DIY Mini Split Installation Guide

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Are you tired of battling the heat in summer and shivering through the winter? Do you want to upgrade your home’s HVAC system without spending much money? If yes, a DIY mini-split installation can help you out!

Imagine enjoying personalized comfort in every room of your home all year round. The best part is that you don’t have to spend money on hiring a professional installer. With just a bit of creativity and effort, you can transform your living space into a comfortable place.

In this guide, we’ll walk you through the steps of installing a mini-split system at home. So, are you ready for this interesting journey? If yes, grab your tools and get started with this exciting journey.


Firstly, you need to ensure that you have all the supplies available for this project.


Before you begin, gather the following tools:

  • Screwdriver
  • Drill
  • Pipe cutter
  • Level
  • Tape measure
  • Wrench set
  • Vacuum pump
  • Refrigeration manifold gauge set
  • Safety gloves and goggles


Along with the tools, make sure you have these materials on hand as well:

  • Mini split system (indoor and outdoor units)
  • Mounting bracket
  • Refrigerant line set
  • Condensate drain line
  • Electrical wire
  • Insulation foam
  • Wall sleeve
  • PVC pipe and fittings
  • Concrete pads (for outdoor unit)
  • Anchor bolts
  • Weatherproof sealant

Steps To Install DIY Mini Split

Now that you have all the tools and materials ready follow the given steps for mini split installation at home:

Step 1: Choose the Location

DIY Mini Split Installation Guide

Selecting a location for installation

Select a spot indoors for the indoor unit and another spot outdoors for the outdoor unit. Ensure both locations have proper clearance and access to electricity.

Step 2: Install Mounting Bracket

DIY Mini Split Installation Guide

Installing the mounting unit for mini split

Use the drill and screws to securely attach the mounting bracket for the indoor unit to the wall.

Step 3: Drill Holes

DIY Mini Split Installation Guide

Drilling a hole

Drill a hole through the wall for the refrigerant line set, condensate drain line, and electrical wire.

Step 4: Connect Refrigerant Lines

DIY Mini Split Installation Guide

Connecting the refrigerant lines

Carefully connect the refrigerant lines from the indoor unit to the outdoor unit according to the manufacturer’s instructions.

Step 5: Connect Drain Line

DIY Mini Split Installation Guide

Connecting the drain lines

Attach the condensate drain line to the indoor unit and ensure it slopes downward to allow proper drainage.

Step 6: Connect Electrical Wiring

DIY Mini Split Installation Guide

Making the electric connection

Connect the electrical wire from the indoor unit to the outdoor unit, following electrical codes and safety precautions.

Step 7: Secure Outdoor Unit

Secure Outdoor Unit

Installing the outdoor unit

Place the outdoor unit on the concrete pads and secure it using anchor bolts. Ensure it is level and stable.

Step 8: Test System

Test System

Testing the system

Turn on the power and test the system to ensure everything is functioning properly. Check for any leaks or abnormal noises.

Step 9: Insulate Pipes

Insulate Pipes

Insulating the pipes

Use insulation foam to cover the refrigerant lines and drain lines to prevent condensation and improve efficiency.

Step 10: Seal Wall Opening

Seal Wall Opening

Seal the hole, and the mini-split installation is done

Seal around the hole in the wall with weatherproof sealant to prevent air leaks and moisture infiltration.


  1. Always wear safety gloves and goggles when working with power tools and refrigerants.
  2. Carefully read and follow the manufacturer’s instructions for your specific mini-split system.
  3. If you’re unsure about any step of the installation process, don’t hesitate to consult a professional.

Things to Remember

  1. Make sure to choose a mini-split system that is appropriately sized for the space you are heating or cooling.
  2. Regular maintenance, including cleaning filters and coils, is essential for optimal performance and longevity.
  3. Check local building codes and obtain any necessary permits before installing your mini split system.

With this DIY mini split installation guide, you can enjoy living in comfort. So, stop spending money on installers and do it on your own.

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