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 York 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, York scores higher on 5 of the 6 ratings.

AUX
York
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 25, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	AUX	York
Efficiency index	49%median — · 21st ranked	54%median — · 13th ranked
COP at 5°F	60%median 2.00 · 7th ranked	67%median 2.13 · 2nd ranked
Capacity retention at 5°F	51%median 75% · 15th ranked	53%median 70% · 14th ranked
HSPF2	40%median 9.0 · 25th ranked	45%median 8.1 · 20th ranked
SEER2	48% (higher)median 20.0 · 18th ranked	40% (higher)median 15.8 · 25th ranked
EER2	39%median 11.0 · 27th ranked	58%median 11.7 · 11th ranked
Heating capacity at 5°F	49%median 9,600 Btu/h · 17th ranked	54%median 20,000 Btu/h · 14th ranked
Outdoor models	189	238
AHRI certifications	223	106,995

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	AUX	York
CEE 2025 Tier 1 (Split ASHP)	68.3%129 models	54.2%129 models
CEE 2026 Tier 1 (Split ASHP)	66.1%125 models	54.2%129 models
CEE Advanced Tier (Split ASHP)	1.1%2 models	7.6%18 models
Xcel Energy Colorado cold-climate ASHP (2025)	65.6%124 models	41.2%98 models
DOE Cold Climate Heat Pump Challenge	1.1%2 models	7.6%18 models
ENERGY STAR Cold Climate	34.9%66 models	34.9%83 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
York
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 25, 2026

Models per peer group · efficiency index within the group
Size and duct type	AUX	York
Ducted, up to 1.5 tons	6 · index 60%	23 · index 55%
Ducted, 2 tons	4 · index 59%	20 · index 49%
Ducted, 2.5–3 tons	9 · index 63%	59 · index 50%
Ducted, 3.5–4.5 tons	5 · index 61%	70 · index 50%
Ducted, 5 tons and up	None	13 · index 43%
Non-ducted, up to 1.5 tons	120 · index 46%	49 · index 61%
Non-ducted, 2 tons	33 · index 52%	17 · index 63%
Non-ducted, 2.5–3 tons	22 · index 46%	16 · index 52%
Non-ducted, 3.5–4.5 tons	2 · index 73%	6 · index 56%

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	YorkCold-climate score, best model
Ducted, up to 1.5 tons	75.4(50 is the typical model of its size class)ASUM18HPMULO6 of 6 models qualify · AHRI 216032437	81.0(50 is the typical model of its size class) (higher)YPAS18BLFASDQ1with ducted air handler YPPIMB18UFA1DQ10 of 21 models qualify · AHRI 218694255
Ducted, 2 tons	62.9(50 is the typical model of its size class)ASUM24HPMULO4 of 4 models qualify · AHRI 216032438	90.1(50 is the typical model of its size class) (higher)HH824E2S11with ducted air handler D(A,C,E)36A4K+JMC12B2SN1+TDR12 of 22 models qualify · AHRI 218026253
Ducted, 2.5–3 tons	73.8(50 is the typical model of its size class)ASPR30HPMULO6 of 9 models qualify · AHRI 216032400	92.2(50 is the typical model of its size class) (higher)HH836E2S11with indoor coil D(A,C,E)36A4K+TDR and furnace Z9ET080C16SMPS122 of 61 models qualify · AHRI 218350129
Ducted, 3.5–4.5 tons	77.1(50 is the typical model of its size class)ASUM42HPMULO5 of 5 models qualify · AHRI 216032440	90.2(50 is the typical model of its size class) (higher)HH860E2S11with ducted air handler DM59A4K+JMC20D2SN1+TDR19 of 68 models qualify · AHRI 218026269
Ducted, 5 tons and up	No models in this size class	64.3(50 is the typical model of its size class)PH9E60N00D212 of 13 models qualify · AHRI 218450295
Non-ducted, up to 1.5 tons	83.5(50 is the typical model of its size class)AM2-H18/2DR3BAlso listed as ASUM18HPMULO80 of 120 models qualify · AHRI 214097940	92.3(50 is the typical model of its size class) (higher)YPAS18BLFASDQ1with ductless indoor unit YPCIB18UFA1DQ42 of 49 models qualify · AHRI 218694256
Non-ducted, 2 tons	84.6(50 is the typical model of its size class)AM3-H24/2DR3BAlso listed as ASUM24HPMULO16 of 33 models qualify · AHRI 214097943	96.8(50 is the typical model of its size class) (higher)YPAS24BLFASDQ1with ductless indoor unit YPCIB24UFA1DQ14 of 17 models qualify · AHRI 218694257
Non-ducted, 2.5–3 tons	73.4(50 is the typical model of its size class)AM4-H36/2DR3BAlso listed as ASUM36HPMULO18 of 22 models qualify · AHRI 214097941	97.3(50 is the typical model of its size class) (higher)YPAS30BLFASDQ1with ductless indoor unit YPCIB30UFA1DQ12 of 16 models qualify · AHRI 218694248
Non-ducted, 3.5–4.5 tons	60.1(50 is the typical model of its size class) (higher)ASUM42HPMULO2 of 2 models qualify · AHRI 216050942	59.4(50 is the typical model of its size class)YPAS48BUFASDQ1with ductless indoor unit YPPFCB48UFA1DQ4 of 6 models qualify · AHRI 218696687

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	YorkAll-around score, best model
Ducted, up to 1.5 tons	79.8(50 is the typical model of its size class)ASUM18HPMULO6 of 6 models have all five ratings · AHRI 216032437	80.8(50 is the typical model of its size class) (higher)YPAS12BLFASDQ1with ducted air handler YPPIMB12UFA1DQ22 of 22 models have all five ratings · AHRI 218694251
Ducted, 2 tons	78.2(50 is the typical model of its size class) (higher)ASUM24HPMULO4 of 4 models have all five ratings · AHRI 216032438	77.4(50 is the typical model of its size class)HH824E2S11with ducted air handler D(A,C,E)36A4K+JME08B2SN1+TDR25 of 25 models have all five ratings · AHRI 218026254
Ducted, 2.5–3 tons	81.4(50 is the typical model of its size class)ASUM36HPMULO9 of 9 models have all five ratings · AHRI 216032439	91.3(50 is the typical model of its size class) (higher)YPAS30BUFASDQ1with ducted air handler YPPIMB30UFA1DQ39 of 55 models have all five ratings · AHRI 218694240
Ducted, 3.5–4.5 tons	87.2(50 is the typical model of its size class) (higher)ASUM42HPMULO5 of 5 models have all five ratings · AHRI 216032440	86.0(50 is the typical model of its size class)HH860E2S11with ducted air handler D(A,C,E)60B3K+JMC20D2SN1+TDR45 of 69 models have all five ratings · AHRI 218014963
Ducted, 5 tons and up	No models in this size class	70.5(50 is the typical model of its size class)PH9E60N00D216 of 14 models have all five ratings · AHRI 218450295
Non-ducted, up to 1.5 tons	84.2(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-D2102 of 120 models have all five ratings · AHRI 215218928	90.0(50 is the typical model of its size class) (higher)YRACXJ12WHAAwith ductless indoor unit YRAKXJ12PHAA49 of 49 models have all five ratings · AHRI 218037193
Non-ducted, 2 tons	87.0(50 is the typical model of its size class) (higher)ASW-H24F6A2/ R3DI-D7with ductless indoor unit ASW-H24F6A2/ R3DI-D7Also listed as ASW-H24F6A2/**R3DI-D729 of 33 models have all five ratings · AHRI 217115274	85.5(50 is the typical model of its size class)YPAS24BLFASDQ1with ductless indoor unit YPCIB24UFA1DQ17 of 17 models have all five ratings · AHRI 218694257
Non-ducted, 2.5–3 tons	78.5(50 is the typical model of its size class)AM4-H36/2DR3BAlso listed as ASUM36HPMULO18 of 22 models have all five ratings · AHRI 214097941	85.2(50 is the typical model of its size class) (higher)YPAS30BUFASDQ1with ductless indoor unit YPCIB30UFA1DQ16 of 16 models have all five ratings · AHRI 218694244
Non-ducted, 3.5–4.5 tons	74.4(50 is the typical model of its size class) (higher)ASUM42HPMULO2 of 2 models have all five ratings · AHRI 216050942	67.9(50 is the typical model of its size class)YRAMX42N5HBA6 of 6 models have all five ratings · AHRI 218080472

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	York
COP at 5°F	beats 100% · 2.52AFEB09HP115V1CONon-ducted, up to 1.5 tons	beats 100% · 3.55UPC24CN23STG1Ducted, 2 tons
Capacity retention at 5°F	beats 99% · 108%AM3-H24/2DR3BAlso listed as ASUM24HPMULONon-ducted, 2 tons	beats 100% · 147%YRACXJ09WHAANon-ducted, up to 1.5 tons
HSPF2	beats 96% · 11.0AM4-H36/2DR3BAlso listed as ASUM36HPMULONon-ducted, 2.5–3 tons	beats 100% · 12.0YPAS30BUFASDQ1Non-ducted, 2.5–3 tons
SEER2	beats 100% · 22.0ASUM42HPMULODucted, 3.5–4.5 tons	beats 100% · 22.0YH960E2C11Also sold as Coleman XH960E2C11Ducted, 3.5–4.5 tons
EER2	beats 97% · 14.0AMAR24HP230V1CONon-ducted, 2 tons	beats 98% · 16.5YPAS12BLFASDQ1Non-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% · 23,000 Btu/hYRACXJ18WHAAAlso listed as YRACXJ18WHBANon-ducted, up to 1.5 tons

In the cold

NEEP cold-climate listings of both manufacturers against all listed models.

AUX vs York: capacity and COP from 47°F downNEEP cold-climate listings at maximum capacity · 6,130 models (45.8% of the catalog) have ratings at 47, 17 and 5°F

All listed models (median, middle 50% and 80%)
AUX (median, middle 50%)
York (median, middle 50%)

One curve per model: its NEEP-rated certification with the best 5°F COP. Every point of a curve is over the same models. NEEP lists only models submitted to it, so this is a cold-climate-leaning subset, not the whole catalog.

Show the data as a table

All listed models: capacity, % of its 47°F maximum
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
All rated models, 47°F	6,130	100%	100%	100%	100%	100%
All rated models, 17°F	6,130	64%	69%	74%	83%	91%
All rated models, 5°F	6,130	57%	61%	69%	77%	83%

All listed models: COP at maximum capacity
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
All rated models, 47°F	6,130	2.8	3.01	3.24	3.48	3.66
All rated models, 17°F	6,130	2	2.14	2.3	2.42	2.61
All rated models, 5°F	6,130	1.8	1.87	2	2.1	2.24

AUX: capacity, % of its 47°F maximum
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
AUX, 47°F	65	100%	100%	100%	100%	100%
AUX, 17°F	65	67%	70%	73%	79%	85%
AUX, 5°F	65	62%	65%	70%	73%	83%

AUX: COP at maximum capacity
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
AUX, 47°F	65	2.93	3.18	3.3	3.52	3.72
AUX, 17°F	65	2.1	2.17	2.28	2.34	2.45
AUX, 5°F	65	1.89	2	2	2.1	2.18

York: capacity, % of its 47°F maximum
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
York, 47°F	50	100%	100%	100%	100%	100%
York, 17°F	50	66%	73%	79%	88%	97%
York, 5°F	50	58%	62%	72%	80%	84%

York: COP at maximum capacity
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
York, 47°F	50	2.7	2.96	3.23	3.4	3.62
York, 17°F	50	2.15	2.2	2.3	2.4	2.51
York, 5°F	50	1.8	1.88	2	2.1	2.2

Source: NEEP ccASHP list · as of Oct 25, 2026

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AUX vs York heat pumps