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ABCOOLAIR vs SUM X: heat pump ratings compared

Against heat pumps of the same size and type, a typical ABCOOLAIR model beats 58% and a typical SUM X model 73%. SUM X rates higher overall.

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

ABCOOLAIR

58%

of similar heat pumps beaten by its typical model

Above average

6 models listed

SUM X

73%

of similar heat pumps beaten by its typical model

Well above average

6 models listed

Rating by ratingEach bar is the share of same-size, same-type heat pumps that a typical model beats, so the two brands compare fairly even if they make different sizes.
  • Efficiency on a 5°F dayCOP at 5°FABCOOLAIR: Beats 52%SUM X: Beats 78%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FABCOOLAIR: Beats 29%SUM X: Beats 80%
  • Winter-long heating efficiencyHSPF2ABCOOLAIR: Beats 55%SUM X: Beats 70%
  • Summer-long cooling efficiencySEER2ABCOOLAIR: Beats 51%SUM X: Beats 79%
  • Hot-day cooling efficiencyEER2ABCOOLAIR: Beats 91%SUM X: Beats 61%

Average (50%)Dashed outline: the other brand, for comparison

Want ranks, distributions per size class and cold-weather curves? Switch to Advanced

Rebate standards

Share of each brand’s models that meet the level. Programs can have other rules too.

  • CEE 2025

    ABCOOLAIR
    50%
    SUM X
    100%

  • Xcel CC

    ABCOOLAIR
    0%
    SUM X
    100%

  • CEE Advanced

    ABCOOLAIR
    0%
    SUM X
    0%

  • ENERGY STAR CC

    ABCOOLAIR
    0%
    SUM X
    100%

All-around best, ductless up to 1.5 tons

Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.

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

ABCOOLAIR

No ductless, up to 1.5 tons model from ABCOOLAIR.

SUM X

  1. 1SM-12HSM2-CUwith ductless indoor unit SM-12HSM2-WUSUM X1 ton · 12,000 Btu/h · DuctlessCold-climate pick, score 60.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    88% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    9.5 (HSPF2)
    Below the middle
    Cooling efficiency
    23.0 (SEER2)
    Good
    Hot-day cooling
    12.3 (EER2)
    Good
    60.0score / 100Heating 60 · Cooling 60
  2. 2SM-18HSM2-CUwith ductless indoor unit SM-18HSM2-WUSUM X1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 58.5Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Winter efficiency
    9.5 (HSPF2)
    Below the middle
    Cooling efficiency
    21.0 (SEER2)
    Below the middle
    Hot-day cooling
    12.1 (EER2)
    Below the middle
    52.4score / 100Heating 59 · Cooling 46

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

Next steps

The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.

Open the advanced view