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Custom Comfort vs OLMO: heat pump ratings compared

Against heat pumps of the same size and type, a typical Custom Comfort model beats 71% and a typical OLMO model 43%. Custom Comfort rates higher overall.

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

Custom Comfort

71%

of similar heat pumps beaten by its typical model

Well above average

28 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°FCustom Comfort: Beats 64%OLMO: Beats 45%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FCustom Comfort: Beats 71%OLMO: Beats 40%
  • Winter-long heating efficiencyHSPF2Custom Comfort: Beats 84%OLMO: Beats 33%
  • Summer-long cooling efficiencySEER2Custom Comfort: Beats 69%OLMO: Beats 45%
  • Hot-day cooling efficiencyEER2Custom Comfort: Beats 67%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

    Custom Comfort
    96%
    OLMO
    91%

  • Xcel CC

    Custom Comfort
    100%
    OLMO
    55%

  • CEE Advanced

    Custom Comfort
    4%
    OLMO
    0%

  • ENERGY STAR CC

    Custom Comfort
    100%
    OLMO
    36%

All-around best, ductless 2.5–3 tons

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

Showing Ductless, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?

Custom Comfort

  1. 1CCOXHBMZ536HPCustom Comfort3 tons · 36,000 Btu/h · DuctlessCold-climate pick, score 78.0Meets 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
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    10.7 (HSPF2)
    Great
    Cooling efficiency
    23.0 (SEER2)
    Great
    Hot-day cooling
    13.0 (EER2)
    Great
    78.3score / 100Heating 76 · Cooling 81
  2. 2CCOXHBMZ427HPCustom Comfort2.5 tons · 27,000 Btu/h · DuctlessCold-climate pick, score 72.9Meets 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
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    10.5 (HSPF2)
    Great
    Cooling efficiency
    23.0 (SEER2)
    Great
    Hot-day cooling
    12.5 (EER2)
    Great
    74.4score / 100Heating 73 · Cooling 76
  3. 3CCOESBMZ427HPCustom Comfort2.5 tons · 27,000 Btu/h · DuctlessCold-climate pick, score 41.4Meets 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
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    9.5 (HSPF2)
    Below the middle
    Cooling efficiency
    25.0 (SEER2)
    Top 10%
    Hot-day cooling
    13.0 (EER2)
    Great
    66.3score / 100Heating 41 · Cooling 91

OLMO

  1. 1OS-RMS27-230VOOLMO2.5 tons · 27,000 Btu/h · DuctlessCold-climate pick, score 50.2Meets 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
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    23.0 (SEER2)
    Great
    Hot-day cooling
    12.9 (EER2)
    Great
    64.2score / 100Heating 50 · Cooling 78
  2. 2OS-RMS36-230VOOLMO3 tons · 36,000 Btu/h · DuctlessCold-climate pick, score 53.7Meets 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)
    Below the middle
    Winter efficiency
    10.0 (HSPF2)
    Good
    Cooling efficiency
    22.0 (SEER2)
    Good
    Hot-day cooling
    12.9 (EER2)
    Great
    61.7score / 100Heating 54 · Cooling 70
  3. 3OS-RSR36-230VOwith ductless indoor unit OS-R36SRW-230VIOLMO3 tons · 34,600 Btu/h · DuctlessNot a cold-climate pick: keeps 57% of its heat at 5°FMeets none of the standards tracked here
    Heat kept at 5°F
    58% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    1.95 (COP at 5°F)
    Below the middle
    Winter efficiency
    8.4 (HSPF2)
    Below the middle
    Cooling efficiency
    20.0 (SEER2)
    Below the middle
    Hot-day cooling
    9.5 (EER2)
    Below the middle
    16.2score / 100Heating 12 · Cooling 20

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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