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.

ADP and EMI 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, EMI scores higher on 4 of the 6 ratings.

ADP
EMI
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 11, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	ADP	EMI
Efficiency index	49%median —	62%median —
COP at 5°F	35%median 1.86	56%median 2.00
Capacity retention at 5°F	86% (higher)median 96%	63% (higher)median 95%
HSPF2	51%median 8.5	69%median 10.5
SEER2	37%median 15.2	61%median 21.4
EER2	43%median 11.0	60%median 12.5
Heating capacity at 5°F	84% (higher)median 33,000 Btu/h	60% (higher)median 18,000 Btu/h
Outdoor models	15	15
AHRI certifications	259	27

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	ADP	EMI
CEE 2025 Tier 1 (Split ASHP)	26.7%4 models	86.7%13 models
CEE 2026 Tier 1 (Split ASHP)	26.7%4 models	86.7%13 models
CEE Advanced Tier (Split ASHP)	6.7%1 models	6.7%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	86.7%13 models	73.3%11 models
DOE Cold Climate Heat Pump Challenge	6.7%1 models	6.7%1 models
ENERGY STAR Cold Climate	0%0 models	73.3%11 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 · 3 groups where both have models

ADP
EMI
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 11, 2026

Models per peer group · efficiency index within the group
Size and duct type	ADP	EMI
Ducted, up to 1.5 tons	3 · index 45%	1 · index 77%
Ducted, 2 tons	4 · index 44%	None
Ducted, 2.5–3 tons	3 · index 43%	2 · index 81%
Ducted, 3.5–4.5 tons	5 · index 58%	1 · index 84%
Non-ducted, up to 1.5 tons	None	8 · index 60%
Non-ducted, 2 tons	None	2 · index 53%
Non-ducted, 2.5–3 tons	None	4 · index 46%
Non-ducted, 3.5–4.5 tons	None	1 · index 76%

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	ADPCold-climate score, best model	EMICold-climate score, best model
Ducted, up to 1.5 tons	57.1(50 is the typical model of its size class)KUSXA181Awith ducted air handler V36H**P12+TXV+TD2 of 2 models qualify · AHRI 217350899	70.8(50 is the typical model of its size class) (higher)EMXMZ218DA1 of 1 models qualify · AHRI 215444941
Ducted, 2 tons	68.4(50 is the typical model of its size class)KUSXB241Awith ducted air handler FEG3230+TXV5 of 5 models qualify · AHRI 217730117	No models in this size class
Ducted, 2.5–3 tons	54.9(50 is the typical model of its size class)KUSXB361Awith ducted air handler FCG3236+TXV+TD3 of 3 models qualify · AHRI 217730111	82.5(50 is the typical model of its size class) (higher)EMXMZ436DA2 of 2 models qualify · AHRI 215444947
Ducted, 3.5–4.5 tons	66.4(50 is the typical model of its size class)KUSXA482Awith ducted air handler HG48*60+TXV+TD5 of 5 models qualify · AHRI 217198710	82.7(50 is the typical model of its size class) (higher)EMXMZ548DA1 of 1 models qualify · AHRI 215444950
Non-ducted, up to 1.5 tons	No models in this size class	96.7(50 is the typical model of its size class)EMXSZ106DAwith ductless indoor unit EMXWAL06DA6 of 8 models qualify · AHRI 215444935
Non-ducted, 2 tons	No models in this size class	88.4(50 is the typical model of its size class)EMXSZ124DAwith ductless indoor unit EMXWAL24DA2 of 2 models qualify · AHRI 215444939
Non-ducted, 2.5–3 tons	No models in this size class	78.0(50 is the typical model of its size class)EMXMZ436DA2 of 4 models qualify · AHRI 215444948
Non-ducted, 3.5–4.5 tons	No models in this size class	73.4(50 is the typical model of its size class)EMXMZ548DA1 of 1 models qualify · AHRI 215444951

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	ADPAll-around score, best model	EMIAll-around score, best model
Ducted, up to 1.5 tons	44.7(50 is the typical model of its size class)KUSXA181Awith ducted air handler V36H**P12+TXV+TD2 of 2 models have all five ratings · AHRI 217350899	77.4(50 is the typical model of its size class) (higher)EMXMZ218DA1 of 1 models have all five ratings · AHRI 215444941
Ducted, 2 tons	53.2(50 is the typical model of its size class)KUSXB241Awith ducted air handler FEG3230+TXV4 of 4 models have all five ratings · AHRI 217730117	No models in this size class
Ducted, 2.5–3 tons	53.4(50 is the typical model of its size class)KUSXA361Awith ducted air handler V36H175P15*+TXV+TD4 of 4 models have all five ratings · AHRI 217350909	83.6(50 is the typical model of its size class) (higher)EMXMZ436DA2 of 2 models have all five ratings · AHRI 215444947
Ducted, 3.5–4.5 tons	65.1(50 is the typical model of its size class)KUSXA422Awith ducted air handler HG48*60+TXV+TD5 of 5 models have all five ratings · AHRI 217198708	83.9(50 is the typical model of its size class) (higher)EMXMZ548DA1 of 1 models have all five ratings · AHRI 215444950
Non-ducted, up to 1.5 tons	No models in this size class	96.2(50 is the typical model of its size class)EMXSZ106DAwith ductless indoor unit EMXWAL06DA8 of 8 models have all five ratings · AHRI 215444935
Non-ducted, 2 tons	No models in this size class	76.4(50 is the typical model of its size class)EMXSZ124DAwith ductless indoor unit EMXWAL24DA2 of 2 models have all five ratings · AHRI 215444939
Non-ducted, 2.5–3 tons	No models in this size class	78.3(50 is the typical model of its size class)EMXMZ436DA4 of 4 models have all five ratings · AHRI 215444946
Non-ducted, 3.5–4.5 tons	No models in this size class	75.6(50 is the typical model of its size class)EMXMZ548DA1 of 1 models have all five ratings · AHRI 215444949

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	ADP	EMI
COP at 5°F	beats 77% · 2.12KUSXB241ADucted, up to 1.5 tons	beats 97% · 2.40EMXSZ106DANon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 100% · 128%KUSXA301ADucted, 2 tons	beats 94% · 110%EMXSZ106DANon-ducted, up to 1.5 tons
HSPF2	beats 73% · 9.1KUSXA482ADucted, 3.5–4.5 tons	beats 99% · 14.8EMXSZ106DANon-ducted, up to 1.5 tons
SEER2	beats 50% · 16.0KUSXA422ADucted, 3.5–4.5 tons	beats 96% · 20.4EMXMZ548DADucted, 3.5–4.5 tons
EER2	beats 67% · 11.7KUSXA422ADucted, 3.5–4.5 tons	beats 99% · 18.0EMXSZ106DANon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 100% · 24,000 Btu/hKUSXB241ADucted, up to 1.5 tons	beats 97% · 19,000 Btu/hEMXMZ218DANon-ducted, up to 1.5 tons

More comparisons

Pick any two manufacturers

ADP vs EMI heat pumps