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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%

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?

AUX

  1. 1AM2-H18/2DR3BAUXAlso listed as ASUM18HPMULO1.5 tons · 18,000 Btu/h · DuctlessKeeps 121% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    121% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    11.0 (HSPF2)
    Great
    82.7score / 100
  2. 2ASW-H18E3B2/*R3DI-D2with ductless indoor unit ASW-H18E3B2/*R3DI-D2AUXAlso listed as ASW-H18E3B2/**R3DI-D21.5 tons · 18,000 Btu/h · DuctlessKeeps 82% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    82% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.25 (COP at 5°F)
    Great
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    79.2score / 100
  3. 3AMAR18HP230V1COwith ductless indoor unit AMAR18HP230V1CHAUX1.5 tons · 18,000 Btu/h · DuctlessKeeps 85% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    85% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.21 (COP at 5°F)
    Great
    Seasonal efficiency
    10.2 (HSPF2)
    Great
    77.2score / 100

COMFORTSTAR

  1. 1CHF3-06CD(O)with ductless indoor unit T1W3-06CD(I)COMFORTSTAR0.5 tons · 6,500 Btu/h · DuctlessKeeps 109% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
    Heat kept at 5°F
    109% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.40 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    12.0 (HSPF2)
    Top 10%
    94.4score / 100
  2. 2CPP3-09CD(O)with ductless indoor unit CPP3-09CD(I)COMFORTSTAR1 ton · 9,000 Btu/h · DuctlessKeeps 82% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    82% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.33 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    13.0 (HSPF2)
    Top 10%
    85.9score / 100
  3. 3CHF3-18CD(O)with ductless indoor unit CPP3-18CD(I)COMFORTSTAR1.5 tons · 18,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    10.8 (HSPF2)
    Great
    78.3score / 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.

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