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CIAC vs OLMO: heat pump ratings compared

Against heat pumps of the same size and type, a typical CIAC model beats 38% and a typical OLMO model 43%. OLMO rates higher overall.

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

CIAC

38%

of similar heat pumps beaten by its typical model

Well below average

3 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°FCIAC: Beats 83%OLMO: Beats 45%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FCIAC: Beats 16%OLMO: Beats 40%
  • Winter-long heating efficiencyHSPF2CIAC: Beats 11%OLMO: Beats 33%
  • Summer-long cooling efficiencySEER2CIAC: Beats 22%OLMO: Beats 45%
  • Hot-day cooling efficiencyEER2CIAC: Beats 14%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

    CIAC
    33%
    OLMO
    91%

  • Xcel CC

    CIAC
    0%
    OLMO
    55%

  • CEE Advanced

    CIAC
    0%
    OLMO
    0%

  • ENERGY STAR CC

    CIAC
    0%
    OLMO
    36%

Top cold-climate picks, ductless up to 1.5 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, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

CIAC

None of CIAC’s ductless, up to 1.5 tons models qualifies.

OLMO

  1. 1OS-RMS18-230VOOLMO1.5 tons · 18,000 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
    1.99 (COP at 5°F)
    Good
    Seasonal efficiency
    10.0 (HSPF2)
    Good
    69.5score / 100
  2. 2OS-SR18-230VOwith ductless indoor unit OS-18SRW-230VIOLMO1.5 tons · 18,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets 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%
    Seasonal efficiency
    9.8 (HSPF2)
    Good
    69.0score / 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