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AUX vs COMFORTSTAR: heat pump ratings compared

Against heat pumps of the same size and type, a typical AUX model beats 52% and a typical COMFORTSTAR model 50%. AUX rates slightly higher overall.

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

AUX

52%

of similar heat pumps beaten by its typical model

About average

149 models listed

COMFORTSTAR

50%

of similar heat pumps beaten by its typical model

About average

133 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°FAUX: Beats 62%COMFORTSTAR: Beats 51%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAUX: Beats 51%COMFORTSTAR: Beats 48%
  • Winter-long heating efficiencyHSPF2AUX: Beats 43%COMFORTSTAR: Beats 54%
  • Summer-long cooling efficiencySEER2AUX: Beats 51%COMFORTSTAR: Beats 49%
  • Hot-day cooling efficiencyEER2AUX: Beats 40%COMFORTSTAR: Beats 44%

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

    AUX
    68%
    COMFORTSTAR
    53%

  • Xcel CC

    AUX
    63%
    COMFORTSTAR
    47%

  • CEE Advanced

    AUX
    1%
    COMFORTSTAR
    2%

  • ENERGY STAR CC

    AUX
    44%
    COMFORTSTAR
    30%

All-around best, ducted 5 tons and up

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

Showing Ducted, 5 tons and up (57,000 Btu/h and up cooling). What size is my system?

AUX

No ducted, 5 tons and up model from AUX.

COMFORTSTAR

  1. 1CPP3-60DU(O)with ducted air handler CPA3H-60DU(I)COMFORTSTAR5 tons · 58,000 Btu/h · DuctedNot a cold-climate pick: keeps 66% of its heat at 5°FMeets CEE 2025, CEE 2026
    Heat kept at 5°F
    67% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Great
    Winter efficiency
    9.7 (HSPF2)
    Top 10%
    Cooling efficiency
    17.0 (SEER2)
    Great
    Hot-day cooling
    10.0 (EER2)
    Below the middle
    65.3score / 100Heating 83 · Cooling 48
  2. 2CMZ3-62-6ZCOMFORTSTAR5 tons · 60,000 Btu/h · DuctedNot a cold-climate pick: keeps 66% of its heat at 5°FMeets CEE 2025, CEE 2026
    Heat kept at 5°F
    67% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Good
    Winter efficiency
    9.2 (HSPF2)
    Great
    Cooling efficiency
    18.0 (SEER2)
    Great
    Hot-day cooling
    10.0 (EER2)
    Below the middle
    62.5score / 100Heating 71 · Cooling 54

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