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AUX vs Lennox: heat pump ratings compared

Against heat pumps of the same size and type, a typical AUX model beats 49% and a typical Lennox model 48%. AUX rates slightly higher overall.

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

AUX

49%

of similar heat pumps beaten by its typical model

About average

189 models listed

Lennox

48%

of similar heat pumps beaten by its typical model

About average

337 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 60%Lennox: Beats 46%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAUX: Beats 51%Lennox: Beats 44%
  • Winter-long heating efficiencyHSPF2AUX: Beats 40%Lennox: Beats 44%
  • Summer-long cooling efficiencySEER2AUX: Beats 48%Lennox: Beats 45%
  • Hot-day cooling efficiencyEER2AUX: Beats 39%Lennox: Beats 57%

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%
    Lennox
    44%

  • Xcel CC

    AUX
    66%
    Lennox
    36%

  • CEE Advanced

    AUX
    1%
    Lennox
    3%

  • ENERGY STAR CC

    AUX
    35%
    Lennox
    30%

All-around best, ducted 3.5–4.5 tons

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

Showing Ducted, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

AUX

  1. 1ASUM42HPMULOAUX3.5 tons · 42,000 Btu/h · DuctedCold-climate pick, score 77.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    83% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Good
    Winter efficiency
    10.0 (HSPF2)
    Great
    Cooling efficiency
    22.0 (SEER2)
    Top 10%
    Hot-day cooling
    12.3 (EER2)
    Top 10%
    87.2score / 100Heating 77 · Cooling 97
  2. 2AHU48HPV1BOwith ducted air handler AHU48HPV1BIAUX4 tons · 48,000 Btu/h · DuctedCold-climate pick, score 76.5Meets 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
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    9.5 (HSPF2)
    Great
    Cooling efficiency
    17.0 (SEER2)
    Good
    Hot-day cooling
    10.0 (EER2)
    Below the middle
    60.2score / 100Heating 77 · Cooling 44
  3. 3AHU60HPV1BOwith ducted air handler AHU60HPV1BIAUX4.5 tons · 55,000 Btu/h · DuctedCold-climate pick, score 71.2Meets ENERGY STAR CC
    Heat kept at 5°F
    87% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    9.5 (HSPF2)
    Great
    Cooling efficiency
    16.5 (SEER2)
    Good
    Hot-day cooling
    9.5 (EER2)
    Below the middle
    54.6score / 100Heating 71 · Cooling 38

Lennox

  1. 1SL22KLV-048-230A**with indoor coil CK40[C,U]T-60C-**+TDR and furnace SL280UH080NV60CLennox4 tons · 46,000 Btu/h · DuctedCold-climate pick, score 84.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    98% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.02 (COP at 5°F)
    Good
    Winter efficiency
    9.4 (HSPF2)
    Great
    Cooling efficiency
    20.5 (SEER2)
    Top 10%
    Hot-day cooling
    12.4 (EER2)
    Top 10%
    86.5score / 100Heating 76 · Cooling 97
  2. 2A-VHP486A-1Lennox (sold as Comfort-Aire)4 tons · 47,000 Btu/h · DuctedCold-climate pick, score 82.6Meets 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
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    11.0 (HSPF2)
    Top 10%
    Cooling efficiency
    20.4 (SEER2)
    Top 10%
    Hot-day cooling
    11.7 (EER2)
    Great
    84.2score / 100Heating 83 · Cooling 86
  3. 3EL21KLV-048-230A**with indoor coil CK40[C,U]T-60C-**+TDR and furnace EL280UH110E48CLennoxAlso sold as Armstrong Air A7CP21V48P-**A4 tons · 47,500 Btu/h · DuctedCold-climate pick, score 73.3Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    73% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.14 (COP at 5°F)
    Great
    Winter efficiency
    9.6 (HSPF2)
    Great
    Cooling efficiency
    20.5 (SEER2)
    Top 10%
    Hot-day cooling
    12.2 (EER2)
    Top 10%
    84.2score / 100Heating 72 · Cooling 97

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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