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A ductless mini split system can be a very beneficial upgrade to your home HVAC system, and a handy homeowner may be tempted to handle ductless mini split installation by himself. However, this isn’t a good idea if you want to be secure in knowing crucial installation steps were handled correctly. On the other hand, there are things you can do as part of installation that can defray some of the installation expense. For safety and a better end result, find out the parts of the installation of your ductless system you can do yourself (and which steps to leave to the pros).


Ductless mini splits are easier to install than central split-system heat pumps, but more difficult to install than the old-fashioned window units. While the refrigeration principle ductless systems use for heating and cooling is simple, the components that drive efficient heat energy transfer are complex and sophisticated, requiring the expertise of a certified HVAC professional for each leg of the installation.

Rather than ending up frustrated with a voided warranty, and spending more for the self-install repair than for actual professional installation, stick to these practical and time-saving steps:

  • Grab a partner and place the outside unit into position.
  • A firm surface is required, such as a small concrete slab, which you may pour yourself. Bricks and paver stones may also be used.
  • A small hole in the exterior wall of the home is going to be needed for the conduit to pass through. (Use extreme caution to avoid electrical components.)
  • If you feel comfortable, you may route the conduit through the wall, depending on the complexity of the installation. For instance, if the conduit needs to traverse several feet (one or more rooms’ distance) through crawl space, attic space or inside walls, you may want to leave it to the professional to not risk damage to the condensate and refrigerant lines inside.
  • Place the air-handling unit inside near its installation location. Clear away any obstacles that may hinder installation, such as furniture.

The professional portion of the installation involves hooking up electrical components, and a complete systems diagnostics (testing sensors, refrigerant charge, modes, fans, air filtration, test for leaks and more). If anything is wrong, you are covered.

To learn more about installation of ductless mini splits for your Treasure Coast home, please contact us at NisAir Air Conditioning and Heating.