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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 67% and a typical MSH LEGACY model 51%. 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

MSH LEGACY

51%

of similar heat pumps beaten by its typical model

About average

18 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%MSH LEGACY: Beats 78%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FMAXI AIR: Beats 70%MSH LEGACY: Beats 16%
  • Winter-long heating efficiencyHSPF2MAXI AIR: Beats 75%MSH LEGACY: Beats 33%
  • Summer-long cooling efficiencySEER2MAXI AIR: Beats 76%MSH LEGACY: Beats 29%
  • Hot-day cooling efficiencyEER2MAXI AIR: Beats 63%MSH LEGACY: Beats 91%

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%
    MSH LEGACY
    0%

  • Xcel CC

    MAXI AIR
    74%
    MSH LEGACY
    0%

  • CEE Advanced

    MAXI AIR
    0%
    MSH LEGACY
    0%

  • ENERGY STAR CC

    MAXI AIR
    53%
    MSH LEGACY
    0%

Top cold-climate picks, ductless 3.5–4.5 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, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?

MAXI AIR

No ductless, 3.5–4.5 tons model from MAXI AIR.

MSH LEGACY

No ductless, 3.5–4.5 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.

Open the advanced view