DIY Ductless Installation

For decades, ductless mini-split heat pumps and air conditioners were popular everywhere except the United States. Increasingly, this is no longer true. Many Americans are now turning to these innovative HVAC products due to their compact installation footprint and relatively low cost. The home improvement market has also embraced the systems. Which leads to the question: is DIY ductless installation viable for most homeowners or a job best left to the professionals?

Usually, Trust the Professionals

Ductless mini-splits are smaller and lighter than conventional systems. They don't connect to bulky air ducts. Overall, they're much simpler to install.

That does not mean installation is necessarily easy or non-technical. The average person should not attempt DIY ductless installation. That average homeowner would have to go buy specialized equipment and learn how to use it. By the time they did all that, it is highly unlikely they would save enough money to justify the effort.

So, in most cases, we highly recommend leaving it to a professional.

Except for....

MRCOOL DIY Ductless Installation

We recommend only one ductless DIY product: the MRCOOL DIY. Why? It is the only mini-split designed explicitly for amateur installation.

How do they do that?

The real key is the way they design the refrigerant lines. Typically, a professional needs to flare, vacuum, and properly charge the lines with refrigerant. The MRCOOL DIY gets around that by pre-charging and pre-sealing the lines before they leave the factory. They use special plunger fittings to prevent any refrigerant escaping or any foreign particulate from entering the lines. Which means specialized equipment like a vacuum pump is not required.

The only portion of MRCOOL DIY ductless installation that requires technical help is the electrical. For that, we really encourage our customers to hire a good electrician. Many people do DIY electrical work, but it's just not something we're comfortable recommending.

Have you done your own DIY ductless installation with a MRCOOL DIY or other min-split? If so, let us know in the comments!

7 comments (view/add)
  • srg
    Posted on 6/4/2018

    Ordered a Mr. Cool DIY unit and look forward to installing it. One question: is a torque wrench needed when attaching the lines to the outdoor unit?

  • Kyle
    Kyle from Ingrams
    Posted on 6/4/2018

    According to the installation manual, a torque wrench is not required.

    Posted on 6/4/2018

    Installed 1 week ago took less than 3 hours to have it up and running. The hardest part and most work was pouring the concrete slab, otherwise followed the instructions and everything went smoothly. The unit is pretty quit and cools nicely.

  • Kyle
    Kyle from Ingrams
    Posted on 6/5/2018


  • David
    Posted on 7/3/2018

    Bought a 12K three seasons ago for the bedroom upstairs. Love it. Installed a 18k down stairs last week. Easy install. Cools the entire 1,000 sq ft first floor keep the house about 20-25 degrees cooler than the outside. I use the PVC platform, no cement slab. Works great.
    Funny story: I'm having some work quoted from one of the big box building supply stores, he noticed it and I think I made a sale for Ingrams.

  • albert Nghiem
    albert Nghiem
    Posted on 7/7/2018

    What is a electrical power supply to the evaporator fan ? is it 220 volts or 110 volts ? can it be 110 volts? The condenser needs 220 volts for the compressor to run. the fan also needs 220 volts ????

  • Kyle
    Kyle from Ingrams
    Posted on 7/9/2018

    For the MRCOOL DIY, the air handler evaporator is wired to the outside condenser. The DIY 12k is 110v. The other models are 220v.

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