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.

Kerr and ZOKOP 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, Kerr scores higher on 6 of the 6 ratings.

Kerr
ZOKOP
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 9, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Kerr	ZOKOP
Efficiency index	66% (higher)median —	34% (higher)median —
COP at 5°F	59% (higher)median 2.00	34% (higher)median 1.80
Capacity retention at 5°F	77% (higher)median 95%	33% (higher)median 72%
HSPF2	78% (higher)median 10.0	46% (higher)median 9.5
SEER2	64% (higher)median 19.5	36% (higher)median 20.0
EER2	62% (higher)median 11.9	26% (higher)median 10.5
Heating capacity at 5°F	73% (higher)median 18,500 Btu/h	40% (higher)median 9,500 Btu/h
Outdoor models	38	37
AHRI certifications	113	37

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Kerr	ZOKOP
CEE 2025 Tier 1 (Split ASHP)	78.9%30 models	67.6%25 models
CEE 2026 Tier 1 (Split ASHP)	76.3%29 models	67.6%25 models
CEE Advanced Tier (Split ASHP)	2.6%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	89.5%34 models	56.8%21 models
DOE Cold Climate Heat Pump Challenge	2.6%1 models	0%0 models
ENERGY STAR Cold Climate	89.5%34 models	0%0 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 · 4 groups where both have models

Kerr
ZOKOP
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 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	Kerr	ZOKOP
Ducted, up to 1.5 tons	7 · index 75%	None
Ducted, 2 tons	3 · index 60%	None
Ducted, 2.5–3 tons	7 · index 66%	None
Ducted, 3.5–4.5 tons	5 · index 61%	None
Non-ducted, up to 1.5 tons	18 · index 66%	27 · index 31%
Non-ducted, 2 tons	3 · index 58%	3 · index 35%
Non-ducted, 2.5–3 tons	3 · index 67%	6 · index 52%
Non-ducted, 3.5–4.5 tons	2 · index 67%	1 · index 27%

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	KerrCold-climate score, best model	ZOKOPCold-climate score, best model
Ducted, up to 1.5 tons	82.3(50 is the typical model of its size class)A-KHP18SA-1with ducted air handler B-KHP18DA-17 of 7 models qualify · AHRI 217482433	No models in this size class
Ducted, 2 tons	85.7(50 is the typical model of its size class)A-KHP24SA-1with ducted air handler B-KHP24DA-13 of 3 models qualify · AHRI 217482436	No models in this size class
Ducted, 2.5–3 tons	82.5(50 is the typical model of its size class)A-KHP365A-17 of 7 models qualify · AHRI 216097146	No models in this size class
Ducted, 3.5–4.5 tons	82.7(50 is the typical model of its size class)A-KHP486A-15 of 5 models qualify · AHRI 216097150	No models in this size class
Non-ducted, up to 1.5 tons	96.7(50 is the typical model of its size class) (higher)A-KHP06SA-1with ductless indoor unit B-KHP06SA-112 of 18 models qualify · AHRI 216097110	68.6(50 is the typical model of its size class)TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-O14 of 27 models qualify · AHRI 216020699
Non-ducted, 2 tons	89.4(50 is the typical model of its size class)A-KHP24SA-1with ductless indoor unit B-KHP24CA-13 of 3 models qualify · AHRI 217482434	None on this board (0 of 3 models qualify)
Non-ducted, 2.5–3 tons	78.0(50 is the typical model of its size class) (higher)A-KHP365A-13 of 3 models qualify · AHRI 216097148	57.5(50 is the typical model of its size class)TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-O6 of 6 models qualify · AHRI 216020700
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class) (higher)A-KHP486A-12 of 2 models qualify · AHRI 216097152	24.7(50 is the typical model of its size class)ZP42M2/19-O1 of 1 models qualify · AHRI 218035871

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	KerrAll-around score, best model	ZOKOPAll-around score, best model
Ducted, up to 1.5 tons	86.5(50 is the typical model of its size class)A-KHP09SA-1with ducted air handler B-KHP09DA-17 of 7 models have all five ratings · AHRI 217482423	No models in this size class
Ducted, 2 tons	78.4(50 is the typical model of its size class)A-KHP24SA-1with ducted air handler B-KHP24DA-13 of 3 models have all five ratings · AHRI 217482436	No models in this size class
Ducted, 2.5–3 tons	83.6(50 is the typical model of its size class)A-KHP365A-17 of 7 models have all five ratings · AHRI 216097146	No models in this size class
Ducted, 3.5–4.5 tons	83.9(50 is the typical model of its size class)A-KHP486A-15 of 5 models have all five ratings · AHRI 216097150	No models in this size class
Non-ducted, up to 1.5 tons	96.2(50 is the typical model of its size class) (higher)A-KHP06SA-1with ductless indoor unit B-KHP06SA-116 of 18 models have all five ratings · AHRI 216097110	72.2(50 is the typical model of its size class)TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-O27 of 27 models have all five ratings · AHRI 216020699
Non-ducted, 2 tons	76.4(50 is the typical model of its size class) (higher)A-KHP24SA-1with ductless indoor unit B-KHP24SA-1Also listed as A-ZKP24SA-13 of 3 models have all five ratings · AHRI 216097114	39.1(50 is the typical model of its size class)TSC-24HA2/I2XI18B-Owith ductless indoor unit TSC-24HA2/I2XI18B-IAlso listed as TSC-24HA2/I2XI18B-O3 of 3 models have all five ratings · AHRI 216020695
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class) (higher)A-KHP365A-13 of 3 models have all five ratings · AHRI 216097145	65.1(50 is the typical model of its size class)TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-O6 of 6 models have all five ratings · AHRI 216020700
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class) (higher)A-KHP486A-12 of 2 models have all five ratings · AHRI 216097149	27.2(50 is the typical model of its size class)ZP42M2/19-O1 of 1 models have all five ratings · AHRI 218035871

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	Kerr	ZOKOP
COP at 5°F	beats 97% · 2.40A-KHP06SA-1Non-ducted, up to 1.5 tons	beats 71% · 2.10TSC-24HA2/I2XI18B-OAlso listed as TSC-24HA2/I2XI18B-ONon-ducted, 2 tons
Capacity retention at 5°F	beats 100% · 150%A-KZP06SA-1Also listed as A-ZKP06SA-1Non-ducted, up to 1.5 tons	beats 61% · 80%TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-ONon-ducted, up to 1.5 tons
HSPF2	beats 100% · 15.6A-KZP06SA-1Also listed as A-ZKP06SA-1Non-ducted, up to 1.5 tons	beats 80% · 10.5TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-ONon-ducted, 2.5–3 tons
SEER2	beats 100% · 27.0A-ZKP15SA-1Ducted, up to 1.5 tons	beats 91% · 24.0TMSC-27HA2/I2XI19B-OAlso listed as TMSC-27HA2/I2XI19B-ONon-ducted, 2.5–3 tons
EER2	beats 99% · 18.0A-KHP06SA-1Non-ducted, up to 1.5 tons	beats 70% · 13.0TMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-ONon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 99% · 22,600 Btu/hA-KZP18SA-1Also listed as A-ZKP18SA-1Non-ducted, up to 1.5 tons	beats 88% · 16,000 Btu/hTMSC-18HA2/I2XI20B-OAlso listed as TMSC-18HA2/I2XI20B-ONon-ducted, up to 1.5 tons

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Kerr vs ZOKOP heat pumps