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MAXI AIR vs SLOMIN'S: heat pump ratings compared

Against heat pumps of the same size and type, a typical MAXI AIR model beats 75% and a typical SLOMIN'S model 36%. 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

SLOMIN'S

36%

of similar heat pumps beaten by its typical model

Well below average

10 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%SLOMIN'S: Beats 39%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FMAXI AIR: Beats 83%SLOMIN'S: Beats 43%
  • Winter-long heating efficiencyHSPF2MAXI AIR: Beats 83%SLOMIN'S: Beats 37%
  • Summer-long cooling efficiencySEER2MAXI AIR: Beats 77%SLOMIN'S: Beats 45%
  • Hot-day cooling efficiencyEER2MAXI AIR: Beats 77%SLOMIN'S: Beats 17%

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%
    SLOMIN'S
    80%

  • Xcel CC

    MAXI AIR
    100%
    SLOMIN'S
    60%

  • CEE Advanced

    MAXI AIR
    0%
    SLOMIN'S
    0%

  • ENERGY STAR CC

    MAXI AIR
    70%
    SLOMIN'S
    0%

Top cold-climate picks, ductless 2.5–3 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, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?

MAXI AIR

  1. 1T55-MULTI36E454MAXI AIRAlso listed as T55-MULTI36E4543 tons · 36,000 Btu/h · DuctlessKeeps 103% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    103% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    10.6 (HSPF2)
    Great
    78.0score / 100
  2. 2T55-MULTI28E454MAXI AIRAlso listed as T55-MULTI28E4542.5 tons · 27,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel 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
    Seasonal efficiency
    10.5 (HSPF2)
    Great
    72.9score / 100

SLOMIN'S

  1. 1AC116727CZSLOMIN'S2.5 tons · 28,000 Btu/h · DuctlessKeeps 71% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Good
    Seasonal efficiency
    8.5 (HSPF2)
    Below the middle
    34.7score / 100
  2. 2AC116735CZSLOMIN'S3 tons · 35,000 Btu/h · DuctlessKeeps 70% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel 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
    Seasonal efficiency
    8.5 (HSPF2)
    Below the middle
    31.6score / 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.

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