Where Should I Install Mini-Split Air Conditioners?

By Elizabeth Michael

June 17, 2024

Ductless mini-split air conditioners are all the rage these days, thanks to their ductless designs, energy-efficient capabilities and the fact that they can be installed on multiple walls in the home for customized cooling. However, the indoor units work best when installed in higher-traffic rooms away from windows and doors to ensure optimal efficiency.

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If you're thinking about making the switch to a mini-split AC, it's always a good idea to enlist the services of a licensed HVAC company to help with installation. Experienced HVAC technicians know exactly where to install the air conditioners to maximize their cooling power.

What Is a Mini-Split Air Conditioner?

A mini-split air conditioner is a specialized type of cooling system that cools your space by extracting indoor heat and pushing it outside. Mini-splits consist of a single outdoor compressor and up to four indoor evaporator units. They cool your space by extracting heat from inside your home and pushing it outside. As an added bonus, mini-splits can pull double-duty in the winter and heat your space. The process is simply reversed so the outdoor unit (heat pump) pulls heat in from the outdoor air and transfers it inside.

How Does the Layout and Design of a Room or Space Influence Mini-Split AC Installation?

Mini-split air conditioners work best when installed on high walls, as this allows for optimal air distribution. When installing your mini-split, it's recommended to have at least 1 foot of space around each side and in front of the unit to prevent air obstruction.

It's also important to avoid installing the indoor units near sources of heat such as fireplaces and areas that catch direct sunlight. Installing your mini-split in rooms with multiple windows or near doorways isn't recommended, as the natural airflow can interfere with the unit.

Are There Specific Guidelines for Mounting Indoor and Outdoor Units of Mini-Split Systems?

While requirements for mini-split installation can vary depending on the make and model of the unit and specific layout of the space, here are some general guidelines to consider:

Install on vertical perimeter walls. Outdoor units connect best to indoor units when installed on vertical perimeter walls.
Avoid installing near direct sunlight. When indoor units are placed in the line of direct sunlight, it can change room temperatures and affect how the unit cools the space.
Install high up on the walls. Installing indoor units at least 6 to 7 feet from the floor can help maximize cool air distribution. It's also recommended to leave between 4 and 6 inches between the unit and the ceiling. The manufacturer's guide for your specific model will also provide mounting instructions.

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Pros and Cons of Installing Mini-Split Air Conditioners in Different Locations

Installing a mini-split in a draft-free room with minimal furniture can help maximize its efficiency, while placing a unit near windows or areas of direct sunlight can affect its overall cooling ability.

Pros:

Placing a mini-split at least 6 feet above the floor helps maximize cool air distribution.
Mini-splits are ideal for cooling down attics and top-floor rooms where heat can be excessive.
When installed in multiple locations in the home, users can control the temperature of each individual room and turn off each unit when desired.

Cons:

Installing a mini-split AC in an overly cold room can affect its efficiency and lifespan.
Installing an outdoor unit near trees and bushes can increase the risk of obstructed airflow.
Installing a mini-split near curtains, furnishings or electronics can hinder the unit's consistent airflow.

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