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MAXI AIR vs OLMO: heat pump ratings compared

Against heat pumps of the same size and type, a typical MAXI AIR model beats 67% and a typical OLMO model 38%. MAXI AIR rates higher overall.

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

MAXI AIR

67%

of similar heat pumps beaten by its typical model

Well above average

19 models listed

OLMO

38%

of similar heat pumps beaten by its typical model

Well below average

20 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°FMAXI AIR: Beats 41%OLMO: Beats 44%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FMAXI AIR: Beats 70%OLMO: Beats 37%
  • Winter-long heating efficiencyHSPF2MAXI AIR: Beats 75%OLMO: Beats 42%
  • Summer-long cooling efficiencySEER2MAXI AIR: Beats 76%OLMO: Beats 43%
  • Hot-day cooling efficiencyEER2MAXI AIR: Beats 63%OLMO: Beats 27%

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

    MAXI AIR
    68%
    OLMO
    50%

  • Xcel CC

    MAXI AIR
    74%
    OLMO
    40%

  • CEE Advanced

    MAXI AIR
    0%
    OLMO
    0%

  • ENERGY STAR CC

    MAXI AIR
    53%
    OLMO
    40%

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?

MAXI AIR

  1. 1YS21F-18HRDN1with ductless indoor unit YS21F-18HRDN1MAXI AIRAlso listed as NE-T52-PLA18INT1.5 tons · 18,000 Btu/h · DuctlessKeeps 70% of its heat at 5°FMeets 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
    2.38 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.3 (HSPF2)
    Great
    70.6score / 100
  2. 2NE-T52-SUPAE18Ewith ductless indoor unit NE-T52-SUPAE18IMAXI AIRAlso listed as NE-T53-AEG18EXT1.5 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
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    11.3 (HSPF2)
    Top 10%
    67.2score / 100
  3. 3NE-T52-SUPAE12Ewith ductless indoor unit NE-T52-SUPAE12IMAXI AIRAlso listed as NE-T53-AEG12EXT1 ton · 12,000 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
    10.4 (HSPF2)
    Great
    62.4score / 100

OLMO

  1. 1OS-MSR18-230VOOLMO1.5 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
    1.80 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    9.5 (HSPF2)
    Good
    56.0score / 100
  2. 2OS-EL09ALP230VOwith ductless indoor unit OS -EL09ALP230VIOLMO1 ton · 9,000 Btu/h · DuctlessKeeps 71% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.10 (COP at 5°F)
    Great
    Seasonal efficiency
    8.8 (HSPF2)
    Below the middle
    54.3score / 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