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.

DAIZUKI and Wells 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, Wells scores higher on 6 of the 6 ratings.

DAIZUKI
Wells
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	DAIZUKI	Wells
Efficiency index	47%median —	63%median —
COP at 5°F	39%median 1.93	64%median 2.10
Capacity retention at 5°F	41%median 71%	61%median 75%
HSPF2	47%median 10.0	74%median 10.0
SEER2	61%median 22.3	62%median 19.4
EER2	44%median 11.7	59%median 12.0
Heating capacity at 5°F	45%median 16,900 Btu/h	62%median 19,000 Btu/h
Outdoor models	12	37
AHRI certifications	12	121

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	DAIZUKI	Wells
CEE 2025 Tier 1 (Split ASHP)	91.7%11 models	86.5%32 models
CEE 2026 Tier 1 (Split ASHP)	91.7%11 models	83.8%31 models
CEE Advanced Tier (Split ASHP)	0%0 models	2.7%1 models
Xcel Energy Colorado cold-climate ASHP (2025)	75%9 models	81.1%30 models
DOE Cold Climate Heat Pump Challenge	0%0 models	2.7%1 models
ENERGY STAR Cold Climate	0%0 models	83.8%31 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

DAIZUKI
Wells
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	DAIZUKI	Wells
Ducted, up to 1.5 tons	None	9 · index 80%
Ducted, 2 tons	None	5 · index 73%
Ducted, 2.5–3 tons	None	7 · index 67%
Ducted, 3.5–4.5 tons	None	7 · index 63%
Ducted, 5 tons and up	None	1 · index 63%
Non-ducted, up to 1.5 tons	6 · index 50%	16 · index 58%
Non-ducted, 2 tons	2 · index 49%	4 · index 53%
Non-ducted, 2.5–3 tons	3 · index 41%	4 · index 54%
Non-ducted, 3.5–4.5 tons	1 · index 43%	3 · index 57%
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	DAIZUKICold-climate score, best model	WellsCold-climate score, best model
Ducted, up to 1.5 tons	No models in this size class	93.5(50 is the typical model of its size class)WOS-06PRE/230with ducted air handler WIDL-06MOC/2309 of 9 models qualify · AHRI 215864077
Ducted, 2 tons	No models in this size class	85.7(50 is the typical model of its size class)WOS-24PRE/230with ducted air handler WIDH-24MOC/2305 of 5 models qualify · AHRI 215864084
Ducted, 2.5–3 tons	No models in this size class	82.5(50 is the typical model of its size class)WOM-36HH5/2307 of 7 models qualify · AHRI 215864112
Ducted, 3.5–4.5 tons	No models in this size class	82.7(50 is the typical model of its size class)WOM-48HH6/2307 of 7 models qualify · AHRI 215864115
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	68.6(50 is the typical model of its size class)DXFMT-1824-2Z5 of 6 models qualify · AHRI 217500268	94.4(50 is the typical model of its size class) (higher)WOS-06PRE/230with ductless indoor unit WI1C-06MOC/23011 of 16 models qualify · AHRI 215864073
Non-ducted, 2 tons	58.0(50 is the typical model of its size class)DXTH24C526A-25with ductless indoor unit DXTH24E526A-251 of 2 models qualify · AHRI 217996674	89.4(50 is the typical model of its size class) (higher)WOS-24PRE/230with ductless indoor unit WI4C-24MOC/2304 of 4 models qualify · AHRI 215864072
Non-ducted, 2.5–3 tons	57.5(50 is the typical model of its size class)DXFMT-2724-3Z2 of 3 models qualify · AHRI 217500269	72.6(50 is the typical model of its size class) (higher)WOM-36HH5/2304 of 4 models qualify · AHRI 215864113
Non-ducted, 3.5–4.5 tons	32.0(50 is the typical model of its size class)DXFMT-4224-5Z1 of 1 models qualify · AHRI 217500271	69.9(50 is the typical model of its size class) (higher)WOM-60HH6/2303 of 3 models qualify · AHRI 215864119
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	DAIZUKIAll-around score, best model	WellsAll-around score, best model
Ducted, up to 1.5 tons	No models in this size class	95.0(50 is the typical model of its size class)WOS-06PRE/230with ducted air handler WIDL-06MOC/2309 of 9 models have all five ratings · AHRI 215864077
Ducted, 2 tons	No models in this size class	79.6(50 is the typical model of its size class)WDHP-2436T-Gwith ducted air handler WDAH-24MOC-G5 of 5 models have all five ratings · AHRI 217048501
Ducted, 2.5–3 tons	No models in this size class	83.6(50 is the typical model of its size class)WOM-36HH5/2307 of 7 models have all five ratings · AHRI 215864112
Ducted, 3.5–4.5 tons	No models in this size class	85.1(50 is the typical model of its size class)WOM-48RH6/2307 of 7 models have all five ratings · AHRI 215864100
Ducted, 5 tons and up	No models in this size class	62.5(50 is the typical model of its size class)WOM-60RH6/2301 of 1 models have all five ratings · AHRI 215864103
Non-ducted, up to 1.5 tons	74.4(50 is the typical model of its size class)DXTH12C526A-25with ductless indoor unit DXTH12E526A-256 of 6 models have all five ratings · AHRI 217996672	93.8(50 is the typical model of its size class) (higher)WOS-06PRE/230with ductless indoor unit WIHW-06MOC/23016 of 16 models have all five ratings · AHRI 215864044
Non-ducted, 2 tons	56.1(50 is the typical model of its size class)DXTH24C526A-25with ductless indoor unit DXTH24E526A-252 of 2 models have all five ratings · AHRI 217996674	74.3(50 is the typical model of its size class) (higher)WOS-24QUA/230with ductless indoor unit WIHW-24MOC/2304 of 4 models have all five ratings · AHRI 215864043
Non-ducted, 2.5–3 tons	65.1(50 is the typical model of its size class)DXFMT-2724-3Z3 of 3 models have all five ratings · AHRI 217500269	66.3(50 is the typical model of its size class) (higher)WOM-36HH5/2304 of 4 models have all five ratings · AHRI 215864111
Non-ducted, 3.5–4.5 tons	42.9(50 is the typical model of its size class)DXFMT-4224-5Z1 of 1 models have all five ratings · AHRI 217500271	62.6(50 is the typical model of its size class) (higher)WOM-60HH6/2303 of 3 models have all five ratings · AHRI 215864117
Non-ducted, 5 tons and up	No models in this size class	32.5(50 is the typical model of its size class)WOM-60RH6/2301 of 1 models have all five ratings · AHRI 215864102

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	DAIZUKI	Wells
COP at 5°F	beats 88% · 2.25DXTH24C626A-21Non-ducted, 2 tons	beats 99% · 2.51WOS-12QUA/230Non-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 87% · 100%DXTH12C526A-25Non-ducted, up to 1.5 tons	beats 98% · 126%WOS-09PRE/230Non-ducted, up to 1.5 tons
HSPF2	beats 80% · 10.5DXFMT-2724-3ZNon-ducted, 2.5–3 tons	beats 99% · 11.0WOM-48HH6/230Ducted, 3.5–4.5 tons
SEER2	beats 91% · 24.0DXFMT-2724-3ZNon-ducted, 2.5–3 tons	beats 96% · 20.4WOM-48RH6/230Ducted, 3.5–4.5 tons
EER2	beats 83% · 14.0DXTH12C526A-25Non-ducted, up to 1.5 tons	beats 99% · 14.4WOS-06PRE/230Ducted, up to 1.5 tons
Heating capacity at 5°F	beats 90% · 17,800 Btu/hDXTH18C526A-25Non-ducted, up to 1.5 tons	beats 97% · 39,000 Btu/hWDHP-36HHDucted, 2.5–3 tons

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DAIZUKI vs Wells heat pumps