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How cold can a ducted or ductless minisplit handle?

user-4053553 | Posted in Energy Efficiency and Durability on

I am curious at what temperature they can work down to and what kind of efficiency one would see at those temperatures?

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Replies

    1. user-4053553 | | #2

      Very interesting, thanks.
      Also in this thread Dana says
      "There are a few mini-splits fully specified down to -22F/-30C, and many specified down to -13F/-25C, even more specified at -20C."
      https://www.greenbuildingadvisor.com/question/best-heat-source-for-this-house#comment-164306

  1. Expert Member
    Dana Dorsett | | #3

    >"...and what kind of efficiency one would see at those temperatures?"

    The COP of a cold climate mini-split runing balls to the walls fully maxed out speed at 0F will be in the 1.5-2 range, maybe a hair higher than 2 at 0F if it's modulating rather than maxed out. At full speed at whatever it's lowest specified temperature is, figure COP 1.5-ish. Below that temp it'll still be delivering heat, but at a somewhat lower COP too.

    R410A refrigerant heat pumps don't have any capacity to speak of (at any efficiency) at temps below about -35F/-37C, due to the nature of the refrigerant at the operating pressures used, which makes them a poor fit as the sole heating source for an Arctic Ocean beachfront cabin. Even at atmospheric pressure it condenses at -46F/-51C.

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