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MAXI AIR vs MSH LEGACY: heat pump ratings compared

Against heat pumps of the same size and type, a typical MAXI AIR model beats 75% and a typical MSH LEGACY model 34%. MAXI AIR rates higher overall.

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

MAXI AIR

75%

of similar heat pumps beaten by its typical model

Well above average

10 models listed

MSH LEGACY

34%

of similar heat pumps beaten by its typical model

Well below average

7 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 51%MSH LEGACY: Beats 25%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FMAXI AIR: Beats 83%MSH LEGACY: Beats 11%
  • Winter-long heating efficiencyHSPF2MAXI AIR: Beats 83%MSH LEGACY: Beats 24%
  • Summer-long cooling efficiencySEER2MAXI AIR: Beats 77%MSH LEGACY: Beats 39%
  • Hot-day cooling efficiencyEER2MAXI AIR: Beats 77%MSH LEGACY: Beats 56%

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
    100%
    MSH LEGACY
    0%

  • Xcel CC

    MAXI AIR
    100%
    MSH LEGACY
    0%

  • CEE Advanced

    MAXI AIR
    0%
    MSH LEGACY
    0%

  • ENERGY STAR CC

    MAXI AIR
    70%
    MSH LEGACY
    0%

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?

MAXI AIR

  1. 1T55-MULTI18E454MAXI AIRAlso listed as T55-MULTI18E4541.5 tons · 19,000 Btu/h · DuctlessCold-climate pick, score 73.1Meets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    95% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Winter efficiency
    10.4 (HSPF2)
    Great
    Cooling efficiency
    25.0 (SEER2)
    Great
    Hot-day cooling
    15.0 (EER2)
    Top 10%
    81.9score / 100Heating 73 · Cooling 91
  2. 2T55-AES12EXT454with ductless indoor unit T55-AES12INT454MAXI AIR1 ton · 12,000 Btu/h · DuctlessCold-climate pick, score 60.0Meets 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
    10.5 (HSPF2)
    Great
    Cooling efficiency
    25.4 (SEER2)
    Top 10%
    Hot-day cooling
    13.4 (EER2)
    Great
    72.9score / 100Heating 60 · Cooling 86
  3. 3T55-AES18EXT454with ductless indoor unit T55-AES18INT454MAXI AIR1.5 tons · 18,000 Btu/h · DuctlessCold-climate pick, score 73.8Meets 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
    1.92 (COP at 5°F)
    Below the middle
    Winter efficiency
    11.0 (HSPF2)
    Great
    Cooling efficiency
    21.4 (SEER2)
    Good
    Hot-day cooling
    12.5 (EER2)
    Good
    64.0score / 100Heating 74 · Cooling 54

MSH LEGACY

No ductless, up to 1.5 tons model from MSH LEGACY.

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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