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.

HAXXAIR and HITACHI 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, HITACHI scores higher on 4 of the 6 ratings.

HAXXAIR
HITACHI
Other ranked manufacturers

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

Average peer percentile, raw median and rank among ranked manufacturers
Rating	HAXXAIR	HITACHI
Efficiency index	57%median —	58%median —
COP at 5°F	58%median 2.07	72%median 2.25
Capacity retention at 5°F	68% (higher)median 80%	57% (higher)median 76%
HSPF2	46%median 8.7	65%median 9.8
SEER2	49%median 18.5	50%median 20.0
EER2	44%median 11.4	53%median 12.5
Heating capacity at 5°F	62% (higher)median 19,000 Btu/h	49% (higher)median 14,500 Btu/h
Outdoor models	26	27
AHRI certifications	42	47

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	HAXXAIR	HITACHI
CEE 2025 Tier 1 (Split ASHP)	65.4%17 models	74.1%20 models
CEE 2026 Tier 1 (Split ASHP)	65.4%17 models	74.1%20 models
CEE Advanced Tier (Split ASHP)	0%0 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	65.4%17 models	66.7%18 models
DOE Cold Climate Heat Pump Challenge	0%0 models	0%0 models
ENERGY STAR Cold Climate	57.7%15 models	14.8%4 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

HAXXAIR
HITACHI
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	HAXXAIR	HITACHI
Ducted, up to 1.5 tons	3 · index 49%	4 · index 50%
Ducted, 2 tons	3 · index 58%	2 · index 56%
Ducted, 2.5–3 tons	3 · index 70%	3 · index 71%
Ducted, 3.5–4.5 tons	3 · index 58%	3 · index 66%
Non-ducted, up to 1.5 tons	12 · index 55%	15 · index 57%
Non-ducted, 2 tons	5 · index 59%	5 · index 57%
Non-ducted, 2.5–3 tons	4 · index 61%	4 · index 52%
Non-ducted, 3.5–4.5 tons	1 · index 40%	2 · index 60%
Non-ducted, 5 tons and up	None	1 · index 69%

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	HAXXAIRCold-climate score, best model	HITACHICold-climate score, best model
Ducted, up to 1.5 tons	54.4(50 is the typical model of its size class)HVHSC-18T2Dwith ducted air handler HAHS-18T2D3 of 3 models qualify · AHRI 205921368	55.9(50 is the typical model of its size class) (higher)RAS-1.0PNNBDH1with ducted air handler RPIL-1.0PNN1DH2 of 4 models qualify · AHRI 206750852
Ducted, 2 tons	64.8(50 is the typical model of its size class)HVHSC-24T2Dwith ducted air handler HAHS-24T2D3 of 3 models qualify · AHRI 214855367	64.8(50 is the typical model of its size class)RAS-3.0PNNBDH1with ducted air handler RPIM-3.0PNN1DH1 of 2 models qualify · AHRI 206750858
Ducted, 2.5–3 tons	78.1(50 is the typical model of its size class)HVHSC-36T2Dwith ducted air handler HAHS-36T2D3 of 3 models qualify · AHRI 214855368	78.1(50 is the typical model of its size class)RAS-4.0PNNBDH1with ducted air handler RPIM-4.0PNN1DH2 of 3 models qualify · AHRI 206750860
Ducted, 3.5–4.5 tons	73.3(50 is the typical model of its size class)HVHD-48E2D2with ducted air handler DC61A44-245R2 of 3 models qualify · AHRI 214264495	None on this board (0 of 3 models qualify)
Non-ducted, up to 1.5 tons	73.0(50 is the typical model of its size class)HVHSC-18T2Dwith ductless indoor unit HAHC-18T2D7 of 12 models qualify · AHRI 205921367	81.1(50 is the typical model of its size class) (higher)RAC-SH09WHLAEwith ductless indoor unit RAS-SH09RHLAE13 of 15 models qualify · AHRI 206907172
Non-ducted, 2 tons	72.0(50 is the typical model of its size class)HVHSC-24T2Dwith ductless indoor unit HAH-24T2D4 of 5 models qualify · AHRI 214855369	76.3(50 is the typical model of its size class) (higher)RAC-PH24WHLAEwith ductless indoor unit RAS-PH24PHLAE3 of 5 models qualify · AHRI 207200483
Non-ducted, 2.5–3 tons	77.2(50 is the typical model of its size class)HVHSC-36T2Dwith ductless indoor unit HAH-36T2D2 of 4 models qualify · AHRI 214855370	77.2(50 is the typical model of its size class)RAS-4.0PNNBDH1with ductless indoor unit RCI-4.0PNN1DH3 of 4 models qualify · AHRI 206750859
Non-ducted, 3.5–4.5 tons	41.9(50 is the typical model of its size class)HVHM-42T2D1 of 1 models qualify · AHRI 212396481	None on this board (0 of 2 models qualify)
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	HAXXAIRAll-around score, best model	HITACHIAll-around score, best model
Ducted, up to 1.5 tons	50.7(50 is the typical model of its size class)HVHSC-18T2Dwith ducted air handler HAHS-18T2D3 of 3 models have all five ratings · AHRI 205921368	57.7(50 is the typical model of its size class) (higher)RAS-1.0PNNBDH1with ducted air handler RPIL-1.0PNN1DH3 of 4 models have all five ratings · AHRI 206750852
Ducted, 2 tons	71.6(50 is the typical model of its size class) (higher)HVHM-24T2D3 of 3 models have all five ratings · AHRI 204032224	55.8(50 is the typical model of its size class)RAS-3.0PNNBDH1with ducted air handler RPIM-3.0PNN1DH1 of 2 models have all five ratings · AHRI 206750858
Ducted, 2.5–3 tons	78.6(50 is the typical model of its size class) (higher)HVHM-36T2D3 of 3 models have all five ratings · AHRI 204032225	74.3(50 is the typical model of its size class)HVAHP036B21S*2 of 3 models have all five ratings · AHRI 203994975
Ducted, 3.5–4.5 tons	68.8(50 is the typical model of its size class)HVHD-48E2D2with ducted air handler DC61A44-245R3 of 3 models have all five ratings · AHRI 214264495	77.8(50 is the typical model of its size class) (higher)HVAHP048B21S*2 of 3 models have all five ratings · AHRI 203994976
Non-ducted, up to 1.5 tons	70.2(50 is the typical model of its size class)HVHSC-18T2Dwith ductless indoor unit HAH-18T2D8 of 12 models have all five ratings · AHRI 214855372	72.1(50 is the typical model of its size class) (higher)RAC-SH09WHLAEwith ductless indoor unit RAS-SH09RHLAE14 of 15 models have all five ratings · AHRI 206907172
Non-ducted, 2 tons	67.5(50 is the typical model of its size class)HVHM-24T2D4 of 5 models have all five ratings · AHRI 204198639	73.1(50 is the typical model of its size class) (higher)RAC-PH24WHLAEwith ductless indoor unit RAS-PH24PHLAE4 of 5 models have all five ratings · AHRI 207200483
Non-ducted, 2.5–3 tons	69.4(50 is the typical model of its size class)HVHM-36T2D2 of 4 models have all five ratings · AHRI 204100526	74.6(50 is the typical model of its size class) (higher)HVAHP036B21S*3 of 4 models have all five ratings · AHRI 203994969
Non-ducted, 3.5–4.5 tons	44.4(50 is the typical model of its size class)HVHM-42T2D1 of 1 models have all five ratings · AHRI 212510994	67.0(50 is the typical model of its size class) (higher)HVAHP048B21S*1 of 2 models have all five ratings · AHRI 203994970
Non-ducted, 5 tons and up	No models in this size class	68.5(50 is the typical model of its size class)HVAHP060B21S*1 of 1 models have all five ratings · AHRI 203994965

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	HAXXAIR	HITACHI
COP at 5°F	beats 96% · 2.28HVHSC-36T2DNon-ducted, 2.5–3 tons	beats 99% · 2.30RAC-EH24WHLAENon-ducted, 2 tons
Capacity retention at 5°F	beats 99% · 113%HVHM-36T2DNon-ducted, 2.5–3 tons	beats 99% · 133%RAC-PH09WHLAENon-ducted, up to 1.5 tons
HSPF2	beats 83% · 9.5HVHD-36E2D2Ducted, 2.5–3 tons	beats 98% · 10.0HVAHP048B21S*Ducted, 3.5–4.5 tons
SEER2	beats 96% · 21.0HVHM-24T2DDucted, 2 tons	beats 93% · 23.1HVAHP048B21S*Non-ducted, 3.5–4.5 tons
EER2	beats 84% · 12.5HVHM-36T2DNon-ducted, 2.5–3 tons	beats 100% · 16.7HVAHP048B21S*Non-ducted, 3.5–4.5 tons
Heating capacity at 5°F	beats 92% · 18,000 Btu/hHVHM-18T2DNon-ducted, up to 1.5 tons	beats 99% · 23,000 Btu/hRAC-PH18WHLAENon-ducted, up to 1.5 tons

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HAXXAIR vs HITACHI heat pumps