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.

1HVAC and LPS Legacy 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, 1HVAC scores higher on 3 of the 6 ratings.

1HVAC
LPS Legacy
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	1HVAC	LPS Legacy
Efficiency index	61%median —	61%median —
COP at 5°F	57%median 2.00	61%median 2.00
Capacity retention at 5°F	59%median 78%	59%median 78%
HSPF2	71% (higher)median 10.0	69% (higher)median 9.8
SEER2	64% (higher)median 19.8	63% (higher)median 19.5
EER2	55%median 12.0	55%median 12.0
Heating capacity at 5°F	62% (higher)median 21,000 Btu/h	61% (higher)median 20,000 Btu/h
Outdoor models	70	65
AHRI certifications	166	193

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	1HVAC	LPS Legacy
CEE 2025 Tier 1 (Split ASHP)	87.1%61 models	83.1%54 models
CEE 2026 Tier 1 (Split ASHP)	85.7%60 models	80%52 models
CEE Advanced Tier (Split ASHP)	4.3%3 models	4.6%3 models
Xcel Energy Colorado cold-climate ASHP (2025)	74.3%52 models	73.8%48 models
DOE Cold Climate Heat Pump Challenge	4.3%3 models	4.6%3 models
ENERGY STAR Cold Climate	77.1%54 models	73.8%48 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 · 10 groups where both have models

1HVAC
LPS Legacy
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	1HVAC	LPS Legacy
Ducted, up to 1.5 tons	8 · index 75%	11 · index 77%
Ducted, 2 tons	8 · index 65%	6 · index 73%
Ducted, 2.5–3 tons	12 · index 65%	13 · index 65%
Ducted, 3.5–4.5 tons	17 · index 65%	10 · index 66%
Ducted, 5 tons and up	1 · index 63%	2 · index 65%
Non-ducted, up to 1.5 tons	22 · index 59%	25 · index 59%
Non-ducted, 2 tons	6 · index 53%	7 · index 56%
Non-ducted, 2.5–3 tons	9 · index 48%	12 · index 50%
Non-ducted, 3.5–4.5 tons	6 · index 53%	8 · index 44%
Non-ducted, 5 tons and up	1 · index 59%	1 · index 61%

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	1HVACCold-climate score, best model	LPS LegacyCold-climate score, best model
Ducted, up to 1.5 tons	86.7(50 is the typical model of its size class)ACIQ-18-HPDwith ducted air handler ACIQ-18W-WMB7 of 8 models qualify · AHRI 216980821	93.5(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ducted air handler D5FSDAH06XAK10 of 11 models qualify · AHRI 215324834
Ducted, 2 tons	85.7(50 is the typical model of its size class)ACIQ-24ZPL-HP230Cwith ducted air handler ACIQ-24CD-HH-MC8 of 8 models qualify · AHRI 216032281	85.7(50 is the typical model of its size class)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK6 of 6 models qualify · AHRI 215324857
Ducted, 2.5–3 tons	83.2(50 is the typical model of its size class)ACIQ-36ZPL-HP230Cwith ducted air handler ACIQ-36CD-HH-MC11 of 12 models qualify · AHRI 216032282	83.2(50 is the typical model of its size class)D5CMHAH36EAK9 of 13 models qualify · AHRI 215357623
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class) (higher)ACIQ-60-HP32with ducted air handler ACIQ-60-AH3217 of 17 models qualify · AHRI 215387237	82.7(50 is the typical model of its size class)D5CMHAH48FAK10 of 10 models qualify · AHRI 215357626
Ducted, 5 tons and up	None on this board (0 of 1 models qualify)	None on this board (0 of 2 models qualify)
Non-ducted, up to 1.5 tons	96.7(50 is the typical model of its size class)ACIQ-06ZPL-HP230Cwith ductless indoor unit ACIQ-06W-HH-MD14 of 22 models qualify · AHRI 216032267	96.8(50 is the typical model of its size class) (higher)D5CPRAH18AAwith ductless indoor unit D5FPHAH18XAK17 of 25 models qualify · AHRI 215413354
Non-ducted, 2 tons	89.4(50 is the typical model of its size class)ACIQ-24ZPL-HP230Cwith ductless indoor unit ACIQ-24CC-HH-MC4 of 6 models qualify · AHRI 216032275	89.4(50 is the typical model of its size class)D5CSHAH24AAKwith ductless indoor unit D5FSCAH24XAK7 of 7 models qualify · AHRI 215324855
Non-ducted, 2.5–3 tons	89.4(50 is the typical model of its size class)ACIQ-36ZPL-HP230Cwith ductless indoor unit ACIQ-36FM-HH-MD6 of 9 models qualify · AHRI 216032289	89.4(50 is the typical model of its size class)D5CLHAH36AAKwith ductless indoor unit D5FCFAH36XAK8 of 12 models qualify · AHRI 215324890
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class)ACIQ-48Z-HH-M6C6 of 6 models qualify · AHRI 216032306	75.5(50 is the typical model of its size class) (higher)D5CMHAH48FAK7 of 8 models qualify · AHRI 215357627
Non-ducted, 5 tons and up	None on this board (0 of 1 models qualify)	None on this board (0 of 1 models qualify)

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	1HVACAll-around score, best model	LPS LegacyAll-around score, best model
Ducted, up to 1.5 tons	86.5(50 is the typical model of its size class)ACIQ-09ZPL-HP230Cwith ducted air handler ACIQ-09CD-HH-MC8 of 8 models have all five ratings · AHRI 216032278	95.6(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ducted air handler D5FSDAH06XAK11 of 11 models have all five ratings · AHRI 215324834
Ducted, 2 tons	78.4(50 is the typical model of its size class)ACIQ-24ZPL-HP230Cwith ducted air handler ACIQ-24CD-HH-MC8 of 8 models have all five ratings · AHRI 216032281	80.0(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK6 of 6 models have all five ratings · AHRI 215324857
Ducted, 2.5–3 tons	83.6(50 is the typical model of its size class)ACIQ-36Z-HH-M5C12 of 12 models have all five ratings · AHRI 216032302	85.5(50 is the typical model of its size class) (higher)D5CMHAH30EAK13 of 13 models have all five ratings · AHRI 215357620
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class)ES-48Z-M6C17 of 17 models have all five ratings · AHRI 216032320	85.7(50 is the typical model of its size class) (higher)D5CMRAH48FAK10 of 10 models have all five ratings · AHRI 215357647
Ducted, 5 tons and up	62.5(50 is the typical model of its size class)ES-55Z-M6C1 of 1 models have all five ratings · AHRI 216032323	65.9(50 is the typical model of its size class) (higher)D5CLRAH58AAKwith ducted air handler D5FLDAH58XHK2 of 2 models have all five ratings · AHRI 215324904
Non-ducted, up to 1.5 tons	96.2(50 is the typical model of its size class)ACIQ-06ZPL-HP230Cwith ductless indoor unit ACIQ-06W-HH-MD22 of 22 models have all five ratings · AHRI 216032267	96.5(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK25 of 25 models have all five ratings · AHRI 215324832
Non-ducted, 2 tons	76.4(50 is the typical model of its size class)ACIQ-24ZPL-HP230Cwith ductless indoor unit ACIQ-24W-HH-MD6 of 6 models have all five ratings · AHRI 216032271	88.5(50 is the typical model of its size class) (higher)D5CSRAH24AAKwith ductless indoor unit D5FPHAH18XAK7 of 7 models have all five ratings · AHRI 215324879
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class)ACIQ-36Z-HH-M5C9 of 9 models have all five ratings · AHRI 216032301	85.8(50 is the typical model of its size class) (higher)D5CMHAH30EAK12 of 12 models have all five ratings · AHRI 215357619
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class)ACIQ-48Z-HH-M6C6 of 6 models have all five ratings · AHRI 216032304	76.7(50 is the typical model of its size class) (higher)D5CMHAH48FAK8 of 8 models have all five ratings · AHRI 215357625
Non-ducted, 5 tons and up	58.6(50 is the typical model of its size class)ES-55Z-M6C1 of 1 models have all five ratings · AHRI 216032322	61.3(50 is the typical model of its size class) (higher)D5CMRAH55FAK1 of 1 models have all five ratings · AHRI 215357649

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	1HVAC	LPS Legacy
COP at 5°F	beats 98% · 2.44EZ-18ZPL-HP230BNon-ducted, up to 1.5 tons	beats 99% · 2.51D5CSRAH12AAKNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 98% · 126%ACIQ-09ZPL-HP230CNon-ducted, up to 1.5 tons	beats 100% · 150%D5CPRAH06AAKNon-ducted, up to 1.5 tons
HSPF2	beats 99% · 14.8ACIQ-06ZPL-HP230CNon-ducted, up to 1.5 tons	beats 100% · 15.6D5CPRAH06AAKNon-ducted, up to 1.5 tons
SEER2	beats 97% · 25.0ES-27Z-M4CNon-ducted, 2.5–3 tons	beats 99% · 33.1D5CPRAH06AAKNon-ducted, up to 1.5 tons
EER2	beats 99% · 18.0ACIQ-06ZPL-HP230CNon-ducted, up to 1.5 tons	beats 100% · 14.5D5CSHAH06AAKDucted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 19,600 Btu/hACIQ-18-HPDDucted, up to 1.5 tons	beats 99% · 22,600 Btu/hD5CPRAH18AANon-ducted, up to 1.5 tons

More comparisons

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1HVAC vs LPS Legacy heat pumps