Skip to content
Rebate.Blue

DIYCOOL vs ZERO: heat pump ratings compared

Against heat pumps of the same size and type, a typical DIYCOOL model beats 54% and a typical ZERO model 53%. DIYCOOL rates slightly higher overall.

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

DIYCOOL

54%

of similar heat pumps beaten by its typical model

About average

24 models listed

ZERO

53%

of similar heat pumps beaten by its typical model

About average

119 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°FDIYCOOL: Beats 53%ZERO: Beats 45%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FDIYCOOL: Beats 51%ZERO: Beats 52%
  • Winter-long heating efficiencyHSPF2DIYCOOL: Beats 63%ZERO: Beats 57%
  • Summer-long cooling efficiencySEER2DIYCOOL: Beats 60%ZERO: Beats 58%
  • Hot-day cooling efficiencyEER2DIYCOOL: Beats 47%ZERO: Beats 48%

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

    DIYCOOL
    79%
    ZERO
    71%

  • Xcel CC

    DIYCOOL
    71%
    ZERO
    65%

  • CEE Advanced

    DIYCOOL
    4%
    ZERO
    0%

  • ENERGY STAR CC

    DIYCOOL
    75%
    ZERO
    53%

All-around best, ductless up to 1.5 tons

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

Showing Ductless, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

DIYCOOL

  1. 1EZ-18ZPL-HP230Bwith ductless indoor unit EZ-18W-MBDIYCOOL1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 73.1Meets 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
    2.44 (COP at 5°F)
    Top 10%
    Winter efficiency
    11.5 (HSPF2)
    Top 10%
    Cooling efficiency
    22.5 (SEER2)
    Good
    Hot-day cooling
    13.7 (EER2)
    Great
    73.3score / 100Heating 73 · Cooling 73
  2. 2EZ-18Z-M2BDIYCOOL1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 66.8Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    74% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.31 (COP at 5°F)
    Top 10%
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    23.9 (SEER2)
    Great
    Hot-day cooling
    13.0 (EER2)
    Good
    70.7score / 100Heating 67 · Cooling 75
  3. 3EZ-12ZPL-HP115Bwith ductless indoor unit EZ-12WPL-HP115BDIYCOOL1 ton · 12,000 Btu/h · DuctlessCold-climate pick, score 57.5Meets 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
    2.09 (COP at 5°F)
    Good
    Winter efficiency
    10.2 (HSPF2)
    Great
    Cooling efficiency
    23.5 (SEER2)
    Great
    Hot-day cooling
    12.5 (EER2)
    Good
    62.0score / 100Heating 58 · Cooling 67

ZERO

  1. 1ZMSB-09HV-USHHR2-Owith ductless indoor unit ZMSB-09HV-USHHR2-IZERO1 ton · 9,000 Btu/h · DuctlessCold-climate pick, score 85.9Meets 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%
    Winter efficiency
    13.0 (HSPF2)
    Top 10%
    Cooling efficiency
    24.6 (SEER2)
    Great
    Hot-day cooling
    14.7 (EER2)
    Top 10%
    86.7score / 100Heating 86 · Cooling 87
  2. 2ZMSB-09HV-USHHCR2-Owith ductless indoor unit ZMSB-09HV-USHHCR2-IZERO1 ton · 9,000 Btu/h · DuctlessCold-climate pick, score 65.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    96% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    1.80 (COP at 5°F)
    Below the middle
    Winter efficiency
    12.5 (HSPF2)
    Top 10%
    Cooling efficiency
    26.0 (SEER2)
    Top 10%
    Hot-day cooling
    15.0 (EER2)
    Top 10%
    79.5score / 100Heating 65 · Cooling 94
  3. 3ZMSB-18HV-USHHR2-Owith ductless indoor unit ZMSB-18HV-USHHR2-IZERO1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 73.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    72% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.35 (COP at 5°F)
    Top 10%
    Winter efficiency
    11.1 (HSPF2)
    Great
    Cooling efficiency
    24.0 (SEER2)
    Great
    Hot-day cooling
    13.5 (EER2)
    Great
    76.6score / 100Heating 73 · Cooling 80

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