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Community and Q&A

Are minisplit refrigerant lines better in a wall or outside?

Michael Prisco | Posted in Mechanicals on

Will the heating efficiency of a mini split operating in a cold climate be effected by whether the refrigerant lines are run inside the walls and kept warmer vs running them down a chase on the outside?


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  1. GBA Editor
    Martin Holladay | | #1

    Wherever they are located, refrigerant lines need to be insulated.

    It stands to reason that if refrigerant lines can be installed inside a home's thermal envelope, there will be a slight performance improvement compared to refrigerant lines installed outside a home's thermal envelope.

    My guess is that the difference in performance or efficiency will be slight, however.

  2. Expert Member
    Dana Dorsett | | #2

    The difference in efficiency is "in the noise", statistically speaking. With an exterior conduit it's easier to service, and there is less likelihood of pounding a nail or drilling through when hanging things on the wall later.

    In new construction routing them in an interior chase (and not stud cavities) would be the best choice.

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