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ACD vs ZEPHYR: heat pump ratings compared

Against heat pumps of the same size and type, a typical ACD model beats 51% and a typical ZEPHYR model 58%. ZEPHYR rates higher overall.

Covers older R-410A heat pumps, no longer installed new. See models sold today · Updated

ACD

51%

of similar heat pumps beaten by its typical model

About average

25 models listed

ZEPHYR

58%

of similar heat pumps beaten by its typical model

Above average

25 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°FACD: Beats 36%ZEPHYR: Beats 40%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FACD: Beats 69%ZEPHYR: Beats 68%
  • Winter-long heating efficiencyHSPF2ACD: Beats 47%ZEPHYR: Beats 43%
  • Summer-long cooling efficiencySEER2ACD: Beats 53%ZEPHYR: Beats 53%
  • Hot-day cooling efficiencyEER2ACD: Beats 51%ZEPHYR: Beats 52%

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

    ACD
    88%
    ZEPHYR
    76%

  • Xcel CC

    ACD
    88%
    ZEPHYR
    76%

  • CEE Advanced

    ACD
    0%
    ZEPHYR
    0%

  • ENERGY STAR CC

    ACD
    72%
    ZEPHYR
    36%

Top cold-climate picks, ductless 2 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 tons (21,000–26,999 Btu/h cooling). What size is my system?

ACD

  1. 1MPD24KCH21SB-OACD2 tons · 23,200 Btu/h · DuctlessKeeps 90% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    90% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Great
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    76.1score / 100
  2. 2UHD24KCH22S-Owith ductless indoor unit UHD24KCH22S-IACD2 tons · 22,000 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
    1.90 (COP at 5°F)
    Good
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    68.5score / 100
  3. 3MUD24KCH23S-OACD2 tons · 22,000 Btu/h · DuctlessKeeps 115% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    115% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    66.1score / 100

ZEPHYR

  1. 1ZE-24CA22SEXTwith ductless indoor unit ZE-24CA22SINTZEPHYR2 tons · 23,000 Btu/h · DuctlessKeeps 89% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    89% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.13 (COP at 5°F)
    Great
    Seasonal efficiency
    8.6 (HSPF2)
    Below the middle
    64.0score / 100
  2. 2ZE-24M322SCOZEPHYR2 tons · 24,000 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
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.1 (HSPF2)
    Good
    56.8score / 100
  3. 3ZE-24UH24SCOwith ductless indoor unit ZE-24UH24SCIZEPHYR2 tons · 24,000 Btu/h · DuctlessKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    95% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.76 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    55.6score / 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