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Cowsar vs Kerr Kapstone: heat pump ratings compared

Against heat pumps of the same size and type, a typical Cowsar model beats 34% and a typical Kerr Kapstone model 73%. Kerr Kapstone rates higher overall.

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

Cowsar

34%

of similar heat pumps beaten by its typical model

Well below average

12 models listed

Kerr Kapstone

73%

of similar heat pumps beaten by its typical model

Well above average

12 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°FCowsar: Beats 61%Kerr Kapstone: Beats 56%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FCowsar: Beats 28%Kerr Kapstone: Beats 84%
  • Winter-long heating efficiencyHSPF2Cowsar: Beats 25%Kerr Kapstone: Beats 85%
  • Summer-long cooling efficiencySEER2Cowsar: Beats 36%Kerr Kapstone: Beats 77%
  • Hot-day cooling efficiencyEER2Cowsar: Beats 23%Kerr Kapstone: Beats 70%

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

    Cowsar
    75%
    Kerr Kapstone
    92%

  • Xcel CC

    Cowsar
    50%
    Kerr Kapstone
    100%

  • CEE Advanced

    Cowsar
    0%
    Kerr Kapstone
    0%

  • ENERGY STAR CC

    Cowsar
    0%
    Kerr Kapstone
    100%

Top cold-climate picks, ducted 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 Ducted, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

Cowsar

No ducted, up to 1.5 tons model from Cowsar.

Kerr Kapstone

  1. 1A-KZP15SA-1with ducted air handler B-KZP15SA-1Kerr Kapstone1.5 tons · 15,000 Btu/h · DuctedKeeps 90% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    90% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    11.0 (HSPF2)
    Top 10%
    75.1score / 100
  2. 2A-KX12P18SA-1with ducted air handler MXP18/24A1AKerr Kapstone1.5 tons · 18,000 Btu/h · DuctedKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    95% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.06 (COP at 5°F)
    Good
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    72.8score / 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