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KERR vs Wells: heat pump ratings compared

Against heat pumps of the same size and type, a typical KERR model beats 66% and a typical Wells model 57%. KERR rates higher overall.

Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated

KERR

66%

of similar heat pumps beaten by its typical model

Well above average

24 models listed

Wells

57%

of similar heat pumps beaten by its typical model

Above average

35 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°FKERR: Beats 49%Wells: Beats 40%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FKERR: Beats 78%Wells: Beats 60%
  • Winter-long heating efficiencyHSPF2KERR: Beats 76%Wells: Beats 70%
  • Summer-long cooling efficiencySEER2KERR: Beats 68%Wells: Beats 65%
  • Hot-day cooling efficiencyEER2KERR: Beats 58%Wells: Beats 50%

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

    KERR
    83%
    Wells
    74%

  • Xcel CC

    KERR
    79%
    Wells
    60%

  • CEE Advanced

    KERR
    8%
    Wells
    0%

  • ENERGY STAR CC

    KERR
    88%
    Wells
    60%

Top cold-climate picks, ductless up to 1.5 tons

Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.

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

KERR

  1. 1A-KMH06SV-1with ductless indoor unit B-KMH06SV-1KERR0.5 tons · 6,000 Btu/h · DuctlessKeeps 107% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    107% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.09 (COP at 5°F)
    Great
    Seasonal efficiency
    13.6 (HSPF2)
    Top 10%
    89.3score / 100
  2. 2A-KMH12SV-1with ductless indoor unit B-KMH12FV-1KERR1 ton · 12,000 Btu/h · DuctlessKeeps 99% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    99% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.99 (COP at 5°F)
    Good
    Seasonal efficiency
    10.7 (HSPF2)
    Great
    77.0score / 100
  3. 3A-KMH09SV-1with ductless indoor unit B-KMH09SV-1KERR1 ton · 9,000 Btu/h · DuctlessKeeps 88% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    88% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.97 (COP at 5°F)
    Good
    Seasonal efficiency
    11.5 (HSPF2)
    Top 10%
    76.2score / 100

Wells

  1. 1WSA-09HFMOwith ductless indoor unit WSA-09HFMIWells1 ton · 9,000 Btu/h · DuctlessKeeps 94% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    94% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.90 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    11.6 (HSPF2)
    Top 10%
    74.8score / 100
  2. 2WSA-06HFMOwith ductless indoor unit WSA-06HFMIWells0.5 tons · 6,000 Btu/h · DuctlessKeeps 101% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    101% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.84 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    12.0 (HSPF2)
    Top 10%
    74.6score / 100
  3. 3WSA-18HFMOwith ductless indoor unit WSA-18HFMIWells1.5 tons · 18,000 Btu/h · DuctlessKeeps 96% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    96% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.89 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.6 (HSPF2)
    Great
    70.3score / 100

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