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.

BOREAL and Star Air Kontrol 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, BOREAL and Star Air Kontrol split the 6 ratings 3–3.

BOREAL
Star Air Kontrol
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	BOREAL	Star Air Kontrol
Efficiency index	53%median —	56%median —
COP at 5°F	43%median 1.98	61%median 2.10
Capacity retention at 5°F	59% (higher)median 79%	46% (higher)median 72%
HSPF2	41%median 9.0	66%median 9.6
SEER2	59%median 19.0	62%median 19.0
EER2	58% (higher)median 12.0	45% (higher)median 11.0
Heating capacity at 5°F	56% (higher)median 17,500 Btu/h	51% (higher)median 19,700 Btu/h
Outdoor models	49	51
AHRI certifications	129	64

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	BOREAL	Star Air Kontrol
CEE 2025 Tier 1 (Split ASHP)	87.8%43 models	84.3%43 models
CEE 2026 Tier 1 (Split ASHP)	87.8%43 models	78.4%40 models
CEE Advanced Tier (Split ASHP)	6.1%3 models	2%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	87.8%43 models	70.6%36 models
DOE Cold Climate Heat Pump Challenge	6.1%3 models	2%1 models
ENERGY STAR Cold Climate	61.2%30 models	49%25 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

BOREAL
Star Air Kontrol
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	BOREAL	Star Air Kontrol
Ducted, up to 1.5 tons	8 · index 65%	6 · index 72%
Ducted, 2 tons	6 · index 60%	6 · index 64%
Ducted, 2.5–3 tons	11 · index 55%	7 · index 60%
Ducted, 3.5–4.5 tons	7 · index 71%	10 · index 54%
Ducted, 5 tons and up	None	2 · index 64%
Non-ducted, up to 1.5 tons	22 · index 47%	14 · index 54%
Non-ducted, 2 tons	6 · index 49%	3 · index 52%
Non-ducted, 2.5–3 tons	6 · index 42%	6 · index 42%
Non-ducted, 3.5–4.5 tons	2 · index 39%	2 · index 43%
Non-ducted, 5 tons and up	None	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	BOREALCold-climate score, best model	Star Air KontrolCold-climate score, best model
Ducted, up to 1.5 tons	69.9(50 is the typical model of its size class)KUL09HPJ132OAwith ducted air handler DUC09HPJ132IAAlso listed as NOV09HPJ132OA7 of 8 models qualify · AHRI 215560267	93.5(50 is the typical model of its size class) (higher)SAK-06-DT2/220Vwith ducted air handler SAK-06-DT1/220V5 of 6 models qualify · AHRI 216369214
Ducted, 2 tons	76.2(50 is the typical model of its size class)ENX24HPJ132OAwith ducted air handler ENX24HPJ132IA5 of 6 models qualify · AHRI 215420685	77.1(50 is the typical model of its size class) (higher)SAK-24-DT2/220Vwith ducted air handler SAK-24-DT1/220V7 of 7 models qualify · AHRI 216369218
Ducted, 2.5–3 tons	76.9(50 is the typical model of its size class) (higher)ENX36HPJ132OAwith ducted air handler ENX36HPJ132IAAlso listed as ARX36HPJ1R32OA6 of 11 models qualify · AHRI 215420682	64.5(50 is the typical model of its size class)S36SCQ2Cwith ducted air handler S36AUPDA4 of 6 models qualify · AHRI 218806027
Ducted, 3.5–4.5 tons	85.1(50 is the typical model of its size class) (higher)ENX60HPJ132OAwith ducted air handler ENX60HPJ132IAAlso listed as ARX60HPJ1R32OA6 of 7 models qualify · AHRI 215420683	77.9(50 is the typical model of its size class)SAK-48-QZ/220V10 of 10 models qualify · AHRI 216369242
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 2 models qualify)
Non-ducted, up to 1.5 tons	63.1(50 is the typical model of its size class)KUL09HPL132OAwith ductless indoor unit KUL09HPL132IAAlso listed as NOV09HPL132OA21 of 22 models qualify · AHRI 215424783	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
Non-ducted, 2 tons	67.5(50 is the typical model of its size class)MUL24HPJ132OA5 of 6 models qualify · AHRI 215424769	73.7(50 is the typical model of its size class) (higher)SAK-24-CT2/220Vwith ductless indoor unit SAK-24-CT1/220V3 of 3 models qualify · AHRI 216369225
Non-ducted, 2.5–3 tons	77.2(50 is the typical model of its size class) (higher)MUL36HPJ132OA6 of 6 models qualify · AHRI 215424771	62.8(50 is the typical model of its size class)SAK-36-CT2/220Vwith ductless indoor unit SAK-36-CT1/220V4 of 6 models qualify · AHRI 216369226
Non-ducted, 3.5–4.5 tons	66.5(50 is the typical model of its size class) (higher)MUL42HPJ132OA2 of 2 models qualify · AHRI 215424772	60.1(50 is the typical model of its size class)SAK-48-QZ/220V2 of 2 models qualify · AHRI 216369243
Non-ducted, 5 tons and up	No models in this size class	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	BOREALAll-around score, best model	Star Air KontrolAll-around score, best model
Ducted, up to 1.5 tons	83.6(50 is the typical model of its size class)KUL09HPJ132OAwith ducted air handler DUC09HPJ132IAAlso listed as NOV09HPJ132OA8 of 8 models have all five ratings · AHRI 215560267	95.0(50 is the typical model of its size class) (higher)SAK-06-DT2/220Vwith ducted air handler SAK-06-DT1/220V6 of 6 models have all five ratings · AHRI 216369214
Ducted, 2 tons	73.1(50 is the typical model of its size class)ENX24HPJ132OAwith ducted air handler ENX24HPJ132IA7 of 7 models have all five ratings · AHRI 215420685	79.6(50 is the typical model of its size class) (higher)SAK-24SQN2-M18Mwith ducted air handler SAK-24SQN1-M18MAlso listed as SAK-36SQN2-M18M7 of 7 models have all five ratings · AHRI 218612775
Ducted, 2.5–3 tons	64.6(50 is the typical model of its size class)BRS36HPJ132OAwith ducted air handler DUC36HPJ132IA10 of 10 models have all five ratings · AHRI 215560257	69.9(50 is the typical model of its size class) (higher)S27TZL2C*6 of 6 models have all five ratings · AHRI 218374496
Ducted, 3.5–4.5 tons	83.1(50 is the typical model of its size class)ENX48HPJ132OAwith ducted air handler ENX48HPJ132IAAlso listed as ENX60HPJ132OA, ARX60HPJ1R32OA7 of 7 models have all five ratings · AHRI 215420684	85.1(50 is the typical model of its size class) (higher)SAK-48-QZ/220V10 of 10 models have all five ratings · AHRI 216369242
Ducted, 5 tons and up	No models in this size class	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
Non-ducted, up to 1.5 tons	78.7(50 is the typical model of its size class)KUL09HPL132OAwith ductless indoor unit KUL09HPL132IAAlso listed as NOV09HPL132OA22 of 22 models have all five ratings · AHRI 215424783	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
Non-ducted, 2 tons	72.2(50 is the typical model of its size class) (higher)KUL24HPJ132OAwith ductless indoor unit KUL24HPJ132IA5 of 6 models have all five ratings · AHRI 215424817	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
Non-ducted, 2.5–3 tons	70.5(50 is the typical model of its size class) (higher)MUL30HPJ132OA6 of 6 models have all five ratings · AHRI 215424770	65.1(50 is the typical model of its size class)S27TZL2C*6 of 6 models have all five ratings · AHRI 218426452
Non-ducted, 3.5–4.5 tons	67.7(50 is the typical model of its size class) (higher)MUL42HPJ132OA2 of 2 models have all five ratings · AHRI 215424772	52.8(50 is the typical model of its size class)SAK-48-QZ/220V2 of 2 models have all five ratings · AHRI 216369243
Non-ducted, 5 tons and up	No models in this size class	32.5(50 is the typical model of its size class)SAK-60-QZ/220V1 of 1 models have all five ratings · AHRI 216369244

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	BOREAL	Star Air Kontrol
COP at 5°F	beats 88% · 2.10MUL36HPJ132OANon-ducted, 2.5–3 tons	beats 98% · 2.47SAK-12-OCT2/220VNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 94% · 100%ENX60HPJ132OADucted, 3.5–4.5 tons	beats 94% · 100%S48SCQ2CDucted, 3.5–4.5 tons
HSPF2	beats 90% · 10.5ENX60HPJ132OAAlso listed as ARX60HPJ1R32OADucted, 3.5–4.5 tons	beats 99% · 13.8SAK-06-DT2/220VDucted, up to 1.5 tons
SEER2	beats 99% · 22.5KUL18HPJ132OADucted, up to 1.5 tons	beats 99% · 22.0S27TZL2C*Ducted, 2.5–3 tons
EER2	beats 97% · 14.2KUL09HPJ132OAAlso listed as NOV09HPJ132OADucted, up to 1.5 tons	beats 99% · 14.4SAK-06-DT2/220VDucted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 54,000 Btu/hENX60HPJ132OAAlso listed as ARX60HPJ1R32OADucted, 3.5–4.5 tons	beats 91% · 50,000 Btu/hS60SCQ2CDucted, 3.5–4.5 tons

More comparisons

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BOREAL vs Star Air Kontrol heat pumps