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EG4 vs OLMO: heat pump ratings compared

Against heat pumps of the same size and type, a typical EG4 model beats 66% and a typical OLMO model 43%. EG4 rates higher overall.

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

EG4

66%

of similar heat pumps beaten by its typical model

Well above average

11 models listed

OLMO

43%

of similar heat pumps beaten by its typical model

Below average

11 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°FEG4: Beats 76%OLMO: Beats 45%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FEG4: Beats 75%OLMO: Beats 40%
  • Winter-long heating efficiencyHSPF2EG4: Beats 72%OLMO: Beats 33%
  • Summer-long cooling efficiencySEER2EG4: Beats 58%OLMO: Beats 45%
  • Hot-day cooling efficiencyEER2EG4: Beats 65%OLMO: Beats 50%

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

    EG4
    73%
    OLMO
    91%

  • Xcel CC

    EG4
    73%
    OLMO
    55%

  • CEE Advanced

    EG4
    0%
    OLMO
    0%

  • ENERGY STAR CC

    EG4
    73%
    OLMO
    36%

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?

EG4

  1. 1DWLA4-ACDC1-12KR2(US)with ductless indoor unit DGLA4-ACDC1-12KR2(US)EG4Also listed as DWLA4-12KR2(US)1 ton · 11,000 Btu/h · DuctlessCold-climate pick, score 82.4Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    109% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.05 (COP at 5°F)
    Good
    Winter efficiency
    10.8 (HSPF2)
    Great
    Cooling efficiency
    21.5 (SEER2)
    Good
    Hot-day cooling
    12.8 (EER2)
    Good
    70.7score / 100Heating 82 · Cooling 59
  2. 2DWA5-ACDC-18KR2(US)with ductless indoor unit DGA5-ACDC-18KR2(US)EG41.5 tons · 17,000 Btu/h · DuctlessCold-climate pick, score 60.0Meets 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
    2.15 (COP at 5°F)
    Great
    Winter efficiency
    9.8 (HSPF2)
    Good
    Cooling efficiency
    21.0 (SEER2)
    Below the middle
    Hot-day cooling
    11.8 (EER2)
    Below the middle
    50.4score / 100Heating 60 · Cooling 41

OLMO

  1. 1OS-RMS18-230VOOLMO1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 69.5Meets 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
    1.99 (COP at 5°F)
    Good
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    22.0 (SEER2)
    Good
    Hot-day cooling
    13.3 (EER2)
    Great
    69.2score / 100Heating 70 · Cooling 69
  2. 2OS-SR09-230VOwith ductless indoor unit OS-09SRW-230VIOLMO1 ton · 9,000 Btu/h · DuctlessNot a cold-climate pick: keeps 60% of its heat at 5°FMeets CEE 2025, CEE 2026
    Heat kept at 5°F
    63% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Great
    Winter efficiency
    9.5 (HSPF2)
    Below the middle
    Cooling efficiency
    23.0 (SEER2)
    Good
    Hot-day cooling
    13.0 (EER2)
    Good
    56.7score / 100Heating 45 · Cooling 68
  3. 3OS-SR18-230VOwith ductless indoor unit OS-18SRW-230VIOLMO1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 69.0Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.49 (COP at 5°F)
    Top 10%
    Winter efficiency
    9.8 (HSPF2)
    Good
    Cooling efficiency
    21.0 (SEER2)
    Below the middle
    Hot-day cooling
    12.0 (EER2)
    Below the middle
    55.3score / 100Heating 69 · Cooling 42

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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