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

AUX

  1. 1AM4-H36/2DR3BAUXAlso listed as ASUM36HPMULO3 tons · 36,000 Btu/h · DuctlessKeeps 92% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    92% (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%
    73.2score / 100
  2. 2ASPR30HPMULOAUX2.5 tons · 30,000 Btu/h · DuctlessKeeps 79% of its heat at 5°FMeets 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
    2.05 (COP at 5°F)
    Great
    Seasonal efficiency
    9.8 (HSPF2)
    Below the middle
    62.1score / 100
  3. 3ASPR36HPMULOAUX3 tons · 36,000 Btu/h · DuctlessKeeps 71% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.05 (COP at 5°F)
    Great
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    59.2score / 100

COMFORTSTAR

  1. 1CHF3-36DU(O)with ductless indoor unit FPA3-36DU(I)COMFORTSTAR3 tons · 36,400 Btu/h · DuctlessKeeps 104% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    104% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.02 (COP at 5°F)
    Great
    Seasonal efficiency
    10.8 (HSPF2)
    Top 10%
    89.4score / 100
  2. 2CVH3-36-5SHCOMFORTSTAR3 tons · 36,000 Btu/h · DuctlessKeeps 104% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    104% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.95 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.9 (HSPF2)
    Top 10%
    72.6score / 100
  3. 3CPP3-36DU(O)with ductless indoor unit TIP3-36DU(I)COMFORTSTAR3 tons · 36,000 Btu/h · DuctlessKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    70% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.3 (HSPF2)
    Good
    62.8score / 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