How Does a Ductless Air Conditioner Work?

How Does a Ductless Air Conditioner Work?

Mini-split systems or ductless air conditioners have been changing the trend of air conditioning systems in our contemporary society. Unlike most regular central air conditioning systems that use ducts to circulate the cooled air, ductless AC systems do not require ducts. These are small and all-around systems: the external inverter compressor and one or more internal AHU units are connected through refrigerant tubes or electrical wiring.

Here, we will find out what ductless air conditioners are, their components, and how a ductless air conditioner works. Along with understanding the basic details, we will also reveal the advantages that may be gained with ductless AC, hence, you will be able to make the right choice regarding your cooling needs.

What is a Ductless Air Conditioner?

A ductless air conditioner is a type of air conditioning system that cools selected areas without the necessity of ducts, also known as mini-split systems. Ductless air conditioners are very portable and can be used for both residential and commercial purposes and in instances where it is impossible to integrate ductwork.

Ductless systems have several benefits as compared to conventional air conditions. One of the biggest differences is that they are much more relaxed regarding the zoning of buildings. Moreover, ductless air conditioners are marginally more efficient than traditional AC systems since they do not have losses through ducts. In short, ductless air conditioners offer a sleek and effective means of creating a comfortable indoor climate without the limitations of ducted systems.

Components of a Ductless Air Conditioner

Indoor Unit

  • The indoor components of a ductless air conditioner are commonly referred to as the evaporator or air handler, which can be either mounted on a wall or the ceiling of the room meant to be cooled.
  • Its main role is to take heat from inside air conditioning and release it to the outdoor unit.
  • In this unit, the evaporator coil is responsible for cooling the air by absorbing heat and moisture. It is then circulated back into the room via the fan and produces a consistent and comfortable cool without requiring ducting.

Outdoor Unit

  • The outside unit, which is also known as the condenser or the compressor, is often located outside the premises or in another area.
  • It compliments the indoor unit in achieving the objective of cooling the room. The external components are the compressor, condenser coil, and fan.
  • Its main use is to expel the heat that is generated in the indoor air to the outside environment.
  • Here, suppose the refrigerant has collected heat from the indoor unit. In that case, the refrigerant is directed to the outdoor unit, where the compressor elevates the pressure and the heat before returning it to the condenser coil.
  • The fan then throws air over the coil, thus expelling the heat out of the building to the outside environment.

Refrigerant Lines

  • One of the most important components of the ductless air conditioning system is refrigerant lines that connect the indoor and outdoor units to allow refrigerant to move between these parts.
  • These lines are normally made from copper tubing and contain the refrigerant gas at a certain pressure.
  • The refrigerant is in a closed-loop system where it alternates between liquid and gaseous forms to cool and thaw various substances.
  • It also helps in providing a continuous flow of refrigerant through the refrigerated lines and thus helps cool and dehumidify the indoor air.
  • Proper installation of these lines, together with the correct insulation system, is crucial in enhancing performance and energy efficiency.

Remote Control/Smart Controls

  • Most new-generation ductless air conditioners are often coupled with a remote control or smart control, which makes it easy for users to control the devices conveniently.
  • A remote control allows the user to select the temperature, rate of airflow, and mode of operation from a position across the room.
  • Some models also have additional features like programmable timers, the ability to switch off automatically at night, and energy-saving modes.
  • Smart controls enhance convenience further by enabling users to control their ductless air conditioners on their smartphones or through voice commands.
  • These smart features improve the usability of the building, regulate the optimal use of energy resources, and provide a comfortable and comfortable climate throughout the year.

How Does a Ductless Air Conditioner Work?

A ductless air conditioner, sometimes referred to as a mini-split system, works similarly to a central air conditioning system, but they do not require ducts. It consists of two main components: the indoor unit and the outdoor unit.

  • When the air conditioner is switched on, the indoor unit fan suctions warm air from the room through the indoor unit.
  • When the warm air flows across the evaporator coil, the refrigerant gases take heat from the air, thereby expanding and evaporating into lower-pressure gas.
  • The refrigerant, which has changed its state to a gas, now moves through a series of refrigerant lines to the outside unit.
  • The refrigerant gas in the outdoor unit is compressed by a compressor and the temperature and pressure increase.
  • Ductless air conditioners are different from central air conditioning systems that require duct systems for the distribution of cooled air throughout the building.
  • The individual indoor unit is connected to the outdoor unit through refrigerant pipework, electrical wiring, and drainage.
  • The great thing with individual control of each indoor unit is that occupants can set the temperature and the comfort level of the building depending on the areas they’re in.

Therefore, a ductless system operates by trapping heat inside the indoor air, then expelling it out, and at the same time circulating cool air in the interiors using air handlers. This practical and flexible process provides convenience and conserves energy for home and commercial applications.


All in all, splitting air conditioning systems is a flexible and energy-saving means of cooling premises. Through the functions of removing the duct system and offering zonal cooling abilities, ductless systems offer accurate comfort while cutting costs. The ability to quickly cool the desired area and the availability of such options as a remote control and smart controls make ductless air conditioners one of the most sought-after solutions for maintaining the optimal climate.

Curious about how ductless air conditioning can enhance your home comfort? At infiniti Home Comfort, we specialize in the installation, maintenance, and repair of ductless air conditioning systems. With skilled professionals and technical expertise, we ensure top-quality service, helping you stay cool during the hot seasons. Explore our ductless air conditioning services to learn more about how we can meet your HVAC needs.


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