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How To Install A Mini Split

How To Install A Mini Split

Jon Hubal
6 minute read

You’ve decided to take the plunge and install a mini split in your home. Great choice - those efficient units can save you a bundle of energy costs while keeping you comfortable all year long. But mini splits can seem complicated to install, and you’re probably wondering where to even start. Don’t worry, with some patience and the right tools, installing a mini-split is doable as a DIY project. In this guide, we’ll walk you through the entire process step-by-step, from picking the right unit for your needs to mounting the outdoor condenser and connecting all the lines. By the end, you’ll have a fully functioning mini-split and a new set of skills to feel proud of. So grab your wrench and let’s get started!

How To Install A Mini Split

Planning Your Mini Split Installation: Costs, Permits, and Location

Installing a mini split air conditioner yourself can save you a bundle of cash, but it does require some planning. First, determine if you need any permits to install in your area and if you have the skills to take on this DIY project. If you’re not highly handy, you may want to consider hiring a pro.

Once you’ve decided to proceed, pick out your mini split components: the outdoor compressor unit and one or more indoor air handlers mounted high on walls. Choose a model based on the number of rooms or zones you want to cool. Prices typically range from $500 to $2,500 per unit.

Next, choose installation locations. The outdoor unit needs a solid, level mount, like a concrete pad, and should be placed in an area with good airflow and shade. Indoor units should be installed high on walls opposite the main heat sources in the rooms. There should be no major obstacles between the outdoor and indoor units.

You’ll want to buy refrigerant line sets, drain lines, wiring, and mounting hardware. Read the instructions and familiarize yourself with how these components connect the indoor and outdoor units. Have tools like a vacuum pump, flaring and swaging tools, gages, and a multimeter on hand.

Once the units and lines are mounted, it’s time to power up your mini-split. Double-check all connections, seal and insulate the lines, then test to ensure everything is working properly. Perform regular maintenance like clearing debris from intakes and filters to keep your mini split running efficiently all season long.

With some time and patience, you can install a mini split yourself. Do your homework, get the necessary gear, and take it slow—you'll be enjoying cool comfort in no time!

Tools and Equipment Needed for Installation

First, you'll want a vacuum pump to remove air and moisture from the lines. You'll also need a manifold gauge set to check pressures, a flaring tool to connect lines, pipe cutters, and wrenches for tightening fittings.

For mounting the unit, you'll need a level, drill/driver, screws or bolts, and washers. Don't forget a tape measure, hammer, wire cutters, and strippers.

Refrigerant and Lines

  • To connect the indoor and outdoor units, you'll need refrigerant lines in the appropriate diameter and length for your system. You'll also need refrigerant, typically R410a. Make sure you have enough refrigerant for the line set length and unit capacity according to the specs.

Condensate Removal

  • For removing excess condensation, have a condensate pump and hose or pipe handy. Place the end of the hose/pipe in a drain, sump pump, or outside.

Electrical Supplies

  • Finally, for providing power you'll need appropriate gage wire, disconnect switches, circuit breakers, and a wire stripper/cutter. Make sure the wiring is properly grounded and rated for the unit amperage.

With the right tools and equipment in hand, you'll be ready to start your mini-split installation. Take your time and follow the instructions carefully for best results. If anything seems too difficult, don't hesitate to call an HVAC pro. Your unit warranty may require professional installation anyway.

Step-by-Step Guide for Installing a Ductless Mini Split Air Conditioner

Now that you have all the necessary components, it’s time to install your mini split air conditioner. This is a DIY project for those comfortable with minor electrical and HVAC work. If that’s you, follow these steps:

Select the Installation Location

  • Choose an area on an exterior wall where you want to install the indoor unit. Consider factors like available space, proximity to electrical outlets, and esthetics. Ensure the area is clear of obstructions so you have room to install the unit and access it for servicing.

Install the Outdoor Unit

  • Mount the outdoor unit on brackets to the wall or ground, following the manufacturer’s instructions. Place it on a stable, level surface in an area with good air circulation. Connect the refrigerant lines and wiring to the indoor unit before installing the outdoor unit.

Connect the Refrigerant Lines

  • Uncoil the refrigerant lines and run them from the indoor unit to the outdoor unit. Evacuate air from the lines using a vacuum pump and manifold gauge set. Once evacuated, release the refrigerant from the outdoor unit into the lines. Check for any leaks in the system before proceeding.

Connect the Electrical Lines

  • Connect the power supply cable to the indoor and outdoor units according to the wiring diagram. Ground the units properly to avoid the risk of electric shock. Turn on the power supply and test your mini split to ensure it’s functioning properly before closing up the installation.

Test and Finish the Installation

  • Power on your mini split and test all its functions - cooling, heating, fan speed, temperature, etc. Once everything checks out, you can close up the installation by patching any holes or sealing around lines with caulk or weatherstripping tape. Congratulations, your DIY ductless mini split installation is now complete!


So there you have it, a step-by-step guide to installing your own mini split air conditioning unit. While it may seem complicated, if you take your time and follow the instructions carefully, you'll have cold air pumping through your home in no time. Think of the money you'll save and the satisfaction of doing it yourself. Once it's up and running, you'll be enjoying the comfortable temperature all summer long. When your friends ask how you managed to afford such an efficient cooling system, you can proudly say you did it yourself. Who knows, you might even offer to help them install one too after seeing how straightforward the process is.

More Mini Split Knowledge!

Delve into a wealth of mini-split expertise through our vast online resources. Immerse yourself in a wide array of informative blog posts covering a range of subjects. Evaluate the leading mini split models for 2023 to determine their suitability for your needs. Explore our comprehensive guide on mini-split sizing for valuable insights. Gain the knowledge to effortlessly install your DIY mini-split system. Deepen your understanding of mini-splits and confidently take control of your indoor climate.


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