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.

Custom Comfort and Nutech 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, Custom Comfort scores higher on 6 of the 6 ratings.

Custom Comfort
Nutech
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Custom Comfort	Nutech
Efficiency index	71% (higher)median —	54% (higher)median —
COP at 5°F	64% (higher)median 2.00	58% (higher)median 2.00
Capacity retention at 5°F	71% (higher)median 91%	42% (higher)median 70%
HSPF2	84% (higher)median 10.6	60% (higher)median 9.2
SEER2	69% (higher)median 20.8	64% (higher)median 19.3
EER2	67% (higher)median 12.3	43% (higher)median 11.0
Heating capacity at 5°F	72% (higher)median 22,900 Btu/h	52% (higher)median 19,550 Btu/h
Outdoor models	28	28
AHRI certifications	103	40

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Custom Comfort	Nutech
CEE 2025 Tier 1 (Split ASHP)	96.4%27 models	85.7%24 models
CEE 2026 Tier 1 (Split ASHP)	96.4%27 models	78.6%22 models
CEE Advanced Tier (Split ASHP)	3.6%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	100%28 models	60.7%17 models
DOE Cold Climate Heat Pump Challenge	3.6%1 models	0%0 models
ENERGY STAR Cold Climate	100%28 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 · 8 groups where both have models

Custom Comfort
Nutech
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	Custom Comfort	Nutech
Ducted, up to 1.5 tons	10 · index 78%	5 · index 70%
Ducted, 2 tons	4 · index 71%	3 · index 65%
Ducted, 2.5–3 tons	7 · index 72%	4 · index 54%
Ducted, 3.5–4.5 tons	6 · index 64%	6 · index 57%
Ducted, 5 tons and up	None	2 · index 64%
Non-ducted, up to 1.5 tons	10 · index 75%	6 · index 41%
Non-ducted, 2 tons	2 · index 82%	2 · index 43%
Non-ducted, 2.5–3 tons	6 · index 65%	3 · index 42%
Non-ducted, 3.5–4.5 tons	4 · index 51%	1 · index 51%
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	Custom ComfortCold-climate score, best model	NutechCold-climate score, best model
Ducted, up to 1.5 tons	93.5(50 is the typical model of its size class) (higher)CCOXHBSZ06HPwith ducted air handler CCOXHBSD0610 of 10 models qualify · AHRI 215745983	81.3(50 is the typical model of its size class)NOX230-09HFN10-M1with ducted air handler NTJ-09HWFN10-M1-D4 of 5 models qualify · AHRI 216578942
Ducted, 2 tons	85.7(50 is the typical model of its size class) (higher)CCOXHBSZ24HPwith ducted air handler CCOXHBSD244 of 4 models qualify · AHRI 215745987	77.1(50 is the typical model of its size class)NOD30-24HFN10-M1with ducted air handler NTJ-24HWFN10-M1-D3 of 3 models qualify · AHRI 215894267
Ducted, 2.5–3 tons	83.2(50 is the typical model of its size class) (higher)CCOXHBSZ36CHPwith ducted air handler CCOXHBSD367 of 7 models qualify · AHRI 215745999	60.6(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D2 of 4 models qualify · AHRI 215894278
Ducted, 3.5–4.5 tons	82.7(50 is the typical model of its size class) (higher)CCOXHBMZ648HP6 of 6 models qualify · AHRI 215746015	77.9(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D6 of 6 models qualify · AHRI 215894281
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	96.7(50 is the typical model of its size class) (higher)CCOXHBSZ06HPwith ductless indoor unit CCOXHBWM0610 of 10 models qualify · AHRI 215745973	65.6(50 is the typical model of its size class)N3OX430-18HFN10-M1-D3 of 6 models qualify · AHRI 215894273
Non-ducted, 2 tons	89.4(50 is the typical model of its size class) (higher)CCOXHBSZ24HPwith ductless indoor unit CCOXHB4C242 of 2 models qualify · AHRI 215745982	45.1(50 is the typical model of its size class)NOX430-24HFN10-230with ductless indoor unit NSAG11D-24HRFN10-2302 of 2 models qualify · AHRI 215894262
Non-ducted, 2.5–3 tons	89.4(50 is the typical model of its size class) (higher)CCOXHBSZ36CHPwith ductless indoor unit CCOXHBFC366 of 6 models qualify · AHRI 215746002	47.2(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D1 of 3 models qualify · AHRI 215894277
Non-ducted, 3.5–4.5 tons	73.4(50 is the typical model of its size class) (higher)CCOXHBMZ648HP4 of 4 models qualify · AHRI 215746016	60.1(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D1 of 1 models qualify · AHRI 215894282
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	Custom ComfortAll-around score, best model	NutechAll-around score, best model
Ducted, up to 1.5 tons	95.0(50 is the typical model of its size class) (higher)CCOXHBSZ06HPwith ducted air handler CCOXHBSD0610 of 10 models have all five ratings · AHRI 215745983	80.8(50 is the typical model of its size class)NOX230-09HFN10-M1with ducted air handler NTJ-09HWFN10-M1-D5 of 5 models have all five ratings · AHRI 216578942
Ducted, 2 tons	78.8(50 is the typical model of its size class)CCOESBSZ24HPwith ducted air handler CCOXHBSD244 of 4 models have all five ratings · AHRI 218425832	78.8(50 is the typical model of its size class)NOD30-24HFN10-M1with ducted air handler NTJ-24HWFN10-M1-D3 of 3 models have all five ratings · AHRI 215894267
Ducted, 2.5–3 tons	83.6(50 is the typical model of its size class) (higher)CCOXHBMZ536HP7 of 7 models have all five ratings · AHRI 215746012	69.5(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D4 of 4 models have all five ratings · AHRI 215894278
Ducted, 3.5–4.5 tons	83.9(50 is the typical model of its size class)CCOXHBMZ648HP6 of 6 models have all five ratings · AHRI 215746015	85.1(50 is the typical model of its size class) (higher)N6OE30-48HFN10-M1D-D6 of 6 models have all five ratings · AHRI 215894281
Ducted, 5 tons and up	No models in this size class	65.3(50 is the typical model of its size class)NOE30-60HFN10-M2with ducted air handler NHJ-60HWFN10-M2-D2 of 2 models have all five ratings · AHRI 215894270
Non-ducted, up to 1.5 tons	96.2(50 is the typical model of its size class) (higher)CCOXHBSZ06HPwith ductless indoor unit CCOXHBWM0610 of 10 models have all five ratings · AHRI 215745973	62.1(50 is the typical model of its size class)N3OX430-18HFN10-M1-D6 of 6 models have all five ratings · AHRI 215894271
Non-ducted, 2 tons	86.8(50 is the typical model of its size class) (higher)CCOESBSZ24HPwith ductless indoor unit CCOXHBWM242 of 2 models have all five ratings · AHRI 217968402	56.7(50 is the typical model of its size class)N4OD30-27HFN10-M1D-D2 of 2 models have all five ratings · AHRI 215894274
Non-ducted, 2.5–3 tons	78.3(50 is the typical model of its size class) (higher)CCOXHBMZ536HP6 of 6 models have all five ratings · AHRI 215746011	58.3(50 is the typical model of its size class)N5OD30-36HFN10-M1D-D3 of 3 models have all five ratings · AHRI 215894277
Non-ducted, 3.5–4.5 tons	75.6(50 is the typical model of its size class) (higher)CCOXHBMZ648HP4 of 4 models have all five ratings · AHRI 215746014	52.8(50 is the typical model of its size class)N6OE30-48HFN10-M1D-D1 of 1 models have all five ratings · AHRI 215894282
Non-ducted, 5 tons and up	No models in this size class	32.5(50 is the typical model of its size class)N6OE30-60HFN10-M1D-D1 of 1 models have all five ratings · AHRI 215894283

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	Custom Comfort	Nutech
COP at 5°F	beats 99% · 2.51CCOESBSZ12HPNon-ducted, up to 1.5 tons	beats 95% · 2.44NOX230-12HFN10-M1Ducted, up to 1.5 tons
Capacity retention at 5°F	beats 98% · 126%CCOXHBSZ09HPNon-ducted, up to 1.5 tons	beats 84% · 93%NWDB-48HI1N4S4-M-SE18Ducted, 3.5–4.5 tons
HSPF2	beats 99% · 14.8CCOXHBSZ06HPNon-ducted, up to 1.5 tons	beats 95% · 11.5NOX230-09HFN10-M1Ducted, up to 1.5 tons
SEER2	beats 97% · 25.0CCOESBMZ427HPNon-ducted, 2.5–3 tons	beats 96% · 20.4N6OE30-48HFN10-M1D-DDucted, 3.5–4.5 tons
EER2	beats 99% · 18.0CCOXHBSZ06HPNon-ducted, up to 1.5 tons	beats 91% · 13.3NOX430-18HFN10-M1Ducted, up to 1.5 tons
Heating capacity at 5°F	beats 98% · 39,500 Btu/hCCOXHBSZ36CHPNon-ducted, 2.5–3 tons	beats 83% · 14,000 Btu/hN3OX430-18HFN10-M1-DNon-ducted, up to 1.5 tons

More comparisons

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Custom Comfort vs Nutech heat pumps