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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%

All-around best, ductless 3.5–4.5 tons

Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating 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.

SLOMIN'S

  1. 1AC116742CZSLOMIN'S4 tons · 45,000 Btu/h · DuctlessNot a cold-climate pick: keeps 66% of its heat at 5°FMeets CEE 2025, CEE 2026
    Heat kept at 5°F
    67% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Winter efficiency
    8.5 (HSPF2)
    Below the middle
    Cooling efficiency
    19.0 (SEER2)
    Below the middle
    Hot-day cooling
    10.0 (EER2)
    Below the middle
    17.9score / 100Heating 17 · Cooling 19

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