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  • Writer's pictureSofia Fadzil

Everything You Need to Know About Split System Air Conditioner

Updated: May 6

split system air conditioner

Split unit HVAC systems, also known as split air conditioners, are a popular choice for residential and commercial cooling and heating needs.

Consisting of indoor and outdoor units, these systems offer flexibility, energy efficiency, and noise-free operation.

In this article, it will guide you with everything you need to know about split unit HVAC systems.

Components of a Split Unit HVAC System:              

Indoor Unit

The indoor unit contains the evaporator coil, blower fan, and air filter. It is typically installed indoors and is responsible for cooling or heating the air before circulating it throughout the  space.

Outdoor Unit

Positioned outside the building, the outdoor unit houses the compressor, condenser coil, and fan. It dissipates the heat absorbed  from the indoor air, allowing the refrigerant to cool down and circulate back into the indoor unit.


how split unit hvac work


How does a Split Unit HVAC System Work?

A split system air conditioner works by using refrigerant to absorb heat from indoor air and release it outdoors, resulting in cooler air circulated indoors.

Here's a how split system works:

Air Circulation

The process begins with the indoor unit, which contains a fan.

This fan pulls warm indoor air from the room and blows it over the evaporator coil.

Heat Absorption

The evaporator coil contains refrigerant, a chemical with properties that allow it to change states between liquid and gas at low temperatures. As the warm indoor air passes over the cold evaporator coil, the refrigerant absorbs heat from the air, cooling it down.    


Refrigerant Circulation

The now warmed refrigerant vaporizes into a gas as it absorbs heat from the indoor air. It then travels through a copper tubing to the outdoor unit.

Heat Dissipation

In the outdoor unit, the compressor pressurizes the refrigerant gas, raising its temperature. The hot refrigerant gas then passes through the condenser coil, where it releases the absorbed heat into the outdoor air. 

Cooling Process

As the refrigerant releases heat outdoors, it condenses   back into a liquid state. It then flows back indoors through the refrigerant lines, ready to absorb more heat from the indoor air. 

Air Distribution

The now cooled indoor air is blown back into the room by the indoor unit's fan, creating a comfortable indoor temperature.

This continuous cycle of absorbing heat indoors, transferring it outdoors, and circulating cooled air indoors repeats as needed to maintain the desired temperature.

This is a process used by a split system for cooling. For the heating process, a split system with a heat pump can reverse the flow of refrigerant, allowing it to absorb heat from outdoor air (even in cold weather) and release it indoors, providing warmth.

This feature makes split systems versatile for both cooling and heating needs.


Pros and Cons of Split HVAC Unit



Efficient cooling and heating

Installation cost can be high

Quieter operation compared to window units

Requires regular maintenance and servicing

Better air quality due to separate indoor and outdoor units

Outdoor unit can be vulnerable to weather condition

More visually pleasing, with indoor unit typically mounted high on wall or ceiling

Requires adequate space for outdoor unit installation

Can increase property value

May require additional equipment for multiple zones

In a nutshell, split unit HVAC systems offer efficient, quiet, and customizable cooling and heating solutions for any spaces required. With their design, energy efficiency, and flexibility, they have become a popular choice for many users.

TCW Group, as a one stop HVAC manufacturer based in Malaysia, able to provide services starting from design of the units based on customized applications, up to manufacturing and complete unit assembly.

Shall you have any inquiries, feel free to reach us at

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