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Ranked by efficiency on a 5°f day only

How much heat the unit makes from each unit of electricity when it is 5°F outside. An electric baseboard heater has a COP of 1, so a COP of 2 means twice the heat from the same electricity in the 5°F test. This list ranks by that one rating. For the units that hold up best in the cold overall, see the cold-climate picks.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated

Showing Ductless, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

Top 10 by efficiency on a 5°f day only: ductless, up to 1.5 tons

Ranked by this one rating, not an overall verdict. Every model here is the same size and type, so the numbers compare directly. Higher is better. One certified pairing per model.
  1. 1SUZ-AA09NL***with ductless indoor unit MLZ-KX09NLMitsubishi Electric1 ton · 9,000 Btu/h · DuctlessTop 10%2.98
  2. 2SUZ-AA15NL***with ductless indoor unit MSZ-EX15NLBMitsubishi Electric1.5 tons · 15,000 Btu/h · DuctlessTop 10%2.84
  3. 3SUZ-CA15NLH***with ductless indoor unit MFZ-KX15NLMitsubishi Electric1.5 tons · 15,000 Btu/h · DuctlessTop 10%2.79
  4. 4SUZ-AA18NL***with ductless indoor unit MSZ-EX18NLBMitsubishi Electric1.5 tons · 16,400 Btu/h · DuctlessTop 10%2.75
  5. 5SUZ-CA09NLH***with ductless indoor unit MFZ-KX09NLMitsubishi Electric1 ton · 9,000 Btu/h · DuctlessTop 10%2.67
  6. 6AOUH12KTAP1with ductless indoor unit ASUH12KTABFujitsu1 ton · 12,000 Btu/h · DuctlessTop 10%2.62
  7. 7YPAS18BUFASDQ1with ductless indoor unit YPCIB18UFA1DQYork1.5 tons · 18,000 Btu/h · DuctlessTop 10%2.60
  8. 8AOUH15KTAP1with ductless indoor unit ASUH15KTABFujitsu1 ton · 14,500 Btu/h · DuctlessTop 10%2.54
  9. 9AST-18UW3RXW00with ductless indoor unit AST-18UW3RXW**00HisenseAlso listed as AO-18U3R25E1.5 tons · 18,000 Btu/h · DuctlessTop 10%2.53
  10. 10WHS18SZB21Swith ductless indoor unit WHS18WMB21SNortek Global HVAC (sold as Westinghouse)1.5 tons · 18,000 Btu/h · DuctlessTop 10%2.53

Every ductless, up to 1.5 tons model, highest first

Top cold-climate picks, ductless up to 1.5 tons

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

Want this size class’s full distribution and peer percentiles? Switch to Advanced

What good looks like: ductless, up to 1.5 tons

Good is better than half of this size class, great is the top quarter, top is the top 10%. The scale comes from the class’s own ratings.

  • Capacity at 5°F vs 47°F

    Heating power kept at 5°F

    How much of its mild-weather heating power the unit still delivers at 5°F.

    Good
    76%+
    Great
    91%+
    Top 10%
    100%+

  • COP at 5°F

    Efficiency on a 5°F day

    How much heat the unit makes from each unit of electricity when it is 5°F outside.

    Good
    1.95+
    Great
    2.10+
    Top 10%
    2.25+

  • HSPF2

    Winter-long heating efficiency

    Heating efficiency over a whole winter, measured with a federal test.

    Good
    9.5+
    Great
    10.2+
    Top 10%
    11.4+

Next steps

The advanced view adds the all-sizes boards, each qualifier’s peer percentiles, charts of every model in each size class, and the EER2 and heat output boards.

Open the advanced view