Can You DIY a Dual Zone Mini Split?

You think a dual zone mini split will be perfect for your new workshop, cabin, garage, or whatever. But can you 'DIY' it or is this a job just for the pros?

What is a Dual Zone Mini Split?

For those of you just joining us on this journey, you may be asking, "What exactly is a dual zone mini split?" Good question!

A ductless mini split is a compact, versatile heating, air conditioning, and ventilating product. It consists of an interior air handler connected to an exterior condenser via refrigerant lines and communicating wire. Which means that it so far sounds exactly like a full-size central split system, but a ductless mini split, as the name implies, does not connect to ductwork. Also, the condenser and air handler are much smaller. These sorts of systems are great for single-zone applications in areas not serviced by a central unit.

Going from there, we can surmise that a dual zone mini split is a ductless system that services two interior zones instead of one. There is a solitary outdoor condenser that connects to two interior air handlers. They give you a more flexibility than a single-zone, and the installation isn't that much more difficult.

Dual Zone Mini Split Installation Requirements

A typical dual zone mini split is a contractor-grade product. What do we mean by that? What we mean is that the lines need to be properly flared and connected, vacuumed, and charged to the appropriate specifications. Specialized tools and training is necessary to do this accurately. Proper licensing from the EPA is necessary to do it legally.

In short, a regular dual zone mini split is not something the average person can take out of the box and install. Do they do this anyway? Yes, of course. Does it often cause problems and always void the product warranty. Also, yes.

MrCool Mini Split Options

Single Zone Mini Split

Now, we know someone is going to inevitably ask us about MrCool mini splits. MrCool is well known as the maker of a do-it-yourself mini split called, appropriately, the DIY. MrCool also has a multi-zone called Olympus. Couldn't the average homeowner go out and get an Olympus dual zone mini split and install it themselves without special tools and training just like the MrCool DIY? No.

Many people see ads for the MrCool DIY, and then assume that all MrCool ductless products are do-it-yourself. This is not the case. The MrCool Advantage, a single zone system, is not for amateur installation. Similarly, the Olympus, as stated before, is not do it yourself. Both should be installed by qualified, professional technicians.

Dual Zone Mini Split

People ask us all the time about multi zone DIY mini splits, dual zone or otherwise. This is something that MrCool has been quietly working on for a few years. We've likewise been eager to get them. Happily, a MrCool DIY dual zone mini split is a product that we can confidently say will be coming out this summer.

So, MrCool at one time did not have a dual zone mini split that you can install yourself, but they do now and we are getting them. The MrCool DIY multi-zone mini split line is set to arrive in our warehouse facilities to fulfill orders around the third week in May 2020. Should we get them sooner than that, we will definitely let you know about it.

As you might expect, this is a product that we can't wait to get in front of people. We have a lot of customers interested in them. In fact, there is so much interest that you can pre-order a MrCool DIY Multi-Zone mini split now.

14 comments (view/add)
  • Karl
    Posted on 4/9/2020

    How do I find a qualified installer? What are the search terms or specific requirements, and what should I ask him and what will he charge?

  • Kyle
    Kyle from Ingrams
    Posted on 4/9/2020

    Good question! You can always use services such as Angie's List or Houzz to find well-reviewed qualified installers in your area. You can also Google search for HVAC installer with your city name or zip code. When it comes to what they should charge, it is always a good idea to get two to three different companies to provide you with an estimate. Don't necessarily take the lowest estimate, but different opinions should give you enough data to make an educated guess about which one is trying to rip you off and which ones aren't.

  • Matt
    Posted on 4/12/2020

    When will the multi-zone DIY be available? And will there be a line set option greater than 25'?

  • Kyle
    Kyle from Ingrams
    Posted on 4/13/2020

    We have been told that it will be available in late May. We do not have confirmation of a line set longer than 25'. However, there will be couplers available to connect two lines together to extend beyond 25'.

  • Arquimedes ( Ronie)
    Arquimedes ( Ronie)
    Posted on 4/17/2020

    So the multi-zone will be the same concept as a single zone that you will be able to connect to the condenser without vacuuming the lines?

  • Kyle
    Kyle from Ingrams
    Posted on 4/20/2020


  • Mike
    Posted on 4/30/2020

    In a dual zone system do you have to install both zones at the same time or can you install and use one zone and then install the 2nd zone maybe a few weeks later.

  • Kyle
    Kyle from Ingrams
    Posted on 5/1/2020

    Yes, that is possible.

  • Thomas Knuepfel
    Thomas Knuepfel
    Posted on 5/1/2020

    If you have a single zone already installed can you "upgrade" to a duel zone keeping your original air handler (one) and getting a new condenser(?) or do you need to get a complete new set of components?

  • Kyle
    Kyle from Ingrams
    Posted on 5/4/2020

    You could possibly 'upgrade' in that way. It would depend on whether or not the existing air handler would be compatible with the new dual-zone condenser. You would definitely have to have a new condenser, since single-zone condensers are not built do support multiple air handlers.

  • Bill
    Posted on 5/4/2020

    Realistically, in winter, at what outside temperature, does the DIY, 36K BTU, 2 zone mini split, NOT heat?. I have a 1032 sq. ft., 5 room home, blown insulation, 2x6 walls, with high vaulted ceiling in living room, and partial loft, with ceiling fan of 5200 air flow on high speed, remaining 4 rooms have 8 ft. ceilings. Also, is the 36K BTU, 2unit split, normally enough to heat and cool the house?. Or would I need a 42K or 48K to heat and cool the house? I also have the same the winter low temperature heating questions about those units. We are an old couple and don't want to under buy or over buy for comfort heating and cooling.
    Thank you,

  • Kyle
    Kyle from Ingrams
    Posted on 5/5/2020

    The DIY 36k stops heating at 5 degrees. Which means performance degrades significantly before that. Which may or may not be a problem depending on what your typical winter temperatures average.

    In terms of 36k performance in a 1032 sq ft space, the 36k can usually handle up to 1500 sq ft. However, given the way your home is divided, you may want to think about a three or four zone system.

    Overall, there are a number of variables to take into account. I recommend you give us a call at 270-575-9595. Talk with one of our team members, and they can help you make sure you get the air comfort you need.

  • ken rosenberg
    ken rosenberg
    Posted on 5/25/2020

    I plan on purchasing a Mrcool DIY - ASAP. Deciding between a few configurations. either a single zone 24K or 36K (right on the fence, could go either way). Or a dual zone with a 24K and a 9K head which would allow me to include a bonus suite in the structure. It looks like the multi-zone configuration available for pre-order on your site can support up to 4 heads. Is there a drawback to only using 2 of the connections? Are these divided equally within the condenser? Would the 24k be fulfilled with the 9k also connected and the remaining 2 sets of cooling lines not in use?
    thanks for your guidance

  • Kyle
    Kyle from Ingrams
    Posted on 5/26/2020

    There would be no significant drawback to using less than the maximum air handlers on a Multi-Zone.

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