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Ranked by hot-day cooling efficiency only

Cooling efficiency on a 95°F afternoon. A single hot-weather test point, when air conditioners work hardest. Higher is more efficient. 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 hot-day cooling efficiency 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. 1MUZ-FX06NLHZ***with ductless indoor unit MSZ-FX06NLMitsubishi ElectricAlso listed as MUZ-FX06NLHZ20.5 tons · 6,000 Btu/h · DuctlessTop 10%21.5
  2. 2AOUH09KTAP1with ductless indoor unit ASUH09KTASFujitsu1 ton · 9,000 Btu/h · DuctlessTop 10%19.1
  3. 3AOUH09KZAH1with ductless indoor unit ASUH09KZASFujitsu1 ton · 9,000 Btu/h · DuctlessTop 10%18.8
  4. 4MUZ-FX09NLHZ***with ductless indoor unit MSZ-FX09NLMitsubishi ElectricAlso listed as MUZ-FX09NLHZ21 ton · 9,000 Btu/h · DuctlessTop 10%18.4
  5. 5AS-09UW3TBW00with ductless indoor unit AS-09UW3TBW**00HisenseAlso listed as AO-09U3T25P, AO-09U3T26P21 ton · 9,000 Btu/h · DuctlessTop 10%18.4
  6. 6MOX230-06HFN10-M1with ductless indoor unit MSEPB-06HRFN10-M1Midea (sold as MDV)0.5 tons · 6,000 Btu/h · DuctlessTop 10%18.1
  7. 7BMS500-AAS009-1CSXRDwith ductless indoor unit BMS500-AAU006-1AHWXDBosch0.5 tons · 6,000 Btu/h · DuctlessTop 10%18.1
  8. 837MAHAQ06AA3with ductless indoor unit 45MAHAQ06XA3CarrierAlso sold as Midea 37MAHAQ06AA3, Midea D5CSHAH06AAK, MDV MOX230-06HFN10-M1X, Arcoaire D5CSHAH06AAK0.5 tons · 6,000 Btu/h · DuctlessTop 10%18.0
  9. 9BZ33-HYP06OUT2-454-G3-Pwith ductless indoor unit BZ33-HYP06WALL2-454-G3-PBreeze330.5 tons · 6,000 Btu/h · DuctlessTop 10%18.0
  10. 10MO1HS-H06B-2Awith ductless indoor unit MSEHU-H06B-2AMidea0.5 tons · 6,000 Btu/h · DuctlessTop 10%18.0

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.

  • 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+

  • SEER2

    Summer-long cooling efficiency

    Cooling efficiency over a whole summer, measured with a federal test.

    Good
    21.4+
    Great
    23.5+
    Top 10%
    25.0+

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