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KeplerX vs TKS: heat pump ratings compared

Against heat pumps of the same size and type, a typical KeplerX model beats 42% and a typical TKS model 31%. KeplerX rates higher overall.

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

KeplerX

42%

of similar heat pumps beaten by its typical model

Below average

20 models listed

TKS

31%

of similar heat pumps beaten by its typical model

Well below average

8 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°FKeplerX: Beats 34%TKS: Beats 23%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FKeplerX: Beats 41%TKS: Beats 43%
  • Winter-long heating efficiencyHSPF2KeplerX: Beats 52%TKS: Beats 16%
  • Summer-long cooling efficiencySEER2KeplerX: Beats 58%TKS: Beats 35%
  • Hot-day cooling efficiencyEER2KeplerX: Beats 26%TKS: Beats 36%

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

    KeplerX
    35%
    TKS
    75%

  • Xcel CC

    KeplerX
    25%
    TKS
    100%

  • CEE Advanced

    KeplerX
    0%
    TKS
    0%

  • ENERGY STAR CC

    KeplerX
    0%
    TKS
    0%

All-around best, ductless 2.5–3 tons

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

Showing Ductless, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?

KeplerX

No ductless, 2.5–3 tons model from KeplerX.

TKS

  1. 1TWSG-3619SR32Owith ductless indoor unit TWSG-3619SR32ITKS3 tons · 33,600 Btu/h · DuctlessCold-climate pick, score 22.3Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    72% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Winter efficiency
    8.5 (HSPF2)
    Below the middle
    Cooling efficiency
    21.0 (SEER2)
    Below the middle
    Hot-day cooling
    12.0 (EER2)
    Good
    37.0score / 100Heating 22 · Cooling 52
  2. 2TWSG-3019SR32Owith ductless indoor unit TWSG-3019SR32ITKS2.5 tons · 30,000 Btu/h · DuctlessCold-climate pick, score 28.4Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    77% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Winter efficiency
    9.0 (HSPF2)
    Below the middle
    Cooling efficiency
    22.0 (SEER2)
    Good
    Hot-day cooling
    11.0 (EER2)
    Below the middle
    35.9score / 100Heating 28 · Cooling 43

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