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.

GE Appliances and ZERO 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, GE Appliances scores higher on 4 of the 6 ratings.

GE Appliances
ZERO
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	GE Appliances	ZERO
Efficiency index	49%median — · 22nd ranked	49%median —
COP at 5°F	42%median 1.89 · 24th ranked	48%median 1.89
Capacity retention at 5°F	45% (higher)median 69% · 21st ranked	43% (higher)median 70%
HSPF2	50% (higher)median 9.0 · 16th ranked	46% (higher)median 8.6
SEER2	46%median 18.0 · 18th ranked	53%median 19.0
EER2	50% (higher)median 11.7 · 15th ranked	46% (higher)median 11.0
Heating capacity at 5°F	47% (higher)median 16,500 Btu/h · 19th ranked	44% (higher)median 11,700 Btu/h
Outdoor models	66	69
AHRI certifications	6,840	89

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	GE Appliances	ZERO
CEE 2025 Tier 1 (Split ASHP)	62.1%41 models	59.4%41 models
CEE 2026 Tier 1 (Split ASHP)	60.6%40 models	55.1%38 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	36.4%24 models	47.8%33 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	27.3%18 models	24.6%17 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

GE Appliances
ZERO
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	GE Appliances	ZERO
Ducted, up to 1.5 tons	9 · index 42%	2 · index 59%
Ducted, 2 tons	10 · index 51%	5 · index 69%
Ducted, 2.5–3 tons	9 · index 53%	7 · index 57%
Ducted, 3.5–4.5 tons	15 · index 54%	9 · index 63%
Ducted, 5 tons and up	None	1 · index 57%
Non-ducted, up to 1.5 tons	24 · index 53%	33 · index 48%
Non-ducted, 2 tons	8 · index 44%	9 · index 49%
Non-ducted, 2.5–3 tons	4 · index 35%	8 · index 39%
Non-ducted, 3.5–4.5 tons	2 · index 18%	3 · index 50%

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	GE AppliancesCold-climate score, best model	ZEROCold-climate score, best model
Ducted, up to 1.5 tons	52.9(50 is the typical model of its size class) (higher)ASH220NCDD**4 of 9 models qualify · AHRI 210154190	52.0(50 is the typical model of its size class)Z3SOV-18HDM-US1 of 2 models qualify · AHRI 214723150
Ducted, 2 tons	67.5(50 is the typical model of its size class)NS22H24MA4-**Awith ducted air handler NAM30V2TA44 of 10 models qualify · AHRI 212396412	80.3(50 is the typical model of its size class) (higher)ZSOV-24HDM-USwith ducted air handler ZDV-24HDM-US2 of 5 models qualify · AHRI 212928560
Ducted, 2.5–3 tons	62.0(50 is the typical model of its size class) (higher)ASH436NCDD**2 of 9 models qualify · AHRI 210154197	57.4(50 is the typical model of its size class)Z3SOV-27HDM-US1 of 7 models qualify · AHRI 213732663
Ducted, 3.5–4.5 tons	78.1(50 is the typical model of its size class) (higher)NS17H48SA4-**Awith indoor coil D(A,C,E)48D44+TDR and furnace NF97D070M3B-3 of 15 models qualify · AHRI 213884874	74.9(50 is the typical model of its size class)Z5SOV-48HDM-US1 of 9 models qualify · AHRI 213732669
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 1 models qualify)
Non-ducted, up to 1.5 tons	79.5(50 is the typical model of its size class)ASH112URDE**with ductless indoor unit ASYW12URDE12 of 24 models qualify · AHRI 212409457	86.0(50 is the typical model of its size class) (higher)ZMSB-09HV-USHHwith ductless indoor unit ZMSB-09HV-USHH24 of 33 models qualify · AHRI 213917748
Non-ducted, 2 tons	61.1(50 is the typical model of its size class)ASH324NCDD**5 of 8 models qualify · AHRI 210154192	74.2(50 is the typical model of its size class) (higher)ZSOV-24HDM-USwith ductless indoor unit ZEV-24HDM-US4 of 9 models qualify · AHRI 212928564
Non-ducted, 2.5–3 tons	67.0(50 is the typical model of its size class) (higher)ASH436NCDD**3 of 4 models qualify · AHRI 210154196	49.3(50 is the typical model of its size class)Z3SOV-27HDM-US1 of 8 models qualify · AHRI 213732662
Non-ducted, 3.5–4.5 tons	19.2(50 is the typical model of its size class)ASH4248UCDD**with ductless indoor unit USYL42UCDD1 of 2 models qualify · AHRI 211744614	80.5(50 is the typical model of its size class) (higher)Z5SOV-48HDM-US2 of 3 models qualify · AHRI 213732668

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	GE AppliancesAll-around score, best model	ZEROAll-around score, best model
Ducted, up to 1.5 tons	61.2(50 is the typical model of its size class) (higher)NS17H18SA4-**Awith indoor coil D(A,C,E)24D34+TDR and furnace NF97D070M3B-7 of 9 models have all five ratings · AHRI 213884332	59.4(50 is the typical model of its size class)Z3SOV-18HDM-US1 of 2 models have all five ratings · AHRI 214723150
Ducted, 2 tons	82.7(50 is the typical model of its size class)NS22H24MA4-**Awith ducted air handler NAM30V2TA49 of 10 models have all five ratings · AHRI 212396412	83.8(50 is the typical model of its size class) (higher)ZSOV-24HDM-USwith ducted air handler ZDV-24HDM-US2 of 5 models have all five ratings · AHRI 212928560
Ducted, 2.5–3 tons	83.2(50 is the typical model of its size class) (higher)NS22H36MA4-**Awith indoor coil D(A,C,E)36D44+TDR and furnace NF97D070M3B-7 of 9 models have all five ratings · AHRI 213884682	71.5(50 is the typical model of its size class)Z3SOV-27HDM-US3 of 7 models have all five ratings · AHRI 213732663
Ducted, 3.5–4.5 tons	78.0(50 is the typical model of its size class)NS17H48SA4-**Awith indoor coil D(A,C,E)48D44+TDR and furnace NF80D110S5C-11 of 14 models have all five ratings · AHRI 213884846	82.0(50 is the typical model of its size class) (higher)Z5SOV-48HDM-US2 of 9 models have all five ratings · AHRI 213732669
Ducted, 5 tons and up	67.6(50 is the typical model of its size class) (higher)NS17H60SA4-Awith indoor coil NCUC60CT5D-+TDR and furnace NF80U110T5C1 of 1 models have all five ratings · AHRI 217490085	57.1(50 is the typical model of its size class)ZSOV-60HDM-USwith ducted air handler ZDV-60HDM-US1 of 1 models have all five ratings · AHRI 212928563
Non-ducted, up to 1.5 tons	88.8(50 is the typical model of its size class) (higher)ASH109URDE**with ductless indoor unit ASYW09URDE22 of 24 models have all five ratings · AHRI 212409456	86.7(50 is the typical model of its size class)ZMSB-09HV-USHHwith ductless indoor unit ZMSB-09HV-USHH33 of 33 models have all five ratings · AHRI 213917748
Non-ducted, 2 tons	59.8(50 is the typical model of its size class)ASH324JCDD**8 of 8 models have all five ratings · AHRI 207698999	72.0(50 is the typical model of its size class) (higher)ZSOV-24HDM-USwith ductless indoor unit ZEV-24HDM-US9 of 9 models have all five ratings · AHRI 212928564
Non-ducted, 2.5–3 tons	48.7(50 is the typical model of its size class)ASH436NCDD**4 of 4 models have all five ratings · AHRI 210154196	66.7(50 is the typical model of its size class) (higher)Z3SOV-27HDM-US8 of 8 models have all five ratings · AHRI 213732662
Non-ducted, 3.5–4.5 tons	18.3(50 is the typical model of its size class)ASH542JCDD**2 of 2 models have all five ratings · AHRI 210532846	73.8(50 is the typical model of its size class) (higher)Z5SOV-48HDM-US3 of 3 models have all five ratings · AHRI 213732668

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	GE Appliances	ZERO
COP at 5°F	beats 99% · 2.99NS17H48SA4-**ADucted, 3.5–4.5 tons	beats 96% · 2.22ZMSB-24HV-USHHNon-ducted, 2 tons
Capacity retention at 5°F	beats 92% · 106%ASH109URDE**Non-ducted, up to 1.5 tons	beats 84% · 87%Z5SOV-48HDM-USDucted, 3.5–4.5 tons
HSPF2	beats 99% · 14.0ASH109URDSE*Non-ducted, up to 1.5 tons	beats 98% · 11.2ZSOV-24HDM-USDucted, 2 tons
SEER2	beats 100% · 30.0ASH109URDSE*Non-ducted, up to 1.5 tons	beats 99% · 20.9Z5SOV-48HDM-USDucted, 3.5–4.5 tons
EER2	beats 100% · 14.5NS17H18SA4-**ADucted, up to 1.5 tons	beats 95% · 15.8ZMSB-09HV-USHHCAlso listed as ZMSB-09HV-USHHC-ONon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 94% · 18,500 Btu/hASH220NCDD**Non-ducted, up to 1.5 tons	beats 90% · 17,200 Btu/hZMSB-18HV-USHHCAlso listed as ZMSB-18HV-USHHC-ONon-ducted, up to 1.5 tons

More comparisons

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GE Appliances vs ZERO heat pumps