Ductless Mini-Split Installation Tips

Compared to a conventional central heating and air system with all its ducts and registers, ductless mini-split installation is relatively simple. You need fewer parts and specialized tools. The components are generally lighter and easier to handle. Plus, you only have to optimize performance in one room as opposed to many.

But, that doesn't mean there aren't important considerations to keep in mind.

Best Location for Ductless Mini-Split Installation

The best location for ductless mini-split installation depends on a few different factors. First, there are a few things to consider:

  • What interior zone requires targeted heating and cooling?
  • Does the zone have an exterior wall nearby?
  • If there is no exterior wall in the zone, which wall is closest to the outside of the house?
  • Can the exterior environment adjacent to the targeted zone accommodate a mini-split condenser?

For example, suppose you want to deliver extra cooling power to the master bedroom. The master bedroom is located on the northeast corner of the house, and outside the north and east wall is ample yard space.

In this example, you could mount the interior system on either the north or east wall to correspond with the exterior ductless mini-split installation location.

If the room you wanted to cool doesn't have an exterior wall, you'll need to run the coolant tubes and wiring through an attic or crawl space to connect the interior and exterior halves. This shouldn't be a problem, since most mini-split manufacturers include plenty of material to deal with such problems.

Drainage for Ductless Mini-Split Installation

Most ductless air handlers use a drain hose to remove condensate from the interior air handler. This is absolutely essential, since all heat pumps and air conditioners generate significant water byproduct. You don't want that water running down your inside walls. Which means ensuring the condensate hose is always angled down is critical. Be certain that the ductless mini-split installation site you choose will allow water to flow smoothly out of your home.

Suppose you want to put the air handler in a location where it would be difficult or impossible to run a drain hose down and outside. The solution is a condensate pump. Many mini-split units can accommodate these. They pump the water out, so it doesn't ruin your interior.

Mounting Options for Ductless Mini-Split Installation

An outside ductless condenser is designed to weather the elements, but you can't just plop it out onto the ground. It needs to be properly placed on a base pad or wall mount.

A base pad is a cost effective and simple solution. You can buy a durable plastic pad or pour a simple concrete slab. Many homeowners opt for this, since it's very straightforward.

In some ductless mini-split installations, it may be desirable to use a wall mount either near to the ground or further up on an exterior wall. Make sure you buy a bracket strong enough to support the weight of your condenser. Don't guess! The last thing you want to see is a condenser falling off the side of your home.

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8 comments (view/add)
  • Peter
    Posted on 4/15/2019

    On these diy units, how are they powered? Can they just be plugged into wall outlet? Or do they have to be hard wired?

  • Kyle
    Kyle from Ingrams
    Posted on 4/16/2019

    The ductless MrCool DIY does need to be hard wired. The outside condenser should be wired to a disconnect box.

  • Efrain Lara
    Efrain Lara
    Posted on 5/8/2019

    What is the difference between a DIY unit and a professional installation needed one? What needa to be done that you need a professional to do?

  • Kyle
    Kyle from Ingrams
    Posted on 5/8/2019

    The MRCOOL DIY comes with special refrigerant lines that are pre-charged, sealed, and fitted with special "No-Vac" connections. This means that the unit can be installed without the necessity of brazing the lines, vacuuming them, and charging the unit. This makes installation simpler and faster.

  • Efrain Lara
    Efrain Lara
    Posted on 5/8/2019

    So that is the only things the unit has diferent? I cant decide on what tk get.

  • Kyle
    Kyle from Ingrams
    Posted on 5/9/2019

    That is the main difference, but that is a fairly significant difference.

  • Tyler
    Posted on 5/12/2019

    How big of a hole or pipe is needed to run the lines through the wall? I already installed a PVC pipe channel to the outside of my home from unfinished room over garage knowing I would get one of these one day.

  • Kyle
    Kyle from Ingrams
    Posted on 5/13/2019

    For most mini-splits, the hole needed to run the lines is not very big. It's typically only about a 3" diameter hole.

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