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Proair vs WILLIS: heat pump ratings compared

Against heat pumps of the same size and type, a typical Proair model beats 52% and a typical WILLIS model 63%. WILLIS rates higher overall.

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

Proair

52%

of similar heat pumps beaten by its typical model

About average

30 models listed

WILLIS

63%

of similar heat pumps beaten by its typical model

Well above average

29 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°FProair: Beats 49%WILLIS: Beats 44%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FProair: Beats 55%WILLIS: Beats 71%
  • Winter-long heating efficiencyHSPF2Proair: Beats 59%WILLIS: Beats 50%
  • Summer-long cooling efficiencySEER2Proair: Beats 55%WILLIS: Beats 69%
  • Hot-day cooling efficiencyEER2Proair: Beats 44%WILLIS: Beats 72%

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

    Proair
    70%
    WILLIS
    97%

  • Xcel CC

    Proair
    67%
    WILLIS
    97%

  • CEE Advanced

    Proair
    0%
    WILLIS
    10%

  • ENERGY STAR CC

    Proair
    0%
    WILLIS
    86%

All-around best, ductless 2 tons

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

Showing Ductless, 2 tons (21,000–26,999 Btu/h cooling). What size is my system?

Proair

  1. 1PMUL-A4P-27HP-MProair2 tons · 26,000 Btu/h · DuctlessCold-climate pick, score 41.1Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    70% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    9.5 (HSPF2)
    Below the middle
    Cooling efficiency
    23.0 (SEER2)
    Great
    Hot-day cooling
    12.2 (EER2)
    Good
    56.7score / 100Heating 41 · Cooling 72
  2. 2POX21-24HFN10-Mwith ductless indoor unit PSAG-24HWM-MProair2 tons · 24,000 Btu/h · DuctlessCold-climate pick, score 45.1Meets Xcel CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.11 (COP at 5°F)
    Great
    Winter efficiency
    9.0 (HSPF2)
    Below the middle
    Cooling efficiency
    18.5 (SEER2)
    Below the middle
    Hot-day cooling
    9.6 (EER2)
    Below the middle
    29.2score / 100Heating 45 · Cooling 13

WILLIS

  1. 1PUHW24KR32-Owith ductless indoor unit PUHW24KR32-IWILLIS2 tons · 22,000 Btu/h · DuctlessCold-climate pick, score 70.3Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    79% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.11 (COP at 5°F)
    Great
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    26.0 (SEER2)
    Top 10%
    Hot-day cooling
    13.7 (EER2)
    Top 10%
    82.1score / 100Heating 70 · Cooling 94
  2. 2AUHW24KR32-Owith ductless indoor unit AUHW24KR32-IWILLIS2 tons · 22,000 Btu/h · DuctlessCold-climate pick, score 60.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    27.0 (SEER2)
    Top 10%
    Hot-day cooling
    14.0 (EER2)
    Top 10%
    78.1score / 100Heating 60 · Cooling 96
  3. 3MZUHW24KR32-OWILLIS2 tons · 24,000 Btu/h · DuctlessCold-climate pick, score 67.5Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    90% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    21.0 (SEER2)
    Below the middle
    Hot-day cooling
    13.3 (EER2)
    Great
    67.6score / 100Heating 68 · Cooling 68

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.

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