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.

DIAL and WABBAN 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, DIAL scores higher on 4 of the 6 ratings.

DIAL
WABBAN
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	DIAL	WABBAN
Efficiency index	55% (higher)median —	50% (higher)median —
COP at 5°F	44% (higher)median 1.84	35% (higher)median 1.81
Capacity retention at 5°F	58%median 72%	60%median 75%
HSPF2	51% (higher)median 9.0	40% (higher)median 8.5
SEER2	55% (higher)median 20.5	49% (higher)median 20.0
EER2	54% (higher)median 12.5	48% (higher)median 11.3
Heating capacity at 5°F	55%median 13,200 Btu/h	56%median 16,100 Btu/h
Outdoor models	40	41
AHRI certifications	50	63

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	DIAL	WABBAN
CEE 2025 Tier 1 (Split ASHP)	82.5%33 models	56.1%23 models
CEE 2026 Tier 1 (Split ASHP)	82.5%33 models	53.7%22 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	70%28 models	51.2%21 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	60%24 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 · 7 groups where both have models

DIAL
WABBAN
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	DIAL	WABBAN
Ducted, up to 1.5 tons	4 · index 50%	2 · index 43%
Ducted, 2 tons	4 · index 62%	2 · index 36%
Ducted, 2.5–3 tons	4 · index 72%	6 · index 43%
Ducted, 3.5–4.5 tons	2 · index 51%	4 · index 41%
Non-ducted, up to 1.5 tons	24 · index 50%	22 · index 52%
Non-ducted, 2 tons	8 · index 56%	5 · index 63%
Non-ducted, 2.5–3 tons	4 · index 63%	6 · index 60%

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	DIALCold-climate score, best model	WABBANCold-climate score, best model
Ducted, up to 1.5 tons	55.9(50 is the typical model of its size class) (higher)9000-UNI-Owith ducted air handler 9000Z-DUC-I3 of 4 models qualify · AHRI 206838609	37.0(50 is the typical model of its size class)BB12HXP2A1DO*with ducted air handler BBM12HSFDI2 of 2 models qualify · AHRI 216743379
Ducted, 2 tons	64.8(50 is the typical model of its size class) (higher)24000-UNI-Owith ducted air handler 24000Z-DUC-I4 of 4 models qualify · AHRI 206838612	55.6(50 is the typical model of its size class)BB36-24WADUwith ducted air handler BBD24-24AH2ADU2 of 3 models qualify · AHRI 207196961
Ducted, 2.5–3 tons	78.1(50 is the typical model of its size class) (higher)36000-UNI-Owith ducted air handler 36000U-DUC-I4 of 4 models qualify · AHRI 206838613	54.7(50 is the typical model of its size class)BBM30HX4O*3 of 5 models qualify · AHRI 216743364
Ducted, 3.5–4.5 tons	None on this board (0 of 2 models qualify)	60.3(50 is the typical model of its size class)BB60-48WADUwith ducted air handler BBD48-24AH2ADU1 of 4 models qualify · AHRI 207196959
Non-ducted, up to 1.5 tons	79.7(50 is the typical model of its size class)9000-UNI-Owith ductless indoor unit 9000Z-CAS-I15 of 24 models qualify · AHRI 206838614	80.1(50 is the typical model of its size class) (higher)BB09HQ4D6DO*with ductless indoor unit BB09HQ4D6DI13 of 22 models qualify · AHRI 216743350
Non-ducted, 2 tons	72.0(50 is the typical model of its size class)24000-UNI-Owith ductless indoor unit 24000Z-CAS-IAlso listed as SZUN24WW2307 of 8 models qualify · AHRI 206838617	76.1(50 is the typical model of its size class) (higher)BBM24HX4O*3 of 5 models qualify · AHRI 216743360
Non-ducted, 2.5–3 tons	77.2(50 is the typical model of its size class) (higher)36000-UNI-Owith ductless indoor unit 36000U-CAS-IAlso listed as SZUN36WW2304 of 4 models qualify · AHRI 206838618	73.7(50 is the typical model of its size class)BBM42HX4O*5 of 6 models qualify · AHRI 216743358

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	DIALAll-around score, best model	WABBANAll-around score, best model
Ducted, up to 1.5 tons	57.7(50 is the typical model of its size class) (higher)9000-UNI-Owith ducted air handler 9000Z-DUC-I4 of 4 models have all five ratings · AHRI 206838609	55.2(50 is the typical model of its size class)BB12HXP2A1DO*with ducted air handler BBM12HSFDI2 of 2 models have all five ratings · AHRI 216743379
Ducted, 2 tons	72.2(50 is the typical model of its size class) (higher)24000Z-03-OAlso listed as MZME24WW3P230BBJ4 of 4 models have all five ratings · AHRI 204793304	62.0(50 is the typical model of its size class)BB36-24WADUwith ducted air handler BBD24-24AH2ADU3 of 3 models have all five ratings · AHRI 207196961
Ducted, 2.5–3 tons	78.6(50 is the typical model of its size class) (higher)36000Z-04-OAlso listed as MZME36WW4P230BAJ4 of 4 models have all five ratings · AHRI 204793305	53.1(50 is the typical model of its size class)BBM30HX4O*5 of 5 models have all five ratings · AHRI 216743364
Ducted, 3.5–4.5 tons	57.1(50 is the typical model of its size class)48000-CHP-Owith ducted air handler 48000-CHP-AHU2 of 2 models have all five ratings · AHRI 207027469	64.3(50 is the typical model of its size class) (higher)BB60-48WADUwith ducted air handler BBD48-24AH2ADU4 of 4 models have all five ratings · AHRI 207196959
Non-ducted, up to 1.5 tons	65.9(50 is the typical model of its size class)9000-UNI-Owith ductless indoor unit 9000Z-CAS-I19 of 24 models have all five ratings · AHRI 206838614	88.7(50 is the typical model of its size class) (higher)BB09HQ4D6DO*with ductless indoor unit BB09HQ4D6DI15 of 22 models have all five ratings · AHRI 216743350
Non-ducted, 2 tons	71.3(50 is the typical model of its size class)24000Z-03-OAlso listed as MZME24WW3P230BBJ7 of 8 models have all five ratings · AHRI 204793306	76.3(50 is the typical model of its size class) (higher)BB24HQ3D6DO*with ductless indoor unit BB24HQ3D6DI3 of 5 models have all five ratings · AHRI 216743347
Non-ducted, 2.5–3 tons	69.5(50 is the typical model of its size class)36000Z-04-OAlso listed as MZME36WW4P230BAJ4 of 4 models have all five ratings · AHRI 204793307	70.2(50 is the typical model of its size class) (higher)BBM42HX4O*5 of 6 models have all five ratings · AHRI 216743358

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	DIAL	WABBAN
COP at 5°F	beats 96% · 2.2836000-UNI-OAlso listed as SZUN36WW230Non-ducted, 2.5–3 tons	beats 89% · 2.21BBM18HX4O*Non-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 99% · 113%36000Z-04-OAlso listed as MZME36WW4P230BAJNon-ducted, 2.5–3 tons	beats 99% · 144%BB09HQ4D6DO*Non-ducted, up to 1.5 tons
HSPF2	beats 83% · 9.536000-UNI-ODucted, 2.5–3 tons	beats 88% · 11.0BB09HQ4D6DO*Non-ducted, up to 1.5 tons
SEER2	beats 96% · 21.024000Z-03-OAlso listed as MZME24WW3P230BBJDucted, 2 tons	beats 96% · 27.5BB09UW3SXETE00/ONon-ducted, up to 1.5 tons
EER2	beats 84% · 12.536000Z-04-OAlso listed as MZME36WW4P230BAJNon-ducted, 2.5–3 tons	beats 99% · 16.6BB09HQ4D6DO*Non-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 92% · 18,000 Btu/hMZME18WW2P230BAJNon-ducted, up to 1.5 tons	beats 96% · 20,000 Btu/hBB18HQ3D6DO*Non-ducted, up to 1.5 tons

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DIAL vs WABBAN heat pumps