Against comparable models

Each cell is the share of same-size, same-type models that the manufacturer’s typical model beats (50% is typical); the higher score is in bold. Raw medians are underneath for context: they depend on which sizes each one makes, so they are not compared.

AUX and Mitsubishi Electric on every ratingPeer scores, 0–100 · grey ticks: every ranked manufacturer · shaded: the middle half of each one’s modelsMeasured against models of the same size and duct type, Mitsubishi Electric scores higher on 5 of the 6 ratings.

AUX
Mitsubishi Electric
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 9, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	AUX	Mitsubishi Electric
Efficiency index	52%median — · 18th ranked	60%median — · 6th ranked
COP at 5°F	62% (higher)median 2.05 · 7th ranked	55% (higher)median 2.00 · 18th ranked
Capacity retention at 5°F	51%median 76% · 15th ranked	54%median 71% · 13th ranked
HSPF2	43%median 9.0 · 22nd ranked	66%median 10.0 · 6th ranked
SEER2	51%median 20.5 · 16th ranked	63%median 20.0 · 4th ranked
EER2	40%median 11.3 · 26th ranked	60%median 12.5 · 7th ranked
Heating capacity at 5°F	49%median 11,600 Btu/h · 19th ranked	63%median 20,500 Btu/h · 6th ranked
Outdoor models	149	156
AHRI certifications	183	523

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	AUX	Mitsubishi Electric
CEE 2025 Tier 1 (Split ASHP)	67.8%101 models	80.8%126 models
CEE 2026 Tier 1 (Split ASHP)	66.4%99 models	80.8%126 models
CEE Advanced Tier (Split ASHP)	1.3%2 models	9.6%15 models
Xcel Energy Colorado cold-climate ASHP (2025)	63.1%94 models	66.7%104 models
DOE Cold Climate Heat Pump Challenge	1.3%2 models	9.6%15 models
ENERGY STAR Cold Climate	44.3%66 models	66%103 models

Sizes and duct types offered

Models in each peer group, with the efficiency index of those models against the rest of the group.

Side by side, inside each size and duct typeShape: every model of the group · bars: each manufacturer’s middle half, median dot, 10th–90th line · 8 groups where both have models

AUX
Mitsubishi Electric
All models of the group

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of Oct 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	AUX	Mitsubishi Electric
Ducted, up to 1.5 tons	6 · index 59%	25 · index 62%
Ducted, 2 tons	4 · index 59%	10 · index 61%
Ducted, 2.5–3 tons	9 · index 63%	29 · index 62%
Ducted, 3.5–4.5 tons	5 · index 61%	29 · index 56%
Ducted, 5 tons and up	None	10 · index 54%
Non-ducted, up to 1.5 tons	90 · index 47%	60 · index 64%
Non-ducted, 2 tons	27 · index 56%	13 · index 61%
Non-ducted, 2.5–3 tons	18 · index 51%	21 · index 60%
Non-ducted, 3.5–4.5 tons	2 · index 73%	18 · index 54%
Non-ducted, 5 tons and up	None	6 · index 67%

Cold-climate and all-around picks, size class by size class

Each manufacturer’s best model on each board in every size and duct type, side by side; the higher score is in bold. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there), so the two compare fairly even when they make different sizes.

Cold-climate picks

Best cold-climate pick per size and duct type (keeps at least 70% of its heat at 5°F). Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
Size and duct type	AUXCold-climate score, best model	Mitsubishi ElectricCold-climate score, best model
Ducted, up to 1.5 tons	74.7(50 is the typical model of its size class)ASUM18HPMULO6 of 6 models qualify · AHRI 216032437	85.6(50 is the typical model of its size class) (higher)SUZ-AA15NLHZ***with ducted air handler PEAD-AA15NL10 of 24 models qualify · AHRI 215734918
Ducted, 2 tons	63.0(50 is the typical model of its size class)ASUM24HPMULO4 of 4 models qualify · AHRI 216032438	78.7(50 is the typical model of its size class) (higher)PUZ-AK24NLHZ2***with ducted air handler PVA-AA24NL8 of 10 models qualify · AHRI 218697028
Ducted, 2.5–3 tons	73.8(50 is the typical model of its size class)ASPR30HPMULO6 of 9 models qualify · AHRI 216032400	88.7(50 is the typical model of its size class) (higher)PUZ-AK30NLHZ2***with ducted air handler PVA-AA30NL20 of 30 models qualify · AHRI 218697041
Ducted, 3.5–4.5 tons	76.8(50 is the typical model of its size class)ASUM42HPMULO5 of 5 models qualify · AHRI 216032440	80.2(50 is the typical model of its size class) (higher)MXZ-SM48NLHZ-**18 of 29 models qualify · AHRI 217135880
Ducted, 5 tons and up	No models in this size class	78.1(50 is the typical model of its size class)MXZ-SM60NLHZ-**6 of 10 models qualify · AHRI 217643004
Non-ducted, up to 1.5 tons	82.7(50 is the typical model of its size class)AM2-H18/2DR3BAlso listed as ASUM18HPMULO58 of 90 models qualify · AHRI 214097940	97.5(50 is the typical model of its size class) (higher)MUZ-FX06NLHZ***with ductless indoor unit MSZ-FX06NLAlso listed as MUZ-FX06NLHZ243 of 60 models qualify · AHRI 215611124
Non-ducted, 2 tons	84.4(50 is the typical model of its size class)AM3-H24/2DR3BAlso listed as ASUM24HPMULO13 of 27 models qualify · AHRI 214097943	88.4(50 is the typical model of its size class) (higher)PUZ-AK24NLHZ2***with ductless indoor unit PLA-AE24NL10 of 13 models qualify · AHRI 218697024
Non-ducted, 2.5–3 tons	73.2(50 is the typical model of its size class)AM4-H36/2DR3BAlso listed as ASUM36HPMULO14 of 18 models qualify · AHRI 214097941	93.8(50 is the typical model of its size class) (higher)PUZ-AK30NLHZ2***with ductless indoor unit PLA-AE30NL12 of 21 models qualify · AHRI 218697037
Non-ducted, 3.5–4.5 tons	59.9(50 is the typical model of its size class)ASUM42HPMULO2 of 2 models qualify · AHRI 216050942	78.4(50 is the typical model of its size class) (higher)MXZ-SM48NLHZ***Also listed as PUMY-HL48NKMU, MXZ-SM48NLHZ-13 of 18 models qualify · AHRI 215685467
Non-ducted, 5 tons and up	No models in this size class	70.0(50 is the typical model of its size class)MXZ-SM60NLHZ-**Also listed as PUMY-HL60NKMU6 of 6 models qualify · AHRI 217643003

All-around best

Best all-around model per size and duct type. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
Size and duct type	AUXAll-around score, best model	Mitsubishi ElectricAll-around score, best model
Ducted, up to 1.5 tons	79.0(50 is the typical model of its size class) (higher)ASUM18HPMULO6 of 6 models have all five ratings · AHRI 216032437	78.3(50 is the typical model of its size class)SUZ-AA15NLHZ***with ducted air handler PEAD-AA15NL21 of 22 models have all five ratings · AHRI 215734918
Ducted, 2 tons	78.5(50 is the typical model of its size class)ASUM24HPMULO4 of 4 models have all five ratings · AHRI 216032438	85.1(50 is the typical model of its size class) (higher)PUZ-AK24NLHZ2***with ducted air handler PVA-AA24NL12 of 12 models have all five ratings · AHRI 218697028
Ducted, 2.5–3 tons	81.2(50 is the typical model of its size class)ASUM36HPMULO9 of 9 models have all five ratings · AHRI 216032439	93.9(50 is the typical model of its size class) (higher)PUZ-AK30NLHZ2***with ducted air handler PVA-AA30NL30 of 30 models have all five ratings · AHRI 218697041
Ducted, 3.5–4.5 tons	87.0(50 is the typical model of its size class) (higher)ASUM42HPMULO5 of 5 models have all five ratings · AHRI 216032440	70.4(50 is the typical model of its size class)MXZ-SM48NLHZ-**29 of 29 models have all five ratings · AHRI 217135880
Ducted, 5 tons and up	No models in this size class	65.4(50 is the typical model of its size class)MXZ-SM60NLHZ-**10 of 10 models have all five ratings · AHRI 217643004
Non-ducted, up to 1.5 tons	82.9(50 is the typical model of its size class)ASW-H18E3B2/R3DI-D2with ductless indoor unit ASW-H18E3B2/R3DI-D2Also listed as ASW-H18E3B2/**R3DI-D276 of 90 models have all five ratings · AHRI 215218928	98.7(50 is the typical model of its size class) (higher)MUZ-FX06NLHZ***with ductless indoor unit MSZ-FX06NLAlso listed as MUZ-FX06NLHZ256 of 60 models have all five ratings · AHRI 215611124
Non-ducted, 2 tons	86.5(50 is the typical model of its size class)ASW-H24F6A2/ R3DI-D7with ductless indoor unit ASW-H24F6A2/ R3DI-D7Also listed as ASW-H24F6A2/**R3DI-D723 of 27 models have all five ratings · AHRI 217115274	87.9(50 is the typical model of its size class) (higher)PUZ-AK24NLHZ2***with ductless indoor unit PLA-AE24NL12 of 13 models have all five ratings · AHRI 218697024
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class)AM4-H36/2DR3BAlso listed as ASUM36HPMULO14 of 18 models have all five ratings · AHRI 214097941	92.8(50 is the typical model of its size class) (higher)PUZ-AK30NLHZ2***with ductless indoor unit PLA-AE30NL20 of 21 models have all five ratings · AHRI 218697037
Non-ducted, 3.5–4.5 tons	74.4(50 is the typical model of its size class)ASUM42HPMULO2 of 2 models have all five ratings · AHRI 216050942	85.9(50 is the typical model of its size class) (higher)MXZ-SM48NLHZ***Also listed as PUMY-HL48NKMU, MXZ-SM48NLHZ-18 of 18 models have all five ratings · AHRI 215685467
Non-ducted, 5 tons and up	No models in this size class	68.7(50 is the typical model of its size class)MXZ-SM60NLHZ-**Also listed as PUMY-HL60NKMU6 of 6 models have all five ratings · AHRI 217643003

All-around board, every manufacturer

Standout model on each rating

Each manufacturer’s model that beats the largest share of comparable models on the rating; the higher share is in bold.

Top model per rating by peer percentile, with its AHRI-certified value and peer group
Rating	AUX	Mitsubishi Electric
COP at 5°F	beats 100% · 2.52AFEB09HP115V1CONon-ducted, up to 1.5 tons	beats 100% · 2.70PUZ-AK42NL***Non-ducted, 3.5–4.5 tons
Capacity retention at 5°F	beats 98% · 108%AM3-H24/2DR3BAlso listed as ASUM24HPMULONon-ducted, 2 tons	beats 99% · 140%MUZ-FX06NLHZ***Also listed as MUZ-FX06NLHZ2Non-ducted, up to 1.5 tons
HSPF2	beats 96% · 11.0AM4-H36/2DR3BAlso listed as ASUM36HPMULONon-ducted, 2.5–3 tons	beats 100% · 12.0MXZ-SM36NLHZ***Also listed as PUMY-HL36NKMU, MXZ-SM36NLHZ-Non-ducted, 2.5–3 tons
SEER2	beats 100% · 22.0ASUM42HPMULODucted, 3.5–4.5 tons	beats 100% · 35.0MUZ-FX06NLHZ***Also listed as MUZ-FX06NLHZ2Non-ducted, up to 1.5 tons
EER2	beats 96% · 14.0AMAR24HP230V1CONon-ducted, 2 tons	beats 100% · 21.5MUZ-FX06NLHZ***Also listed as MUZ-FX06NLHZ2Non-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 99% · 21,800 Btu/hAM2-H18/2DR3BAlso listed as ASUM18HPMULONon-ducted, up to 1.5 tons	beats 100% · 26,600 Btu/hMUZ-FX24NLHZ***Also listed as MUZ-FX24NLHZ2Non-ducted, up to 1.5 tons

More comparisons

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AUX vs Mitsubishi Electric heat pumps