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How to Install a Mini Split: A Comprehensive Guide for DIY and Professional Installation

Installing a mini-split system may seem like a daunting task, whether you're a professional contractor or a handy homeowner. However, it's actually much easier than you might think. Unlike traditional AC systems, mini splits don't...

Installing a mini-split system may seem like a daunting task, whether you're a professional contractor or a handy homeowner. However, it's actually much easier than you might think. Unlike traditional AC systems, mini splits don't require ducts and only need a small hole to connect the indoor and outdoor units.

In this article, we'll provide you with a step-by-step guide on how to install a mini split system. Whether you're considering a DIY installation or hiring a professional, we have you covered. We'll also share some valuable tips on optimal unit placement to maximize the efficiency of your mini split.

DIY vs Professional Installation

One of the most frequently asked questions is whether it's possible to install a mini split system yourself. The answer is a resounding yes! Not only is DIY installation possible, but it can also save you money. Mini split systems are highly efficient compared to central heating and air systems, which means you'll save money in the long run.

To ensure a successful installation, keep a few key factors in mind. By considering these details, you'll make the installation process much smoother and more successful.

How to Install a Mini Split in 3 Steps

Installing a mini split system can be divided into three parts:

  1. Install the indoor unit
  2. Install the outdoor unit
  3. Connect the refrigerant piping from the indoor unit to the outdoor unit

Before you begin the installation process, make sure you have the necessary tools and parts on hand.

Tools & Parts for DIY/Professional Mini Split Installation

For a professional installation, you'll need the following parts:

  • Mounting plate*
  • Clip anchors*
  • Seal*
  • Drain joint*
  • Wall sleeve*
  • Nitrogen Tank
  • Drill
  • Hole Saw
  • Torque Wrenches
  • Vacuum Pump
  • Flare Tool
  • Tube Cutter
  • Screwdriver
  • Allen Wrenches
  • Spray-on Leak Detector
  • Adjustable Wrench
  • Digital Refrigerant Scale
  • R410a Manifold Gauges
  • Tape Measure
  • Line sets*

*Included in a DIY mini split

For a DIY installation, you'll only need the following tools:

  • Drill
  • Screwdriver
  • Hole Saw
  • Adjustable Wrenches

Step-by-Step Guide on How to Install a Mini Split

  1. Install the mounting bracket

    • Look for a section of wall free of wires, pipes, and ducts.
    • Mark the stud locations and ensure the space behind can be safely drilled.
    • Fasten the screws and mount the bracket.
  2. Make a pilot hole

    • Drill from the inside to the outside, pointing the drill slightly downwards.
    • Check outside for any obstructions before drilling the actual hole.
  3. Drill the actual hole

    • Use a hole saw to bore from the inside to the outside.
    • Inspect the hole for obstructions before completing the drilling.
  4. Run the AC line set

    • Unpack the mini split line set and uncoil it from the evaporator.
    • Feed the line through the hole from the inside to the outside, with someone's help on the outside.
    • Bend the line set down to the condenser and ensure the plastic collar stays in place.
    • Run the drain last, connect the drain extension, and wrap it with electrical tape.
    • Cover the line set section within the hole with a foam sleeve and replace the insulation in the wall cavity.
  5. Install the evaporator

    • Place the evaporator on the mounting bracket and ensure it sits snugly on the wall.
  6. Install the condenser

    • Check the line set's reach to the condenser without any routing or obstructions.
    • Follow the electrical installation specifications and mount the condenser on the wall or a suitable pad.
    • Ensure the placement area is free from hindrances that can affect its operation.
  7. Connect the refrigerant lines

    • Follow the brand's instructions to connect the refrigerant lines.
    • Lock the line connections together properly and ensure no straining, kinks, or hindrances to the flow.
    • Test the connection by powering up the system.
  8. Cover the line set

    • Verify that the mini split is working properly.
    • Seal the hole from the outside and cover the line set with protective plastic covering or a metal channel.
    • Secure the covers with self-tapping screws to prevent movement and protect against the elements.

Buying a Mini Split

When buying a mini split, there are various options available. For DIY installations, MRCOOL DIY mini splits are perfect due to their easy installation and comprehensive package. They come with everything you need, so there's no need to run to the hardware store for additional parts.

If you're a contractor or planning to hire one, we offer a wide selection of mini splits from renowned brands like LG, Daikin, and Panasonic. To determine the right model for your needs, use our Air Conditioner BTU Calculator.

MRCOOL DIY Mini Split The MRCOOL DIY mini split system is easy to install and requires no special tools.

In Over Your Head? Call Us for Guidance

If you're feeling uncertain about installing a mini split system yourself, don't hesitate to hire a reputable and qualified HVAC professional. If you need guidance or have any questions related to mini splits, give us a call, and we'll be more than happy to assist you.

Remember, with the right tools and guidance, installing a mini split can be a rewarding and cost-saving experience. So, get ready to enjoy the comfort and efficiency of a mini split system in your home or office!