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AUX vs York: heat pump ratings compared

Against heat pumps of the same size and type, a typical AUX model beats 49% and a typical York model 54%. York 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

York

54%

of similar heat pumps beaten by its typical model

About average

238 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%York: Beats 67%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FAUX: Beats 51%York: Beats 53%
  • Winter-long heating efficiencyHSPF2AUX: Beats 40%York: Beats 45%
  • Summer-long cooling efficiencySEER2AUX: Beats 48%York: Beats 40%
  • Hot-day cooling efficiencyEER2AUX: Beats 39%York: Beats 58%

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%
    York
    54%

  • Xcel CC

    AUX
    66%
    York
    41%

  • CEE Advanced

    AUX
    1%
    York
    8%

  • ENERGY STAR CC

    AUX
    35%
    York
    35%

Top cold-climate picks, ductless 3.5–4.5 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, 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 · 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
    2.05 (COP at 5°F)
    Good
    Seasonal efficiency
    10.3 (HSPF2)
    Good
    60.1score / 100
  2. 2AM5-H42/2DR3BAUX3.5 tons · 42,000 Btu/h · DuctlessKeeps 81% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    81% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.5 (HSPF2)
    Good
    50.7score / 100

York

  1. 1YPAS48BUFASDQ1with ductless indoor unit YPPFCB48UFA1DQYork3.5 tons · 42,000 Btu/h · DuctlessKeeps 83% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    83% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.8 (HSPF2)
    Great
    59.4score / 100
  2. 2UPC48CN23STG1with ductless indoor unit UNI48CS23STG1York (sold as Guardian)3.5 tons · 44,000 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)
    Top 10%
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.5 (HSPF2)
    Below the middle
    49.9score / 100
  3. 3YRAMX42N5HBAYork3.5 tons · 42,000 Btu/h · DuctlessKeeps 89% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    89% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.5 (HSPF2)
    Good
    46.2score / 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