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 IAIR 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, Daizuki scores higher on 5 of the 6 ratings.

Daizuki
IAIR
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Daizuki	IAIR
Efficiency index	52% (higher)median —	18% (higher)median —
COP at 5°F	39% (higher)median 1.80	2% (higher)median 1.40
Capacity retention at 5°F	43% (higher)median 70%	4% (higher)median 36%
HSPF2	40% (higher)median 8.5	19% (higher)median 7.5
SEER2	52% (higher)median 19.0	15% (higher)median 14.3
EER2	43%median 10.0	60%median 11.5
Heating capacity at 5°F	42% (higher)median 11,600 Btu/h	4% (higher)median 13,300 Btu/h
Outdoor models	34	35
AHRI certifications	54	103

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Daizuki	IAIR
CEE 2025 Tier 1 (Split ASHP)	58.8%20 models	0%0 models
CEE 2026 Tier 1 (Split ASHP)	55.9%19 models	0%0 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	41.2%14 models	0%0 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	0%0 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 · 4 groups where both have models

Daizuki
IAIR
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	IAIR
Ducted, up to 1.5 tons	4 · index 68%	3 · index —
Ducted, 2 tons	1 · index 84%	5 · index 12%
Ducted, 2.5–3 tons	2 · index 66%	10 · index 16%
Ducted, 3.5–4.5 tons	1 · index 64%	15 · index 21%
Ducted, 5 tons and up	None	2 · index 19%
Non-ducted, up to 1.5 tons	21 · index 46%	None
Non-ducted, 2 tons	5 · index 42%	None
Non-ducted, 2.5–3 tons	7 · index 53%	None
Non-ducted, 3.5–4.5 tons	1 · index 59%	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	DaizukiCold-climate score, best model	IAIRCold-climate score, best model
Ducted, up to 1.5 tons	70.4(50 is the typical model of its size class)DXLC-0923-1Zwith ducted air handler DXFU09E426-203 of 4 models qualify · AHRI 216021067	None on this board (0 of 3 models qualify)
Ducted, 2 tons	80.3(50 is the typical model of its size class)DXLC-2423-1Zwith ducted air handler DXFU24E426-211 of 1 models qualify · AHRI 216021070	None on this board (0 of 5 models qualify)
Ducted, 2.5–3 tons	None on this board (0 of 2 models qualify)	None on this board (0 of 10 models qualify)
Ducted, 3.5–4.5 tons	None on this board (0 of 1 models qualify)	None on this board (0 of 15 models qualify)
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	86.0(50 is the typical model of its size class)DXLC-0923-1Zwith ductless indoor unit DXMH09E426-2511 of 21 models qualify · AHRI 216021063	No models in this size class
Non-ducted, 2 tons	74.1(50 is the typical model of its size class)DXLC-2423-1Zwith ductless indoor unit DXFC24E426-201 of 5 models qualify · AHRI 217196893	No models in this size class
Non-ducted, 2.5–3 tons	53.0(50 is the typical model of its size class)DXFM-2723-3Z1 of 7 models qualify · AHRI 211994914	No models in this size class
Non-ducted, 3.5–4.5 tons	26.3(50 is the typical model of its size class)DXFM-4823-5Z1 of 1 models qualify · AHRI 211994920	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	DaizukiAll-around score, best model	IAIRAll-around score, best model
Ducted, up to 1.5 tons	78.5(50 is the typical model of its size class)DXLC-1823-1Zwith ducted air handler DXFU18E426-194 of 4 models have all five ratings · AHRI 216021069	None on this board (0 of 3 models have all five ratings)
Ducted, 2 tons	83.8(50 is the typical model of its size class) (higher)DXLC-2423-1Zwith ducted air handler DXFU24E426-211 of 1 models have all five ratings · AHRI 216021070	12.4(50 is the typical model of its size class)APH3024E100AAlso listed as IPH3024E100A2 of 5 models have all five ratings · AHRI 211289991
Ducted, 2.5–3 tons	75.5(50 is the typical model of its size class) (higher)DXFM-2723-3Z2 of 2 models have all five ratings · AHRI 211994915	17.3(50 is the typical model of its size class)APH3036E100AAlso listed as IPH3036E100A4 of 10 models have all five ratings · AHRI 212255584
Ducted, 3.5–4.5 tons	63.5(50 is the typical model of its size class) (higher)DXFM-4823-5Z1 of 1 models have all five ratings · AHRI 211994921	21.5(50 is the typical model of its size class)APH3048E100AAlso listed as IPH3048E100A4 of 15 models have all five ratings · AHRI 212255588
Ducted, 5 tons and up	No models in this size class	19.3(50 is the typical model of its size class)APH3060E100AAlso listed as IPH3060E100A2 of 2 models have all five ratings · AHRI 212255589
Non-ducted, up to 1.5 tons	88.4(50 is the typical model of its size class)DXLC-0923-1Zwith ductless indoor unit DXMH09E426-2515 of 21 models have all five ratings · AHRI 216021063	No models in this size class
Non-ducted, 2 tons	77.5(50 is the typical model of its size class)DXLC-2423-1Zwith ductless indoor unit DXMH24E426-204 of 5 models have all five ratings · AHRI 216021066	No models in this size class
Non-ducted, 2.5–3 tons	73.9(50 is the typical model of its size class)DXFM-2723-3Z3 of 7 models have all five ratings · AHRI 211994914	No models in this size class
Non-ducted, 3.5–4.5 tons	59.4(50 is the typical model of its size class)DXFM-4823-5Z1 of 1 models have all five ratings · AHRI 211994920	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	Daizuki	IAIR
COP at 5°F	beats 92% · 2.28DXLC-1223-1ZNon-ducted, up to 1.5 tons	beats 4% · 1.40APH3060E100AAlso listed as IPH3060E100ADucted, 5 tons and up
Capacity retention at 5°F	beats 71% · 86%DXLC-0923-1ZNon-ducted, up to 1.5 tons	beats 5% · 38%APH3060E100AAlso listed as IPH3060E100ADucted, 5 tons and up
HSPF2	beats 98% · 11.2DXLC-2423-1ZDucted, 2 tons	beats 39% · 7.8AHP5042E1000AAlso listed as IHP5042E1000ADucted, 3.5–4.5 tons
SEER2	beats 99% · 24.6DXFM-2723-3ZNon-ducted, 2.5–3 tons	beats 40% · 15.2AHP5042E1000AAlso listed as IHP5042E1000ADucted, 3.5–4.5 tons
EER2	beats 97% · 14.0DXLC-2423-1ZNon-ducted, 2 tons	beats 82% · 12.0AHP5042E1000AAlso listed as IHP5042E1000ADucted, 3.5–4.5 tons
Heating capacity at 5°F	beats 85% · 14,000 Btu/hDXFM-1823-2ZNon-ducted, up to 1.5 tons	beats 11% · 21,600 Btu/hAPH3060E100AAlso listed as IPH3060E100ADucted, 5 tons and up

More comparisons

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Daizuki vs IAIR heat pumps