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AUX heat pump efficiency: 149 outdoor models compared

AUX has 149 heat pump outdoor models certified with this refrigerant group, in 183 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes AUX makes. Ranks are among manufacturers with a QMID on file and at least 10 scored models.

New to heat pump ratings? The Simple view explains them in plain words →

ManufacturerData as of updated · sources

Outdoor models
149
AHRI certifications
183
Efficiency index
52%
Typical model vs same-size, same-type peers (139 models)
Meet CEE 2025
67.8%
101 models

How AUX compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.
AUX against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of AUX’s own modelsAUX is strongest on COP at 5°F (its typical model beats 62% of comparable models) and weakest on EER2 (40%).
  • AUX
  • Middle half of its models
  • Other ranked manufacturers
AUX

Source: AHRI Directory, NEEP · as of

Average peer percentile of AUX’s models
RatingBeats comparable modelsRankRaw median
Efficiency index139 models scored52%18th of 29—
COP at 5°F161 models scored62%7th of 292.05
Capacity retention at 5°F139 models scored51%15th of 2976%
HSPF2161 models scored43%22nd of 299.0
SEER2161 models scored51%16th of 2920.5
EER2161 models scored40%26th of 2911.3
Heating capacity at 5°F143 models scored49%19th of 2911,600 Btu/h

Standards met

Share of AUX’s models with at least one qualifying certification
StandardShareModels
CEE 2025 Tier 1 (Split ASHP)67.8%101
CEE 2026 Tier 1 (Split ASHP)66.4%99
CEE Advanced Tier (Split ASHP)1.3%2
Xcel Energy Colorado cold-climate ASHP (2025)63.1%94
DOE Cold Climate Heat Pump Challenge1.3%2
ENERGY STAR Cold Climate44.3%66

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.
AUX’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line
  • AUX (median, middle 50%, 10th–90th)
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 modelsNon-ducted, 3.5–4.5 tons2.00564 modelsmedian

Source: AHRI Directory · as of

Share of comparable models beaten, per peer group
Size and duct typeModelsIndexCOP@5°FHSPF2SEER2
Ducted, up to 1.5 tons659%49%42%71%
Ducted, 2 tons459%37%68%76%
Ducted, 2.5–3 tons963%49%74%83%
Ducted, 3.5–4.5 tons561%60%79%67%
Non-ducted, up to 1.5 tons9047%66%36%45%
Non-ducted, 2 tons2756%60%47%52%
Non-ducted, 2.5–3 tons1851%66%38%44%
Non-ducted, 3.5–4.5 tons273%52%64%93%

Every AUX model in the market

AUX’s 161 models with a known size and duct type, over the shape of the whole catalog.
AUX models by size and ratingColoured: AUX · grey shapes: all 14,508 models · lines: catalog medians by size
  • AUX models
  • Ducted median by size
  • Non-ducted median by size
  • Every model at each size (width = count)
  • Standard threshold

Dots: 161 aux models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 14,508 models, half a ton at a time.
Show the data as a table
COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, sizeModels10th pct.25thMedian75th90th
Ducted, 0.5 tons8261.641.711.751.852.24
Ducted, 1 ton4071.801.902.052.412.45
Ducted, 1.5 tons9921.751.862.002.172.40
Ducted, 2 tons9991.751.862.002.182.30
Ducted, 2.5 tons1,0401.701.802.002.102.36
Ducted, 3 tons6961.801.902.002.102.42
Ducted, 3.5 tons8641.701.802.002.102.46
Ducted, 4 tons7271.801.862.002.122.40
Ducted, 4.5 tons6901.701.801.902.102.20
Ducted, 5 tons861.892.002.102.102.10
Non-ducted, 0.5 tons1,1861.751.801.902.002.22
Non-ducted, 1 ton1,3431.801.801.992.102.21
Non-ducted, 1.5 tons1,2611.801.802.002.102.31
Non-ducted, 2 tons7611.801.982.002.102.30
Non-ducted, 2.5 tons4031.801.852.002.002.10
Non-ducted, 3 tons4731.901.982.002.032.20
Non-ducted, 3.5 tons2802.002.002.002.052.10
Non-ducted, 4 tons2041.962.002.052.102.11
Non-ducted, 4.5 tons781.901.911.952.012.01
Non-ducted, 5 tons841.992.002.052.202.20

Source: AHRI Directory · as of

Top AUX models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 5 AUX cold-climate picks across sizes. 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.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2Btu/h @5°FSEER2MeetsCombosAHRI ref.Compared withScore
1AM3-H24/2DR3BAUX · C-SeriesAlso listed as ASUM24HPMULO2 tons24,000 Btu/h · Non-ducted108%2.1010.526,00024.0CEE 25CEE 26CEE AdvXcelDOEES CC1214097943Non-ducted, 2 tons84.4
2AM2-H18/2DR3BAUX · C-SeriesAlso listed as ASUM18HPMULO1.5 tons18,000 Btu/h · Non-ducted121%2.0011.021,80023.3CEE 25CEE 26XcelES CC1214097940Non-ducted, up to 1.5 tons82.7
3ASW-H18E3B2/*R3DI-D2AUX · M-Serieswith ductless indoor unit ASW-H18E3B2/*R3DI-D2Also listed as ASW-H18E3B2/**R3DI-D21.5 tons18,000 Btu/h · Non-ducted82%2.2510.515,00025.0CEE 25CEE 26XcelES CC1215218928Non-ducted, up to 1.5 tons79.2
4ASW-H24F6A2/ *R3DI-D7AUX · C-Serieswith ductless indoor unit ASW-H24F6A2/ *R3DI-D7Also listed as ASW-H24F6A2/**R3DI-D72 tons22,400 Btu/h · Non-ducted85%2.1010.520,40025.0CEE 25CEE 26XcelES CC1217115274Non-ducted, 2 tons77.4
5AFEB24HP230V1COAUX · C-Serieswith ductless indoor unit AFEB24HP230V1CHAlso listed as ASW-H24F8A2/*R3DI-C7, ASW-H24F8A2/**R3DI-C72 tons23,000 Btu/h · Non-ducted87%2.2010.020,80022.0CEE 25CEE 26XcelES CC1214290023Non-ducted, 2 tons77.2

All-around best

Top 5 AUX models on the all-around score across sizes. 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.
# · Outdoor modelSize · typeCap. 5/47COP@5°FHSPF2SEER2EER2MeetsCombosAHRI ref.Compared withScoreHeating halfCooling halfCold-climate score
1ASUM42HPMULOAUX · C-Series3.5 tons42,000 Btu/h · Ducted83%2.1010.022.012.3CEE 25CEE 26XcelES CC3216032440Ducted, 3.5–4.5 tons87.076.897.376.8
2ASW-H24F6A2/ *R3DI-D7AUX · C-Serieswith ductless indoor unit ASW-H24F6A2/ *R3DI-D7Also listed as ASW-H24F6A2/**R3DI-D72 tons22,400 Btu/h · Non-ducted85%2.1010.525.014.0CEE 25CEE 26XcelES CC1217115274Non-ducted, 2 tons86.577.495.677.4
3AMAR24HP230V1COAUX · C-Serieswith ductless indoor unit AMAR24HP230V1CH2 tons22,400 Btu/h · Non-ducted89%2.0910.525.014.0CEE 25CEE 26XcelES CC1214290024Non-ducted, 2 tons86.477.195.677.1
4AM3-H24/2DR3BAUX · C-SeriesAlso listed as ASUM24HPMULO2 tons24,000 Btu/h · Non-ducted108%2.1010.524.013.0CEE 25CEE 26CEE AdvXcelDOEES CC1214097943Non-ducted, 2 tons85.384.486.184.4
5ASW-H18E3B2/*R3DI-D2AUX · M-Serieswith ductless indoor unit ASW-H18E3B2/*R3DI-D2Also listed as ASW-H18E3B2/**R3DI-D21.5 tons18,000 Btu/h · Non-ducted82%2.2510.525.014.0CEE 25CEE 26XcelES CC1215218928Non-ducted, up to 1.5 tons82.979.286.779.2

Best model on each rating

AUX’s model with the highest peer percentile on each rating, ranked by that one rating only
RatingModelValueCompared withBeatsAHRI ref.
COP at 5°FAFEB09HP115V1CO2.52Non-ducted, up to 1.5 tons100%214290017
Capacity retention at 5°FAM3-H24/2DR3BAlso listed as ASUM24HPMULO108%Non-ducted, 2 tons98%214097943
HSPF2AM4-H36/2DR3BAlso listed as ASUM36HPMULO11.0Non-ducted, 2.5–3 tons96%214097941
SEER2ASUM42HPMULO22.0Ducted, 3.5–4.5 tons100%216032440
EER2AMAR24HP230V1CO14.0Non-ducted, 2 tons96%214290024
Heating capacity at 5°FAM2-H18/2DR3BAlso listed as ASUM18HPMULO21,800 Btu/hNon-ducted, up to 1.5 tons99%214097940

All 149 AUX models in Explore

AUX size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.
AUX: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct typeCold-climate pickCold-climate score, best modelAll-around bestAll-around score, best model
Ducted, up to 1.5 tons74.7(50 is the typical model of its size class)ASUM18HPMULO6 of 6 models qualify · AHRI 21603243779.0(50 is the typical model of its size class)ASUM18HPMULO6 of 6 models have all five ratings · AHRI 216032437
Ducted, 2 tons63.0(50 is the typical model of its size class)ASUM24HPMULO4 of 4 models qualify · AHRI 21603243878.5(50 is the typical model of its size class)ASUM24HPMULO4 of 4 models have all five ratings · AHRI 216032438
Ducted, 2.5–3 tons73.8(50 is the typical model of its size class)ASPR30HPMULO6 of 9 models qualify · AHRI 21603240081.2(50 is the typical model of its size class)ASUM36HPMULO9 of 9 models have all five ratings · AHRI 216032439
Ducted, 3.5–4.5 tons76.8(50 is the typical model of its size class)ASUM42HPMULO5 of 5 models qualify · AHRI 21603244087.0(50 is the typical model of its size class)ASUM42HPMULO5 of 5 models have all five ratings · AHRI 216032440
Non-ducted, up to 1.5 tons82.7(50 is the typical model of its size class)AM2-H18/2DR3BAlso listed as ASUM18HPMULO58 of 90 models qualify · AHRI 21409794082.9(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
Non-ducted, 2 tons84.4(50 is the typical model of its size class)AM3-H24/2DR3BAlso listed as ASUM24HPMULO13 of 27 models qualify · AHRI 21409794386.5(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
Non-ducted, 2.5–3 tons73.2(50 is the typical model of its size class)AM4-H36/2DR3BAlso listed as ASUM36HPMULO14 of 18 models qualify · AHRI 21409794178.3(50 is the typical model of its size class)AM4-H36/2DR3BAlso listed as ASUM36HPMULO14 of 18 models have all five ratings · AHRI 214097941
Non-ducted, 3.5–4.5 tons59.9(50 is the typical model of its size class)ASUM42HPMULO2 of 2 models qualify · AHRI 21605094274.4(50 is the typical model of its size class)ASUM42HPMULO2 of 2 models have all five ratings · AHRI 216050942

All-around board, every manufacturer

Newest AUX certifications

By AHRI reference number; AHRI issues references in increasing order.
The 5 most recently certified AUX outdoor models
Outdoor modelSize · typeCOP@5°FCap. 5/47HSPF2SEER2MeetsCombosAHRI ref.
ASPR27HPMULOAUX · A-Series2.5 tons27,000 Btu/h · Ducted and non-ducted and mixed (multi-zone)2.0056%9.522.0CEE 25CEE 26Xcel3218799887
ASW-H30H8A8/**R3DI-B9AUX · M serieswith ductless indoor unit ASW-H30H8A8/**R3DI-B92.5 tons30,000 Btu/h · Non-ducted1.8573%9.020.0CEE 25CEE 26Xcel1218746698
ASW-H12C5C3/P*R3DI-C5AUX · P serieswith ductless indoor unit ASW-H12C5C3/P*R3DI-C51 ton12,000 Btu/h · Non-ducted1.8575%9.522.0CEE 25CEE 26XcelES CC1218743571
ASW-H12C5C2/P*R3DI-C5AUX · P serieswith ductless indoor unit ASW-H12C5C2/P*R3DI-C51 ton12,000 Btu/h · Non-ducted2.1075%9.522.0CEE 25CEE 26XcelES CC1218743570
AS-H24F8A2/**R3DI-C1AUXwith ductless indoor unit AW-H24F8A2/**R3DI-C12 tons23,000 Btu/h · Non-ducted1.98—8.318.5None1218647765

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AUX includes these brand names as listed in AHRI: AUX. Standards are checked against published thresholds; program rules beyond ratings are not checked.