How do you install a MrCool mini split?

How do you install a MrCool mini split?

Installing a MrCool mini split system is a project that many homeowners choose to undertake to improve the heating and cooling efficiency of their homes.

MrCool mini splits are popular because they offer a ductless heating and cooling solution that is energy efficient, relatively easy to install, and versatile for various living spaces. This comprehensive guide will walk you through the steps of installing a MrCool mini split system, including planning, installation, and testing phases.

1. Planning and Preparation

Choosing the Right Model: Before purchasing your MrCool mini split, ensure you select the right model for your space. Consider the size of the room, insulation quality, and climate to determine the BTU (British Thermal Unit) rating needed for efficient operation.

Gathering Tools and Materials: You will need various tools and materials for installation, including:

  • Drill and drill bits
  • Screwdrivers
  • Level
  • Tape measure
  • Crescent wrench x2
  • Electrical supplies according to your model’s requirements

Understanding Local Codes and Regulations: Check your local building codes and regulations to ensure compliance, especially concerning electrical connections and refrigerant handling. You might need to hire a professional for certain steps to meet these requirements.

2. Installation Process

Indoor Unit Installation:

  1. Selecting the Location: Choose a spot on the wall that is away from direct sunlight, heat sources, and any obstructions. Ensure the location allows for proper drainage and is within reach of the outdoor unit.

  2. Mounting the Bracket: Use the supplied template to mark the position of the wall mounting bracket and use a level. Drill holes, insert wall plugs, and secure the bracket with screws.

  3. Preparing the Refrigerant Lines and Electrical Connections: Drill a hole through the wall for the refrigerant lines, electrical cables, and drainage hose. Ensure the hole slopes slightly downward toward the outside to facilitate drainage.

  4. Installing the Indoor Unit: Feed the refrigerant lines, electrical cables, and drainage hose through the hole, then mount the indoor unit on the bracket. Ensure it is securely attached and level.

Outdoor Unit Installation:

  1. Choosing the Right Location: The outdoor unit should be placed on a flat, stable surface with adequate clearance from walls and obstructions for proper airflow and maintenance access.

  2. Mounting the Outdoor Unit: If necessary, install a concrete pad or mounting brackets to elevate the unit off the ground. Secure the outdoor unit in place, ensuring it is level.

  3. Connecting Refrigerant Lines: Connect the refrigerant lines from the indoor unit to the outdoor unit, using crescent wrench to ensure the connections are secure and leak-free. It's crucial to follow the manufacturer's specifications for tightening these connections.

  4. Open the circuit refrigerant valves: Using the supplied allen wrench, open the valve(s) as instructed in your particular system. MrCool mini splits come pre-charged with refrigerant. 

  5. Making Electrical Connections: Connect the electrical cables between the indoor and outdoor units, and from the outdoor unit to the power supply, following the wiring diagram provided by MrCool. This step may require a licensed electrician.

3. Testing and Final Setup

  1. Checking for Leaks: After all connections are made, check the system for leaks using a spray bottle. It's crucial to ensure that the refrigerant lines are sealed properly to prevent leaks and ensure efficient operation.

  2. Electrical Testing: Once the electrical connections are made, turn on the power and test the system to ensure it operates correctly. Check all functions, including cooling, heating (if applicable), and fan operations.

  3. Setting up the Remote Control: Program the remote control according to the manufacturer's instructions. Set the desired temperature, fan speed, and any other features your MrCool unit offers.

  4. Reviewing Maintenance and Operation Instructions: Familiarize yourself with the maintenance schedule and operational guidelines provided by MrCool to ensure your mini split system runs efficiently and lasts for years.


Installing a MrCool mini split system can be a rewarding project that enhances your home's comfort and efficiency. While many steps can be completed by a DIY enthusiast, it's essential to recognize when professional help is needed, especially for electrical wiring. Always prioritize safety and follow the manufacturer's instructions and local regulations closely. With proper installation and maintenance, your MrCool mini split will provide efficient, and reliable heating and cooling for your home for many years to come!

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