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Your Complete Guide To Installing Mini-Split AC On Interior Walls

Your Complete Guide To Installing Mini-Split AC On Interior Walls

Mini-split air conditioning systems are gaining popularity as a cost-effective solution for cooling indoor spaces. Typically, these systems are installed on exterior walls due to the convenience of running power and condensate lines over shorter distances. However, the question arises: can you install a mini-split on interior walls? In this article, we will explore the possibilities and factors to consider when opting for this setup.

Positioning The Mini-Split AC System

Your Complete Guide To Installing Mini-Split AC On Interior Walls

While installing mini-split indoor units on interior walls is possible, it comes with some challenges and additional costs compared to exterior wall installations. Mini-split blowers are typically placed on outside walls to simplify the installation process, as the pipelines can be routed externally. However, there are situations where interior wall installation is necessary.

When deciding on the placement of your indoor units, it’s essential to consider factors such as the capacity of the system and your heating and cooling needs. Keep in mind that not every room requires a blower unit, and focusing on quality over quantity can lead to more efficient cooling. Consulting with a qualified specialist is advisable to determine the optimal HVAC setup for your home, ensuring that your investment is well-placed.

Aesthetic And Cost Considerations

When installing mini-split indoor units on interior walls, two key considerations are aesthetics and cost. Ductless air conditioning systems require a continuous flow of refrigerant and air between components. When installed on an exterior wall, the pipes are often concealed outside the house. However, interior wall installations require running pipelines indoors to connect with the outdoor unit.

Concealing the pipes can be achieved by using sleeves or integrating them into existing house decor. This involves selecting materials and colors that match your interior design. Another option is running the pipes within the walls, which demands a sturdy wall structure to support the weight of indoor blowers.

While hiding the pipes enhances the aesthetics, it also increases the complexity and costs of the installation due to the need for additional materials, longer tubing, and extended labor. Proper planning is crucial to ensure that you can access hidden pipes for maintenance or future modifications without compromising the structural integrity of your walls.

Your Complete Guide To Installing Mini-Split AC On Interior Walls

Maintenance Of Hidden Pipelines

Maintenance accessibility is a vital consideration when installing hidden pipelines. Repairs or alterations might be required in the future, and having access to concealed pipes is essential. Collaboration with a qualified installer during the installation process minimizes the challenges associated with repairs. If future expansions are planned, ensuring cost-effective and safe modifications should also be taken into account.

Managing The Drain Line

Moisture is an inherent byproduct of air conditioning units, and managing the drain line is crucial during mini-split indoor installations. The drain line is typically connected to the house plumbing drain system, incorporating a trap to prevent sewage gases from entering the home. Professional HVAC technicians are well-equipped to design the drain layout to prevent issues related to moisture and refrigerant leaks.

FAQs About Mini-Split AC Installation

1. How much does it cost to install a mini-split air conditioning?
The cost of installing a mini-split system varies, ranging from $2,000 to $14,500, excluding the unit cost. For a standard household installation, including the device and professional installation, the average cost is approximately $2,500.

2. Can you install a mini-split AC by yourself?
While it’s possible to install a mini-split system on your own if you have the necessary skills, it’s recommended to hire a professional, especially if you’re unfamiliar with the installation process. Due to the absence of ductwork, installation is relatively straightforward, involving setting up the indoor and outdoor units, drilling a hole for connection, and wiring.

3. How long does it take to install a mini-split AC?
The installation duration varies based on the complexity. Installing multiple indoor evaporators may take two days, while a single evaporator connection can be completed in a day.

4. Do you need a license for mini-split AC installation?
Installing a mini-split AC typically doesn’t require a license. However, handling refrigerants, such as during refills, might require a license depending on the refrigerant and jurisdiction.

Your Complete Guide To Installing Mini-Split AC On Interior Walls


Opting for an interior wall installation of mini-split air conditioning units offers a viable solution for cooling indoor spaces. While it involves considerations such as aesthetics, costs, and maintenance accessibility, proper planning and collaboration with experienced professionals ensure a successful installation that enhances both the comfort and visual appeal of your living environment.

Your Complete Guide To Installing Mini-Split AC On Interior Walls

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