Ductless Air Conditioner – Everything You Need to Know

Published by 
Last updated: 
April 2, 2024

The Benefits of Ductless Air Conditioners: Why You Should Consider Making the Switch


Ductless air conditioners are gaining popularity in the United States, having been widely used in Europe and Southeast Asia for some time. These systems offer several advantages over conventional HVAC equipment, including lower costs and easier installation. In this article, we will explore the components, types, and functionality of ductless air conditioners, as well as the reasons why you should consider investing in one.

Main Components of a Ductless Air Conditioner

A ductless air conditioner consists of two main units: an outdoor unit and an indoor unit. The outdoor unit comprises three key components:

  1. Compressor: Transforms low-pressure gas into high-pressure gas, enabling effective heat transfer.
  2. Fan: Draws in indoor air full of heat energy and releases it outdoors.
  3. Condensing coil: Made of aluminum fins, this component cycles the hot refrigerant and converts it from a high-pressure gas to a high-pressure liquid.

The indoor unit contains a fan for airflow and an evaporator coil. The outdoor and indoor units are connected by line-sets, which are heat-insulated copper tubes that transfer the refrigerant.

How a Ductless Air Conditioner Works

Ductless air conditioners function similarly to traditional ducted systems, with the main difference being the absence of ductwork. The cooling process follows these steps:

  1. The compressor transforms low-pressure gas into high-pressure gas.
  2. The fan spreads the heat outdoors.
  3. The refrigerant is transformed into a high-pressure liquid, then a low-pressure liquid by the evaporator coil.
  4. The refrigerant absorbs indoor heat and turns it into cool air, which is spread indoors by an internal fan.
  5. The resulting low-pressure gas is pushed back to the compressor, and the cycle repeats.

Types of Ductless Air Conditioners

There are two main types of ductless air conditioners, designed to cater to different cooling needs:

  1. Mini split ductless air conditioner: Ideal for cooling a single room, this system has one outdoor condenser and one indoor fan coil. Multiple units can be installed in a building with several inhabitants, allowing each unit to set its own temperature independently.
  2. Multi split ductless air conditioner: This system has one outdoor condenser and multiple indoor air handlers. You can either have an indoor unit with a thermostat to activate cooling in all rooms when needed or a condensing unit with separate compressor circuits connected to each air handler, allowing you to control the temperature in specific areas.

Installation Flexibility

Ductless air conditioners are highly versatile and can be installed in various settings, including:

  • Attics
  • Basements
  • Garages
  • Condos
  • Server rooms
  • Bedrooms
  • Meeting rooms
  • Hospitals
  • Churches
  • Recording studios
  • Buildings with multiple tenants
  • Hotels
  • Data centers
  • Office buildings

The compact size and quiet operation of ductless air conditioners make them suitable for a wide range of applications.

Advantages of Ductless Air Conditioners


Ductless air conditioners are more cost-effective than traditional ducted systems. Their smaller size leads to lower power consumption, resulting in reduced electricity bills. Additionally, the absence of ducts allows for more efficient delivery of cool air directly into your home.

Improved Air Quality

Ductless air conditioners eliminate the need for periodic duct cleaning, as they do not rely on air ducts to distribute cool air. This reduces the presence of dust, allergens, and bacteria in your indoor air, leading to improved air quality.

Easy Installation and Effortless Maintenance

Installing a ductless air conditioner is a straightforward process that can often be completed in a single day, depending on the number of indoor and outdoor units required. Unlike traditional systems, ductless air conditioners do not necessitate extensive modifications to your home, such as rebuilding walls to accommodate ducts. A simple three-inch hole is all that is needed for installation.

Lower Carbon Footprint

Ductless air conditioners are more environmentally friendly than their ducted counterparts. Their energy efficiency, combined with the ability to control cooling in specific rooms, leads to a reduced carbon footprint. Moreover, these systems use an advanced refrigerant called R410A, which has zero ozone depletion potential.


Ductless air conditioners offer numerous benefits, making them an attractive choice for homeowners looking to upgrade their cooling systems. From cost-efficiency and improved air quality to easy installation and a lower carbon footprint, these systems provide a compelling alternative to traditional ducted air conditioners. If you are seeking a space-saving, customizable, and environmentally friendly cooling solution, a ductless air conditioner may be the perfect choice for your home.

All Things HVAC

Address: 4343 South view lane, Doylestown PA
Phone: 267-356-HVAC (4822)
Hours: Monday - Friday: 9am - 5pm
Copyright © 2024 AllThingsHVAC. All Rights Reserved