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DIY Mini-Split Installation - At Home HVAC Tech

DIY Mini-Split Installation - At Home HVAC Tech

Jon Hubal
5 minute read

More and more people are switching to ductless mini-splits than ever, but professional installation can be costly – especially when added to the cost of the system itself. So let's discuss DIY Mini-Split Installation

Don't worry! With many great DIY kits from established brands available, putting in your ductless system is easier than ever and can save you thousands. This quick guide shows how simple installing your system can be in four easy steps.

DIY Mini-Split Tools Required

  • Adjustable Wrench
  • Drill and Driver
  • Hole Saw
  • Level

DIY Recommended Materials

  • Wall Brackets or Plastic/Concrete Pad (condenser)
  • Wall Brackets (evaporator)
  • Plastic Line Set Cover Kit
  • Screws

Steps to DIY Mini-Split Install

Step 1: Power to your mini-split 

First, you need to get power to the system. Mini-splits usually run on 120V or 220V. A small system might allow you to tie into your pre-existing circuit, but the safest practice is dedicating a new breaker line to it by running a cable from the main panel to the unit. Remember to turn off the power before you begin working! Safety first, friends.

Step 2: Condenser Placement

The first step for installing your outdoor unit is finding the best location. Ideal locations should have good air circulation/ventilation, a solid base that can support the unit, and be as obscured from sight and sound as possible. If you can, position the unit to protect it from the weather (snow, rain, sun, etc.).

Install the base for the condenser. If mounting on the ground, place the foundation pad. If wall mounting, install the condenser brackets. Either way, make sure to leave ample clearance around the unit. How much clearance should be specified in the manufacturer's manual, but at least 12" inches is recommended. 

Mini-Split Outdoor Condenser Placement

Step 3: Air Handler Placement

In the room you want air conditioning, choose an exterior wall that leads to the outside. Like the condensing unit, find an area large enough to house it and where things like furniture or shelving won't block it. The manual should list required clearances. Ensure the spot is free of wires and pipes before you make your hole. Locate the studs and fasten the bracket to them with screws. Make sure to use a level when installing your brackets; it's essential for proper function. 

Drill a 2-3" hole in the wall between the brackets. The hole is typically in the lower left or lower right-hand corner but refer to the manufacturer's manual for your specific unit. Create a downward slope with your hole saw to allow condensation to drip down to the outside. 

Feed the refrigerant line, drain tubing, and control wiring through the wall (electrical tape helps keep them together). Connect all your lines to the outside condenser, indoor evaporator, and control wire to the circuit. Please note, DIY kit refrigerant lines come pre-charged. Be careful not to cut or break pre-charged lines – this is very dangerous.

Once everything is hooked up, it's time to mount your air handler. Replace any insulation lost in the process for better efficiency.

Last but not least, cover your refrigerant line set with some casing. Metal works great, but plastic is a more cost-effective solution for the DIY'er.

Mini-Split Air Handler Placement

Step 4: Testing the DIY Mini-Split

Make sure to test your system – especially before you need it!

If you need more confidence with electrical or HVAC, having a licensed professional check never hurts to make sure it all checks out. Local inspectors are often happy to help, especially when safety is involved.

Want to DIY?

Check our MRCOOL Do-It-Yourself 4th Generation E Star DIY. Its Sophistication Simplified and Comfort Made Simple. Or check out our entire MRCOOL collection

E Star DIY 4th Gen 36k BTU Ductless Mini-Split Heat Pump Complete System - 208-230V/60Hz

E Star DIY 4th Gen 36k BTU Ductless Mini-Split Heat Pump Complete System - 208-230V/60Hz


The E Star DIY 4th Gen 36k BTU Ductless Mini-Split Heat Pump Complete System - 208-230V/60Hz is a high-performance heating and cooling solution for medium to large-sized spaces. It is designed for DIY (do-it-yourself) installation and includes everything needed to… read more

Onward to your DIY Journey 

We highly recommend if you feel uncomfortable with any of these steps that you get a trained professional to come to help you. Whether that be electrical or HVAC - when in doubt call for help. 

Happy heating!

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