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.

Mitsutomo and THERMOCORE SYSTEMS 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, Mitsutomo scores higher on 5 of the 6 ratings.

Mitsutomo
THERMOCORE SYSTEMS
Other ranked manufacturers

Source: AHRI Directory, NEEP · as of Oct 9, 2026

Average peer percentile, raw median and rank among ranked manufacturers
Rating	Mitsutomo	THERMOCORE SYSTEMS
Efficiency index	59% (higher)median —	53% (higher)median —
COP at 5°F	48%median 1.95	51%median 1.92
Capacity retention at 5°F	72% (higher)median 88%	39% (higher)median 66%
HSPF2	72% (higher)median 9.5	56% (higher)median 9.1
SEER2	60% (higher)median 20.0	58% (higher)median 20.9
EER2	50% (higher)median 11.7	48% (higher)median 10.9
Heating capacity at 5°F	68% (higher)median 22,600 Btu/h	42% (higher)median 17,200 Btu/h
Outdoor models	31	32
AHRI certifications	71	52

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
Standard	Mitsutomo	THERMOCORE SYSTEMS
CEE 2025 Tier 1 (Split ASHP)	71%22 models	59.4%19 models
CEE 2026 Tier 1 (Split ASHP)	71%22 models	50%16 models
CEE Advanced Tier (Split ASHP)	3.2%1 models	0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)	67.7%21 models	37.5%12 models
DOE Cold Climate Heat Pump Challenge	3.2%1 models	0%0 models
ENERGY STAR Cold Climate	77.4%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

Mitsutomo
THERMOCORE SYSTEMS
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 9, 2026

Models per peer group · efficiency index within the group
Size and duct type	Mitsutomo	THERMOCORE SYSTEMS
Ducted, up to 1.5 tons	5 · index 65%	None
Ducted, 2 tons	2 · index 73%	1 · index 76%
Ducted, 2.5–3 tons	8 · index 66%	2 · index 35%
Ducted, 3.5–4.5 tons	6 · index 60%	2 · index 58%
Ducted, 5 tons and up	None	3 · index 51%
Non-ducted, up to 1.5 tons	10 · index 56%	13 · index 60%
Non-ducted, 2 tons	2 · index 47%	4 · index 59%
Non-ducted, 2.5–3 tons	9 · index 58%	7 · index 42%
Non-ducted, 3.5–4.5 tons	4 · index 51%	6 · index 45%

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	MitsutomoCold-climate score, best model	THERMOCORE SYSTEMSCold-climate score, best model
Ducted, up to 1.5 tons	74.9(50 is the typical model of its size class)HO-SZ09-AB-Qwith ducted air handler HD-UZ09-AB-Q5 of 5 models qualify · AHRI 214056566	No models in this size class
Ducted, 2 tons	79.4(50 is the typical model of its size class) (higher)HO-SZ24-AB-Qwith ducted air handler HD-UZ24-AB-Q2 of 2 models qualify · AHRI 214056569	57.3(50 is the typical model of its size class)T423D-H224-C1 of 1 models qualify · AHRI 209549027
Ducted, 2.5–3 tons	80.4(50 is the typical model of its size class)HO-MT28-AC-Q7 of 8 models qualify · AHRI 213785766	None on this board (0 of 2 models qualify)
Ducted, 3.5–4.5 tons	86.4(50 is the typical model of its size class)HO-SZ48-BB-Qwith ducted air handler HD-UZ48-BB-Q6 of 6 models qualify · AHRI 214056577	None on this board (0 of 2 models qualify)
Ducted, 5 tons and up	No models in this size class	None on this board (0 of 3 models qualify)
Non-ducted, up to 1.5 tons	82.4(50 is the typical model of its size class)HO-SZ06-AB-Qwith ductless indoor unit HJ-UZ06-AB-Q7 of 10 models qualify · AHRI 211306397	89.3(50 is the typical model of its size class) (higher)T5HH27S-H206-Cwith ductless indoor unit T5HH27S-H206-E8 of 13 models qualify · AHRI 209549006
Non-ducted, 2 tons	86.1(50 is the typical model of its size class) (higher)HO-SZ24-AB-Qwith ductless indoor unit HC-UZ24-AB-Q1 of 2 models qualify · AHRI 214056565	84.5(50 is the typical model of its size class)T5HH22S-H224-Cwith ductless indoor unit T5HH22S-H224-E2 of 4 models qualify · AHRI 209549010
Non-ducted, 2.5–3 tons	87.0(50 is the typical model of its size class)HO-MQ36-AC-Q6 of 9 models qualify · AHRI 213785768	None on this board (0 of 7 models qualify)
Non-ducted, 3.5–4.5 tons	80.5(50 is the typical model of its size class) (higher)HO-MP48-AB-Q4 of 4 models qualify · AHRI 211306410	56.3(50 is the typical model of its size class)T4C18S-H248-Cwith ductless indoor unit T3C18S-H248-ED2 of 6 models qualify · AHRI 209549023

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	MitsutomoAll-around score, best model	THERMOCORE SYSTEMSAll-around score, best model
Ducted, up to 1.5 tons	85.2(50 is the typical model of its size class)HO-SZ09-AB-Qwith ducted air handler HD-UZ09-AB-Q5 of 5 models have all five ratings · AHRI 214056566	No models in this size class
Ducted, 2 tons	80.1(50 is the typical model of its size class) (higher)HO-SZ24-AB-Qwith ducted air handler HD-UZ24-AB-Q2 of 2 models have all five ratings · AHRI 214056569	75.8(50 is the typical model of its size class)T423D-H224-C1 of 1 models have all five ratings · AHRI 209549027
Ducted, 2.5–3 tons	83.7(50 is the typical model of its size class) (higher)HO-MQ36-AC-Q8 of 8 models have all five ratings · AHRI 213785769	56.6(50 is the typical model of its size class)T424D-H236-C2 of 2 models have all five ratings · AHRI 209549030
Ducted, 3.5–4.5 tons	82.0(50 is the typical model of its size class) (higher)HO-MP48-AB-Q6 of 6 models have all five ratings · AHRI 211306411	63.5(50 is the typical model of its size class)T425D-H248-C2 of 2 models have all five ratings · AHRI 209549033
Ducted, 5 tons and up	No models in this size class	57.1(50 is the typical model of its size class)T4C18S-H260-C-2with ducted air handler T3C18S-H260-EDT3 of 3 models have all five ratings · AHRI 209549019
Non-ducted, up to 1.5 tons	84.4(50 is the typical model of its size class)HO-SZ09-AB-Qwith ductless indoor unit HW-SZ09-AB-Q10 of 10 models have all five ratings · AHRI 211306393	92.0(50 is the typical model of its size class) (higher)T5HH27S-H206-Cwith ductless indoor unit T5HH27S-H206-E13 of 13 models have all five ratings · AHRI 209549006
Non-ducted, 2 tons	70.7(50 is the typical model of its size class)HO-SZ24-AB-Qwith ductless indoor unit HW-SZ24-AB-Q2 of 2 models have all five ratings · AHRI 211306396	84.3(50 is the typical model of its size class) (higher)T5HH22S-H224-Cwith ductless indoor unit T5HH22S-H224-E4 of 4 models have all five ratings · AHRI 209549010
Non-ducted, 2.5–3 tons	76.8(50 is the typical model of its size class) (higher)HO-MQ36-AC-Q9 of 9 models have all five ratings · AHRI 213785768	60.2(50 is the typical model of its size class)T424D-H236-C5 of 7 models have all five ratings · AHRI 209549029
Non-ducted, 3.5–4.5 tons	73.8(50 is the typical model of its size class) (higher)HO-MP48-AB-Q4 of 4 models have all five ratings · AHRI 211306410	59.4(50 is the typical model of its size class)T425D-H248-C4 of 6 models have all five ratings · AHRI 209549032

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	Mitsutomo	THERMOCORE SYSTEMS
COP at 5°F	beats 87% · 2.01RO-SZ36-AB-QAlso listed as RO-SZ36-AC-QNon-ducted, 2.5–3 tons	beats 96% · 2.38T424S-H218-CNon-ducted, up to 1.5 tons
Capacity retention at 5°F	beats 96% · 101%HO-MT28-AC-QDucted, 2.5–3 tons	beats 92% · 107%T5HH27S-H206-CNon-ducted, up to 1.5 tons
HSPF2	beats 99% · 10.3HO-SZ48-BB-QDucted, 3.5–4.5 tons	beats 98% · 13.6T5HH27S-H206-CNon-ducted, up to 1.5 tons
SEER2	beats 99% · 20.9HO-MP48-AB-QDucted, 3.5–4.5 tons	beats 99% · 24.6T423D-H224-CNon-ducted, 2 tons
EER2	beats 95% · 15.8HO-SZ09-AB-QNon-ducted, up to 1.5 tons	beats 98% · 16.2T5HH28S-H209-CNon-ducted, up to 1.5 tons
Heating capacity at 5°F	beats 99% · 56,500 Btu/hHW-SZ60-BB-QNon-ducted, 3.5–4.5 tons	beats 92% · 18,000 Btu/hT5HH22S-H218-CNon-ducted, up to 1.5 tons

More comparisons

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Mitsutomo vs THERMOCORE SYSTEMS heat pumps