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.

Star Air Kontrol and YONAN 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, Star Air Kontrol scores higher on 5 of the 6 ratings.

Star Air Kontrol
YONAN
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Star Air Kontrol	YONAN
Efficiency index	56% (higher)median —	51% (higher)median —
COP at 5°F	61%median 2.10	66%median 2.00
Capacity retention at 5°F	46% (higher)median 72%	44% (higher)median 74%
HSPF2	66% (higher)median 9.6	43% (higher)median 9.5
SEER2	62% (higher)median 19.0	47% (higher)median 21.0
EER2	45% (higher)median 11.0	43% (higher)median 12.0
Heating capacity at 5°F	51% (higher)median 19,700 Btu/h	45% (higher)median 12,600 Btu/h
Outdoor models	51	27
AHRI certifications	64	27

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Star Air Kontrol	YONAN
CEE 2025 Tier 1 (Split ASHP)	84.3%43 models	63%17 models
CEE 2026 Tier 1 (Split ASHP)	78.4%40 models	63%17 models
CEE Advanced Tier (Split ASHP)	2%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	70.6%36 models	63%17 models
DOE Cold Climate Heat Pump Challenge	2%1 models	0%0 models
ENERGY STAR Cold Climate	49%25 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 · 3 groups where both have models

Star Air Kontrol
YONAN
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	Star Air Kontrol	YONAN
Ducted, up to 1.5 tons	6 · index 72%	None
Ducted, 2 tons	6 · index 64%	None
Ducted, 2.5–3 tons	7 · index 60%	None
Ducted, 3.5–4.5 tons	10 · index 54%	None
Ducted, 5 tons and up	2 · index 64%	None
Non-ducted, up to 1.5 tons	14 · index 54%	16 · index 46%
Non-ducted, 2 tons	3 · index 52%	7 · index 54%
Non-ducted, 2.5–3 tons	6 · index 42%	4 · index 62%
Non-ducted, 3.5–4.5 tons	2 · index 43%	None
Non-ducted, 5 tons and up	1 · index 27%	None

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	Star Air KontrolCold-climate score, best model	YONANCold-climate score, best model
Ducted, up to 1.5 tons	93.5(50 is the typical model of its size class)SAK-06-DT2/220Vwith ducted air handler SAK-06-DT1/220V5 of 6 models qualify · AHRI 216369214	No models in this size class
Ducted, 2 tons	77.1(50 is the typical model of its size class)SAK-24-DT2/220Vwith ducted air handler SAK-24-DT1/220V7 of 7 models qualify · AHRI 216369218	No models in this size class
Ducted, 2.5–3 tons	64.5(50 is the typical model of its size class)S36SCQ2Cwith ducted air handler S36AUPDA4 of 6 models qualify · AHRI 218806027	No models in this size class
Ducted, 3.5–4.5 tons	77.9(50 is the typical model of its size class)SAK-48-QZ/220V10 of 10 models qualify · AHRI 216369242	No models in this size class
Ducted, 5 tons and up	None on this board (0 of 2 models qualify)	No models in this size class
Non-ducted, up to 1.5 tons	94.4(50 is the typical model of its size class) (higher)SAK-06-OCT2/220Vwith ductless indoor unit SAK-06-OCT1/220V9 of 14 models qualify · AHRI 216369228	79.3(50 is the typical model of its size class)YSA25-18HRDN8OUwith ductless indoor unit YSA25-18HRDN8IN11 of 16 models qualify · AHRI 218451518
Non-ducted, 2 tons	73.7(50 is the typical model of its size class)SAK-24-CT2/220Vwith ductless indoor unit SAK-24-CT1/220V3 of 3 models qualify · AHRI 216369225	77.5(50 is the typical model of its size class) (higher)YSA22-24HRDN8OUwith ductless indoor unit YSA22-24HRDN8IN3 of 7 models qualify · AHRI 218451515
Non-ducted, 2.5–3 tons	62.8(50 is the typical model of its size class) (higher)SAK-36-CT2/220Vwith ductless indoor unit SAK-36-CT1/220V4 of 6 models qualify · AHRI 216369226	58.8(50 is the typical model of its size class)YSAMO-42HRN13 of 4 models qualify · AHRI 217015811
Non-ducted, 3.5–4.5 tons	60.1(50 is the typical model of its size class)SAK-48-QZ/220V2 of 2 models qualify · AHRI 216369243	No models in this size class
Non-ducted, 5 tons and up	None on this board (0 of 1 models qualify)	No models in this size class

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	Star Air KontrolAll-around score, best model	YONANAll-around score, best model
Ducted, up to 1.5 tons	95.0(50 is the typical model of its size class)SAK-06-DT2/220Vwith ducted air handler SAK-06-DT1/220V6 of 6 models have all five ratings · AHRI 216369214	No models in this size class
Ducted, 2 tons	79.6(50 is the typical model of its size class)SAK-24SQN2-M18Mwith ducted air handler SAK-24SQN1-M18MAlso listed as SAK-36SQN2-M18M7 of 7 models have all five ratings · AHRI 218612775	No models in this size class
Ducted, 2.5–3 tons	69.9(50 is the typical model of its size class)S27TZL2C*6 of 6 models have all five ratings · AHRI 218374496	No models in this size class
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class)SAK-48-QZ/220V10 of 10 models have all five ratings · AHRI 216369242	No models in this size class
Ducted, 5 tons and up	65.3(50 is the typical model of its size class)SAK-60-DT2/220Vwith ducted air handler SAK-60-DT1/220V2 of 2 models have all five ratings · AHRI 216369221	No models in this size class
Non-ducted, up to 1.5 tons	85.0(50 is the typical model of its size class) (higher)SAK-06-OCT2/220Vwith ductless indoor unit SAK-06-OCT1/220V14 of 14 models have all five ratings · AHRI 216369228	83.0(50 is the typical model of its size class)YSA25-18HRDN8OUwith ductless indoor unit YSA25-18HRDN8IN14 of 16 models have all five ratings · AHRI 218451518
Non-ducted, 2 tons	66.2(50 is the typical model of its size class)SAK-24-CT2/220Vwith ductless indoor unit SAK-24-CT1/220V3 of 3 models have all five ratings · AHRI 216369225	86.5(50 is the typical model of its size class) (higher)YSA25-24HRDN8OUwith ductless indoor unit YSA25-24HRDN8IN7 of 7 models have all five ratings · AHRI 218451519
Non-ducted, 2.5–3 tons	65.1(50 is the typical model of its size class)S27TZL2C*6 of 6 models have all five ratings · AHRI 218426452	66.6(50 is the typical model of its size class) (higher)YSAMO-30HRN13 of 4 models have all five ratings · AHRI 217015809
Non-ducted, 3.5–4.5 tons	52.8(50 is the typical model of its size class)SAK-48-QZ/220V2 of 2 models have all five ratings · AHRI 216369243	No models in this size class
Non-ducted, 5 tons and up	32.5(50 is the typical model of its size class)SAK-60-QZ/220V1 of 1 models have all five ratings · AHRI 216369244	No models in this size class

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	Star Air Kontrol	YONAN
COP at 5°F	beats 98% · 2.47SAK-12-OCT2/220VNon-ducted, up to 1.5 tons	beats 96% · 2.21YSA-36HRDN1-21Non-ducted, 2.5–3 tons
Capacity retention at 5°F	beats 94% · 100%S48SCQ2CDucted, 3.5–4.5 tons	beats 83% · 98%Y21SQ-09HRDN2OUNon-ducted, up to 1.5 tons
HSPF2	beats 99% · 13.8SAK-06-DT2/220VDucted, up to 1.5 tons	beats 84% · 10.5YSA25-24HRDN8OUNon-ducted, 2 tons
SEER2	beats 99% · 22.0S27TZL2C*Ducted, 2.5–3 tons	beats 95% · 25.0YSA25-24HRDN8OUNon-ducted, 2 tons
EER2	beats 99% · 14.4SAK-06-DT2/220VDucted, up to 1.5 tons	beats 96% · 14.0YSA25-24HRDN8OUNon-ducted, 2 tons
Heating capacity at 5°F	beats 91% · 50,000 Btu/hS60SCQ2CDucted, 3.5–4.5 tons	beats 86% · 15,000 Btu/hYSA25-18HRDN8OUNon-ducted, up to 1.5 tons

More comparisons

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Star Air Kontrol vs YONAN heat pumps