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 Trane 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, AUX scores higher on 4 of the 6 ratings.

AUX
Trane
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	AUX	Trane
Efficiency index	49%median — · 21st ranked	50%median — · 19th ranked
COP at 5°F	60%median 2.00 · 7th ranked	69%median 2.24 · 1st ranked
Capacity retention at 5°F	51% (higher)median 75% · 15th ranked	43% (higher)median 65% · 25th ranked
HSPF2	40% (higher)median 9.0 · 25th ranked	35% (higher)median 7.5 · 27th ranked
SEER2	48% (higher)median 20.0 · 18th ranked	40% (higher)median 15.5 · 26th ranked
EER2	39%median 11.0 · 27th ranked	67%median 11.7 · 3rd ranked
Heating capacity at 5°F	49% (higher)median 9,600 Btu/h · 17th ranked	44% (higher)median 21,800 Btu/h · 25th ranked
Outdoor models	189	363
AHRI certifications	223	90,866

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	AUX	Trane
CEE 2025 Tier 1 (Split ASHP)	68.3%129 models	39.1%142 models
CEE 2026 Tier 1 (Split ASHP)	66.1%125 models	36.6%133 models
CEE Advanced Tier (Split ASHP)	1.1%2 models	2.5%9 models
Xcel Energy Colorado cold-climate ASHP (2025)	65.6%124 models	25.6%93 models
DOE Cold Climate Heat Pump Challenge	1.1%2 models	2.5%9 models
ENERGY STAR Cold Climate	34.9%66 models	17.9%65 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
Trane
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	Trane
Ducted, up to 1.5 tons	6 · index 60%	18 · index 48%
Ducted, 2 tons	4 · index 59%	42 · index 44%
Ducted, 2.5–3 tons	9 · index 63%	102 · index 49%
Ducted, 3.5–4.5 tons	5 · index 61%	131 · index 53%
Ducted, 5 tons and up	None	46 · index 50%
Non-ducted, up to 1.5 tons	120 · index 46%	15 · index 55%
Non-ducted, 2 tons	33 · index 52%	4 · index 44%
Non-ducted, 2.5–3 tons	22 · index 46%	7 · index 56%
Non-ducted, 3.5–4.5 tons	2 · index 73%	3 · index 63%
Non-ducted, 5 tons and up	None	2 · index 68%

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	TraneCold-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	92.8(50 is the typical model of its size class) (higher)5TWV0X24A1with indoor coil D(A,C,E)36C3J+TDR and furnace S8V2B060M4PCB5 of 20 models qualify · AHRI 216794262
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)5TCV0X36A1with ducted air handler 5TEMCD04AV31+TDRAlso sold as American Standard 5A5V0X36A115 of 40 models qualify · AHRI 218792275
Ducted, 2.5–3 tons	73.8(50 is the typical model of its size class)ASPR30HPMULO6 of 9 models qualify · AHRI 216032400	84.6(50 is the typical model of its size class) (higher)5TWV8X36A1with indoor coil D(A,C,E)36C3J+TDR and furnace S8V2C080M5PCB24 of 102 models qualify · AHRI 216797087
Ducted, 3.5–4.5 tons	77.1(50 is the typical model of its size class)ASUM42HPMULO5 of 5 models qualify · AHRI 216032440	92.8(50 is the typical model of its size class) (higher)5TWV0X48A1with indoor coil D(A,C,E)60B4J+TDR and furnace S9V2D120U5PSC+LRP39 of 131 models qualify · AHRI 216794596
Ducted, 5 tons and up	No models in this size class	81.8(50 is the typical model of its size class)3TXK2260AF00HAAAlso listed as 3TVHS060SF000AA2 of 46 models qualify · AHRI 218451025
Non-ducted, up to 1.5 tons	83.5(50 is the typical model of its size class) (higher)AM2-H18/2DR3BAlso listed as ASUM18HPMULO80 of 120 models qualify · AHRI 214097940	70.0(50 is the typical model of its size class)M5THM2318A12NA*15 of 15 models qualify · AHRI 218067082
Non-ducted, 2 tons	84.6(50 is the typical model of its size class) (higher)AM3-H24/2DR3BAlso listed as ASUM24HPMULO16 of 33 models qualify · AHRI 214097943	39.3(50 is the typical model of its size class)M5THS2324A11NAAwith ductless indoor unit M5MHWUN24A1N0AAAlso listed as M5THS2324A11NA4 of 4 models qualify · AHRI 215385437
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	74.1(50 is the typical model of its size class) (higher)3TVHS036SF000AAAlso listed as 3TXK2224AF00HAA, 3TXK2236AF00HAA5 of 7 models qualify · AHRI 218451026
Non-ducted, 3.5–4.5 tons	60.1(50 is the typical model of its size class)ASUM42HPMULO2 of 2 models qualify · AHRI 216050942	67.5(50 is the typical model of its size class) (higher)3TVHS048SF000AAAlso listed as 3TXK2248AF00HAA3 of 3 models qualify · AHRI 218451027
Non-ducted, 5 tons and up	No models in this size class	64.2(50 is the typical model of its size class)3TVHS060SF000AAAlso listed as 3TXK2260AF00HAA2 of 2 models qualify · AHRI 218451028

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	TraneAll-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	85.2(50 is the typical model of its size class) (higher)5TWV0X24A1with indoor coil D(A,C,E)36C3J+TDR and furnace *UHMB060CCV3+LRP16 of 16 models have all five ratings · AHRI 216794699
Ducted, 2 tons	78.2(50 is the typical model of its size class)ASUM24HPMULO4 of 4 models have all five ratings · AHRI 216032438	87.2(50 is the typical model of its size class) (higher)5TCV0X36A1with ducted air handler 5TEMCD04AV31+TDRAlso sold as American Standard 5A5V0X36A131 of 31 models have all five ratings · AHRI 218792275
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	88.6(50 is the typical model of its size class) (higher)5TWV0X36A1with indoor coil 5PX*D010AS3 and furnace S8V2D120M5PDBAlso sold as American Standard 5A6V0X36A171 of 107 models have all five ratings · AHRI 216453109
Ducted, 3.5–4.5 tons	87.2(50 is the typical model of its size class)ASUM42HPMULO5 of 5 models have all five ratings · AHRI 216032440	89.1(50 is the typical model of its size class) (higher)5TWV0X48A1with indoor coil D(A,C,E)60B4J+TDR and furnace L8V1C100U5VSB+LRP103 of 139 models have all five ratings · AHRI 216794476
Ducted, 5 tons and up	No models in this size class	74.8(50 is the typical model of its size class)3TXK2260AF00HAAAlso listed as 3TVHS060SF000AA9 of 46 models have all five ratings · AHRI 218451025
Non-ducted, up to 1.5 tons	84.2(50 is the typical model of its size class) (higher)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	73.8(50 is the typical model of its size class)M5THM2318A12NA*15 of 15 models have all five ratings · AHRI 218067082
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	50.9(50 is the typical model of its size class)M5THS2324A11NAAwith ductless indoor unit M5MHWUN24A1N0AAAlso listed as M5THS2324A11NA4 of 4 models have all five ratings · AHRI 215385437
Non-ducted, 2.5–3 tons	78.5(50 is the typical model of its size class) (higher)AM4-H36/2DR3BAlso listed as ASUM36HPMULO18 of 22 models have all five ratings · AHRI 214097941	76.5(50 is the typical model of its size class)3TVHS036SF000AAAlso listed as 3TXK2224AF00HAA, 3TXK2236AF00HAA7 of 7 models have all five ratings · AHRI 218451026
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	73.9(50 is the typical model of its size class)3TVHS048SF000AAAlso listed as 3TXK2248AF00HAA3 of 3 models have all five ratings · AHRI 218451027
Non-ducted, 5 tons and up	No models in this size class	67.9(50 is the typical model of its size class)3TVHS060SF000AAAlso listed as 3TXK2260AF00HAA2 of 2 models have all five ratings · AHRI 218451028

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	Trane
COP at 5°F	beats 100% · 2.52AFEB09HP115V1CONon-ducted, up to 1.5 tons	beats 100% · 3.205TWR4036A1Ducted, 2.5–3 tons
Capacity retention at 5°F	beats 99% · 108%AM3-H24/2DR3BAlso listed as ASUM24HPMULONon-ducted, 2 tons	beats 100% · 136%5A6H7036A1Ducted, 2.5–3 tons
HSPF2	beats 96% · 11.0AM4-H36/2DR3BAlso listed as ASUM36HPMULONon-ducted, 2.5–3 tons	beats 100% · 13.53TXK2224AF00HAAAlso listed as 3TXK2236AF00HAA, 3TVHS036SF000AADucted, 2.5–3 tons
SEER2	beats 100% · 22.0ASUM42HPMULODucted, 3.5–4.5 tons	beats 99% · 21.65TWV0X36A1Also sold as American Standard 5A6V0X36A1Ducted, 2.5–3 tons
EER2	beats 97% · 14.0AMAR24HP230V1CONon-ducted, 2 tons	beats 99% · 14.43TVHS036SF000AAAlso listed as 3TXK2224AF00HAA, 3TXK2236AF00HAANon-ducted, 2.5–3 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% · 27,200 Btu/h5TWV0X24A1Ducted, up to 1.5 tons

In the cold

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

AUX vs Trane: 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%)
Trane (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

Trane: capacity, % of its 47°F maximum
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
Trane, 47°F	52	100%	100%	100%	100%	100%
Trane, 17°F	52	71%	73%	85%	90%	93%
Trane, 5°F	52	57%	64%	70%	73%	76%

Trane: COP at maximum capacity
Scope, temperature	Models	10th pct.	25th	Median	75th	90th
Trane, 47°F	52	2.47	2.92	3.14	3.66	4
Trane, 17°F	52	2.14	2.2	2.4	2.5	2.6
Trane, 5°F	52	1.8	1.96	2.1	2.2	2.22

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

More comparisons

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AUX vs Trane heat pumps