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Multi MFG vs SLIMAIR: heat pump ratings compared

Against heat pumps of the same size and type, a typical Multi MFG model beats 61% and a typical SLIMAIR model 60%. Multi MFG rates slightly higher overall.

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

Multi MFG

61%

of similar heat pumps beaten by its typical model

Well above average

51 models listed

SLIMAIR

60%

of similar heat pumps beaten by its typical model

Well above average

48 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°FMulti MFG: Beats 62%SLIMAIR: Beats 60%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FMulti MFG: Beats 62%SLIMAIR: Beats 59%
  • Winter-long heating efficiencyHSPF2Multi MFG: Beats 75%SLIMAIR: Beats 73%
  • Summer-long cooling efficiencySEER2Multi MFG: Beats 60%SLIMAIR: Beats 61%
  • Hot-day cooling efficiencyEER2Multi MFG: Beats 51%SLIMAIR: Beats 53%

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

    Multi MFG
    88%
    SLIMAIR
    90%

  • Xcel CC

    Multi MFG
    80%
    SLIMAIR
    77%

  • CEE Advanced

    Multi MFG
    4%
    SLIMAIR
    2%

  • ENERGY STAR CC

    Multi MFG
    69%
    SLIMAIR
    79%

Top cold-climate picks, ductless 2 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 tons (21,000–26,999 Btu/h cooling). What size is my system?

Multi MFG

  1. 1MSH-24HD-Bwith ductless indoor unit 24CCHP0-C-S-BMulti MFG2 tons · 23,400 Btu/h · DuctlessKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    95% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.23 (COP at 5°F)
    Great
    Seasonal efficiency
    11.6 (HSPF2)
    Top 10%
    89.4score / 100
  2. 224MSZ-M-Bwith ductless indoor unit 24FCHP0-C-M-BMulti MFG2 tons · 24,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.27 (COP at 5°F)
    Great
    Seasonal efficiency
    11.1 (HSPF2)
    Top 10%
    77.9score / 100
  3. 327MPC4-HE-BMulti MFG2 tons · 26,000 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
    9.5 (HSPF2)
    Below the middle
    41.1score / 100

SLIMAIR

  1. 1SHC24AH2AGwith ductless indoor unit SHL24AC2AGSLIMAIR2 tons · 23,400 Btu/h · DuctlessKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    95% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.23 (COP at 5°F)
    Great
    Seasonal efficiency
    11.6 (HSPF2)
    Top 10%
    89.4score / 100
  2. 2SHC24AE2AGwith ductless indoor unit SHS24AC2AGSLIMAIR2 tons · 24,000 Btu/h · DuctlessKeeps 76% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    76% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.27 (COP at 5°F)
    Great
    Seasonal efficiency
    11.1 (HSPF2)
    Top 10%
    77.9score / 100
  3. 3SHC24AC2AGwith ductless indoor unit SHM24AC2AGSLIMAIR2 tons · 24,000 Btu/h · DuctlessKeeps 71% of its heat at 5°FMeets Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    71% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.11 (COP at 5°F)
    Great
    Seasonal efficiency
    9.0 (HSPF2)
    Below the middle
    45.1score / 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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