As our world continues to evolve and technology advances, homeowners are always on the lookout for efficient and innovative ways to maintain a comfortable living environment. Ductless mini-split systems have emerged as a popular choice, offering both heating and cooling capabilities without the need for extensive ductwork. Thompson Heating & Cooling, serving La Grange, Louisville, and the surrounding areas since 2003, proudly supplies and installs top-quality ductless mini-split systems from renowned manufacturers like Mitsubishi, ensuring that our customers enjoy optimal comfort and performance.

Ductless mini-split systems are a versatile and energy-efficient solution for homeowners who seek to upgrade or complement their existing heating and cooling setup. Additionally, they offer several advantages over traditional systems, such as higher energy efficiency, reduced noise, and the potential for zone-specific temperature control. However, despite these benefits, many homeowners are still unfamiliar with ductless mini-split systems, the installation process, and how best to maintain them.

This guide will provide the knowledge and understanding you need to confidently choose and care for a ductless mini-split system, ensuring a comfortable living environment for years to come.

How a Ductless Mini-Split System Works

A ductless mini-split system is a type of heating and cooling solution that does not require the installation of extensive ductwork throughout a building. It consists of an outdoor unit, which houses the compressor and condenser, and one or more indoor air handling units connected through a small conduit that runs through the wall between the indoor and outdoor units.

The outdoor unit absorbs heat from the outside air and transfers it inside during the heating season. On the other hand, during the cooling season, it absorbs heat from the indoor air and expels it outside. The indoor air handling unit or units circulate cooled or heated air within the room, maintaining a comfortable living environment.

Installation Process

The installation process for a ductless mini-split system is typically quicker and less invasive than installing a traditional HVAC system. It involves the following steps:

  1. Assessing your home’s needs: Working with a professional heating and cooling expert, like those at Thompson Heating & Cooling, you will determine the right size and type of ductless system to meet your home’s unique requirements. The number of indoor air handling units needed and their locations will be established during this phase.
  2. Selecting a suitable outdoor location: The outdoor unit should be placed on a leveled surface with adequate clearance from structures, plants, and debris to ensure proper airflow and access for maintenance.
  3. Mounting indoor air handling units: The indoor units are mounted on the walls in the designated locations, with careful consideration given to their aesthetic appeal and accessibility.
  4. Drilling a hole for the conduit: A small hole is drilled through the wall to connect the indoor and outdoor units. This hole accommodates the power cable, refrigerant tubing, and condensation drain line that link the two components.
  5. Installing the conduit: The conduit containing the necessary connections is run through the hole, linking the indoor air handler(s) to the outdoor unit.
  6. Connecting the electrical wiring: The wiring is connected, following all safety procedures, to supply power to the ductless system.
  7. Testing the system: Once installation is complete, the technician will test the system to ensure everything is functioning correctly and efficiently.

Advantages of a Ductless Mini-Split System

Ductless mini-split systems offer numerous benefits that enhance comfort and energy efficiency in your home, including:

  1. Flexibility: Ductless systems provide both heating and cooling, eliminating the need for separate solutions. Additionally, their ability to accommodate multiple indoor air handlers allows for zone-specific temperature control, giving you more control over your home’s comfort.
  2. Energy efficiency: With their inverter-driven compressors, ductless systems continuously adjust their output to match the demand, consuming less energy than traditional heating and cooling systems.
  3. Space-saving design: Ductless systems require less space and are less invasive than ducted systems, making them a great option for homes where installing extensive ductwork is impractical or undesirable.
  4. Improved indoor air quality: Ductless mini-split systems have built-in air filtration, which helps reduce allergens, dust particles, and other pollutants, promoting a healthier indoor environment.
  5. Quiet operation: Due to their advanced technology and design, ductless systems operate with minimal noise, making them an unobtrusive choice for maintaining home comfort.

Proper Maintenance for Your Ductless System

To ensure the longevity and optimal performance of your ductless mini-split system, follow these essential maintenance tasks:

  1. Clean or replace air filters: Regularly inspect the filters in your indoor air handling units and clean or replace them as needed. This will maintain the system’s efficiency and keep your indoor air quality high.
  2. Clean the outdoor unit: Periodically check the outdoor unit for any debris or dirt buildup and gently clean it to ensure proper airflow and efficiency.
  3. Inspect the condensation drain line: Ensure the condensation drain line is clear of blockages to avoid potential water damage or mold growth.
  4. Schedule professional maintenance: While some tasks can be done independently, it’s crucial to schedule regular inspections and tune-ups with a professional HVAC technician at least once a year to address components that require expert care.


Ductless mini-split systems are an innovative and flexible solution for homeowners seeking efficient heating and cooling without the installation of extensive ductwork. By understanding the technology behind these systems, weighing their advantages, and following best practices for maintenance, you can make an informed decision that will provide lasting comfort and energy savings. The team at Thompson Heating & Cooling, experts in providing whole-home comfort services, is here to help you navigate the world of ductless mini-split systems, ensuring that you make the best choice for your unique needs. Contact our air conditioning service in Louisville, KY for more details.

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