Skip to content
Rebate.Blue

LG vs MRCOOL: heat pump ratings compared

Against heat pumps of the same size and type, a typical LG model beats 56% and a typical MRCOOL model 53%. LG rates slightly higher overall.

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

LG

56%

of similar heat pumps beaten by its typical model

Above average

100 models listed

MRCOOL

53%

of similar heat pumps beaten by its typical model

About average

92 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°FLG: Beats 56%MRCOOL: Beats 50%
  • Heating power kept at 5°FCapacity at 5°F vs 47°FLG: Beats 57%MRCOOL: Beats 50%
  • Winter-long heating efficiencyHSPF2LG: Beats 51%MRCOOL: Beats 56%
  • Summer-long cooling efficiencySEER2LG: Beats 49%MRCOOL: Beats 54%
  • Hot-day cooling efficiencyEER2LG: Beats 64%MRCOOL: Beats 49%

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

    LG
    86%
    MRCOOL
    67%

  • Xcel CC

    LG
    78%
    MRCOOL
    58%

  • CEE Advanced

    LG
    11%
    MRCOOL
    0%

  • ENERGY STAR CC

    LG
    64%
    MRCOOL
    57%

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?

LG

  1. 1KUMXA421ALG3.5 tons · 42,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.29 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    11.0 (HSPF2)
    Top 10%
    95.9score / 100
  2. 2KUSXA421Awith ductless indoor unit KNSCB421ALG3.5 tons · 42,000 Btu/h · DuctlessKeeps 91% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    91% (Capacity at 5°F vs 47°F)
    Great
    Efficiency at 5°F
    2.20 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.8 (HSPF2)
    Great
    88.6score / 100
  3. 3KUMXA481ALG4 tons · 48,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
    Heat kept at 5°F
    100% (Capacity at 5°F vs 47°F)
    Top 10%
    Efficiency at 5°F
    2.34 (COP at 5°F)
    Top 10%
    Seasonal efficiency
    10.5 (HSPF2)
    Good
    88.0score / 100

MRCOOL

  1. 1MULTI6-48HP230C-OMRCOOL4 tons · 46,000 Btu/h · DuctlessKeeps 78% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    78% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.05 (COP at 5°F)
    Good
    Seasonal efficiency
    10.5 (HSPF2)
    Good
    56.1score / 100
  2. 2DIY-MULTI6-55HP230D-OMRCOOL4 tons · 47,000 Btu/h · DuctlessKeeps 84% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    84% (Capacity at 5°F vs 47°F)
    Good
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.6 (HSPF2)
    Good
    54.8score / 100
  3. 3DIY-MULTI6-48HP230D-OMRCOOL3.5 tons · 43,000 Btu/h · DuctlessKeeps 78% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
    Heat kept at 5°F
    78% (Capacity at 5°F vs 47°F)
    Below the middle
    Efficiency at 5°F
    2.00 (COP at 5°F)
    Below the middle
    Seasonal efficiency
    10.3 (HSPF2)
    Good
    45.0score / 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.

Open the advanced view