AUX vs Mitsubishi Electric: heat pump ratings compared
Against heat pumps of the same size and type, a typical AUX model beats 52% and a typical Mitsubishi Electric model 60%. Mitsubishi Electric rates higher overall.
Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated
AUX
52%
of similar heat pumps beaten by its typical model
About average149 models listed
Mitsubishi Electric
60%
of similar heat pumps beaten by its typical model
Well above average156 models listed
- Efficiency on a 5°F dayCOP at 5°FAUX: Beats 62%Mitsubishi Electric: Beats 55%
- Heating power kept at 5°FCapacity at 5°F vs 47°FAUX: Beats 51%Mitsubishi Electric: Beats 54%
- Winter-long heating efficiencyHSPF2AUX: Beats 43%Mitsubishi Electric: Beats 66%
- Summer-long cooling efficiencySEER2AUX: Beats 51%Mitsubishi Electric: Beats 63%
- Hot-day cooling efficiencyEER2AUX: Beats 40%Mitsubishi Electric: Beats 60%
Average (50%)Dashed outline: the other brand, for comparison
Want ranks, distributions per size class and cold-weather curves? Switch to Advanced
Rebate standards
CEE 2025
- AUX
- 68%
- Mitsubishi Electric
- 81%
Xcel CC
- AUX
- 63%
- Mitsubishi Electric
- 67%
CEE Advanced
- AUX
- 1%
- Mitsubishi Electric
- 10%
ENERGY STAR CC
- AUX
- 44%
- Mitsubishi Electric
- 66%
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?
AUX
- 1ASUM42HPMULOAUX3.5 tons · 42,000 Btu/h · DuctlessCold-climate pick, score 59.9Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 82% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.05 (COP at 5°F)
- Good
- Winter efficiency
- 10.3 (HSPF2)
- Good
- Cooling efficiency
- 23.0 (SEER2)
- Great
- Hot-day cooling
- 12.4 (EER2)
- Great
- 2AM5-H42/2DR3BAUX3.5 tons · 42,000 Btu/h · DuctlessCold-climate pick, score 50.3Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 81% (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
- 10.5 (HSPF2)
- Good
- Cooling efficiency
- 24.0 (SEER2)
- Top 10%
- Hot-day cooling
- 12.5 (EER2)
- Top 10%
Mitsubishi Electric
- 1MXZ-SM48NLHZ***Mitsubishi ElectricAlso listed as PUMY-HL48NKMU, MXZ-SM48NLHZ-4 tons · 48,000 Btu/h · DuctlessCold-climate pick, score 78.4Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Below the middle
- Winter efficiency
- 11.5 (HSPF2)
- Top 10%
- Cooling efficiency
- 23.0 (SEER2)
- Great
- Hot-day cooling
- 13.1 (EER2)
- Top 10%
- 2MXZ-SM42NLHZ***Mitsubishi ElectricAlso listed as PUMY-HL42NKMU, MXZ-SM42NLHZ-3.5 tons · 42,000 Btu/h · DuctlessCold-climate pick, score 77.6Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Below the middle
- Winter efficiency
- 11.1 (HSPF2)
- Top 10%
- Cooling efficiency
- 21.5 (SEER2)
- Good
- Hot-day cooling
- 13.4 (EER2)
- Top 10%
- 3MXZ-SM48NL***Mitsubishi ElectricAlso listed as PUMY-L48NKMU, MXZ-SM48NL-4 tons · 48,000 Btu/h · DuctlessCold-climate pick, score 52.5Meets CEE 2025, CEE 2026, 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
- 2.10 (COP at 5°F)
- Great
- Winter efficiency
- 10.4 (HSPF2)
- Good
- Cooling efficiency
- 23.0 (SEER2)
- Great
- Hot-day cooling
- 12.0 (EER2)
- Good
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