralised air conditioning systems is R-410A, which is a hydrofluorocarbon (HFC) that does not contain ozone-depleting substances.

However, there is increasing concern over the environmental impact of HFCs, as they are potent greenhouse gases. As a result, there is growing interest in alternative refrigerants, such as hydrofluoroolefins (HFOs) and natural refrigerants like carbon dioxide (CO2) and ammonia (NH3).

Here’s a research paper that discussed these alternative options in industrial refrigerants. 

Why Choose One Over The Other?

So, which type of cooling system is right for you?

Ultimately, the decision comes down to a few factors.

If you have a large home or commercial building, then a centralized air conditioning system may be the best option. 

On another note, split-type air conditioning is flexible and more affordable.

It can be installed in any room of your house and is great for smaller spaces where central air conditioning is not possible or desired.

So, if you only need cooling in a few specific rooms, the split system might be the best option for you.

In conclusion, whichever type of cooling system you choose, make sure to read the pros and cons of each option before making a decision.

The Pros & Cons Of A Centralized Air Conditioner


  • Efficient cooling: A centralized air conditioning system is typically very efficient at cooling large areas.
  • Can be easily controlled from a central location: A centralized air conditioning system makes it easy to adjust the temperature in each room as needed.
  • Appearance: A centralized air conditioning system can be quite stylish and look nice in a room and is space-saving.


  • Can be expensive to install and maintain: A centralized air conditioning system can be expensive to install and maintain, but it is typically worth it due to its efficiency.
  • Can be quite loud: A centralized air conditioning system can be quite loud, which can be disruptive for some people.
  • Installation: A centralized air conditioning system can be a bit tricky to install, so be sure to hire a professional if you are not familiar with this type of installation. Learn all the aircon installation tips and tricks from us here.


Centralised air conditioning installation involves the use of a central unit that provides cool air to individual rooms or offices through a network of ducts.

These systems are designed to provide a consistently comfortable temperature throughout the building while consuming less energy than traditional HVAC units.

Centralised systems are ideal for large commercial spaces or buildings with multiple rooms as they can be easily controlled by a single thermostat.

Additionally, centralised systems provide better air quality as they can be fitted with filters that remove impurities from the air.

Proper installation and maintenance of centralised air conditioning systems can significantly reduce energy costs and improve the overall efficiency of the building.

These systems are designed for long-term use and require minimal upkeep, making them a cost-effective and convenient choice for building managers and occupants alike.

The installation process for central air conditioning varies depending on the specific system being installed, but generally follows these steps:

Firstly, ventilation ducts are installed throughout the building to distribute the cool air.
Then, the condenser unit is installed outside, which houses the compressor responsible for cooling the refrigerant.

Next, an air handler, or blower unit, is installed indoors. This unit contains the evaporator coil that absorbs heat from the indoor air, and a fan to circulate the cooled air through the ducts.
Finally, the refrigerant lines are connected to both the condenser unit and the air handler, completing the system.

Professional installation is recommended due to the complexity and potential dangers involved in handling refrigerant and electrical wiring.

Once installed, a centralised air conditioning system can provide efficient and reliable cooling for many years with proper maintenance.


Centralised air conditioning units are an essential aspect of any building, be it a commercial or residential structure.

These air conditioner systems provide a comfortable environment for the occupants and protect sensitive equipment from overheating or damage.

However, like any other mechanical system, central air-conditioning units require maintenance to function optimally and prevent breakdowns.

Importance of Maintaining centralised Air Conditioning Units

  1. Energy Efficiency: One of the primary benefits of maintaining centralised air conditioning units is increased energy efficiency. When the system is well-maintained, it operates more efficiently, which leads to lower energy consumption and reduced utility bills.
  2. Improved Indoor Air Quality: A well-maintained air conditioning unit ensures that the air circulating inside the building is clean and healthy. Regular cleaning and filter replacement can help eliminate airborne particles, bacteria, and allergens, which can cause health problems for building occupants.
  3. Extended Equipment Lifespan: Proper maintenance ensures that the central air conditioning system lasts for an extended period. Regular inspections and maintenance can identify potential issues before they become major problems, thus preventing costly repairs or replacements.
  4. Cost Savings: A well-maintained air conditioning unit is less likely to require expensive repairs or replacements, which can save building owners and managers money in the long run.

How to Maintain centralised Air Conditioning Units

  1. Schedule Regular Inspections: Regular inspections by a certified HVAC technician can identify potential problems before they turn into major issues. These inspections should be scheduled at least twice a year, preferably in the spring and fall.
  2. Change Filters: Dirty filters reduce the efficiency of the air conditioning system and can lead to poor indoor air quality. Filters should be changed every three months or more frequently if the building is located in a dusty or polluted area.
  3. Clean Evaporator and Condenser Coils: Dirt and debris can accumulate on the evaporator and condenser coils, reducing the efficiency of the air conditioning system. These coils should be cleaned at least once a year.
  4. Check Refrigerant Levels: Low refrigerant levels can cause the air conditioning system to operate inefficiently and may lead to expensive repairs. Refrigerant levels should be checked regularly, and any leaks should be repaired promptly.
  5. Clean Condensate Drain Lines: Over time, condensate drain lines can become clogged with dirt, algae, or other debris. A clogged drain line can cause water damage and lead to mold growth. These lines should be cleaned at least once a year.
  6. Maintain Proper Airflow: Proper airflow is essential for the efficient operation of the air conditioning system. Make sure that all vents and registers are unobstructed and that the air ducts are free from leaks or blockages.


In conclusion, regular maintenance of centralised air conditioning units is essential for their efficient operation and longevity. Building owners and managers should schedule regular inspections, change filters, clean coils and drain lines, check refrigerant levels, and maintain proper airflow to keep the system in top condition.

By investing in maintenance, building owners and managers can ensure that their air conditioning systems provide a comfortable and healthy indoor environment for occupants while reducing energy consumption and saving money in the long run.

Despite the challenges, centralised air conditioning systems are an essential part of modern buildings in hot climate countries like Malaysia.

These systems provide comfort, improve indoor air quality, and contribute to the overall energy efficiency of the building.

As technology advances and environmental concerns become more pressing, it is likely that we will see continued innovation in this field, with new refrigerants, more efficient systems, and smarter controls that optimize energy use and improve the user experience.

As you can see, there are many benefits to choosing a centralized air conditioning system over an HVAC unit.

If you’re in need of a new air conditioner, then we recommend that you contact one of our aircon experts today!