Mitsutomo heat pump efficiency: 31 outdoor models compared

Mitsutomo has 31 heat pump outdoor models certified with this refrigerant group, in 71 AHRI-certified combinations. Each model is compared with models of the same size and duct type, so the scores below do not depend on which sizes Mitsutomo makes. Mitsutomo has no QMID (IRS Qualified Manufacturer ID) on file, so it is not ranked against other manufacturers.

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ManufacturerData as of Oct 9, 2026updated Oct 10, 2026 · sources

Outdoor models: 31
AHRI certifications: 71
Efficiency index: 59%; Typical model vs same-size, same-type peers (46 models)
Meet CEE 2025: 71%; 22 models

How Mitsutomo compares with comparable models

For each rating: the share of same-size, same-type models that a typical model of this manufacturer beats (50% is typical), its rank, and the raw median for context. Raw medians are not comparable across manufacturers that make different sizes.

Mitsutomo against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Mitsutomo’s own modelsMitsutomo is strongest on capacity retention at 5°F (its typical model beats 72% of comparable models) and weakest on COP at 5°F (48%).

Mitsutomo
Middle half of its models
Other ranked manufacturers

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

Average peer percentile of Mitsutomo’s models
Rating	Beats comparable models	Rank	Raw median
Efficiency index46 models scored	59%	Not ranked	—
COP at 5°F46 models scored	48%	Not ranked	1.95
Capacity retention at 5°F46 models scored	72%	Not ranked	88%
HSPF246 models scored	72%	Not ranked	9.5
SEER246 models scored	60%	Not ranked	20.0
EER246 models scored	50%	Not ranked	11.7
Heating capacity at 5°F46 models scored	68%	Not ranked	22,600 Btu/h

Standards met

Share of Mitsutomo’s models with at least one qualifying certification
Standard	Share	Models
CEE 2025 Tier 1 (Split ASHP)	71%	22
CEE 2026 Tier 1 (Split ASHP)	71%	22
CEE Advanced Tier (Split ASHP)	3.2%	1
Xcel Energy Colorado cold-climate ASHP (2025)	67.7%	21
DOE Cold Climate Heat Pump Challenge	3.2%	1
ENERGY STAR Cold Climate	77.4%	24

Sizes and duct types offered

Models per peer group, and how they score against the other models of that group.

Mitsutomo’s models inside each size and duct typeShape: every model of the group · blue: the middle half of this manufacturer’s models there, median dot, 10th–90th percentile line

Mitsutomo (median, middle 50%, 10th–90th)
All models of the group

Source: AHRI Directory · as of Oct 9, 2026

Share of comparable models beaten, per peer group
Size and duct type	Models	Index	COP@5°F	HSPF2	SEER2
Ducted, up to 1.5 tons	5	65%	40%	68%	70%
Ducted, 2 tons	2	73%	42%	90%	81%
Ducted, 2.5–3 tons	8	66%	41%	83%	76%
Ducted, 3.5–4.5 tons	6	60%	50%	87%	65%
Non-ducted, up to 1.5 tons	10	56%	51%	61%	56%
Non-ducted, 2 tons	2	47%	59%	64%	43%
Non-ducted, 2.5–3 tons	9	58%	55%	62%	50%
Non-ducted, 3.5–4.5 tons	4	51%	47%	77%	35%

Every Mitsutomo model in the market

Mitsutomo’s 46 models with a known size and duct type, over the shape of the whole catalog.

Mitsutomo models by size and ratingColoured: Mitsutomo · grey shapes: all 11,475 models · lines: catalog medians by size

Mitsutomo models
Ducted median by size
Non-ducted median by size
Every model at each size (width = count)
Standard threshold

Dots: 46 mitsutomo models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 11,475 models, half a ton at a time.

Show the data as a table

COP at 5°F by size and duct type (every model, by rated cooling capacity)
Duct type, size	Models	10th pct.	25th	Median	75th	90th
Ducted, 0.5 tons	175	1.70	1.85	1.90	2.10	2.26
Ducted, 1 ton	340	1.85	1.90	2.00	2.40	2.65
Ducted, 1.5 tons	789	1.75	1.85	2.00	2.20	2.55
Ducted, 2 tons	782	1.73	1.80	2.00	2.10	2.33
Ducted, 2.5 tons	735	1.71	1.80	1.90	2.09	2.48
Ducted, 3 tons	652	1.68	1.70	1.90	2.06	2.36
Ducted, 3.5 tons	641	1.61	1.80	1.95	2.20	2.50
Ducted, 4 tons	367	1.70	1.80	1.91	2.02	2.52
Ducted, 4.5 tons	544	1.70	1.80	1.91	2.08	2.34
Ducted, 5 tons	25	1.80	1.80	1.90	1.90	2.15
Non-ducted, 0.5 tons	717	1.75	1.81	1.97	2.10	2.19
Non-ducted, 1 ton	1,064	1.75	1.80	1.90	2.07	2.25
Non-ducted, 1.5 tons	886	1.80	1.80	1.87	2.07	2.21
Non-ducted, 2 tons	564	1.80	1.80	1.83	2.04	2.21
Non-ducted, 2.5 tons	275	1.80	1.81	1.84	1.86	2.03
Non-ducted, 3 tons	502	1.80	1.80	1.90	2.00	2.09
Non-ducted, 3.5 tons	70	1.82	1.83	1.90	2.00	2.28
Non-ducted, 4 tons	263	1.80	1.80	1.98	2.00	2.10
Non-ducted, 4.5 tons	103	1.77	1.77	1.80	1.97	2.02
Non-ducted, 5 tons	29	1.98	2.00	2.10	2.30	2.47

Source: AHRI Directory · as of Oct 9, 2026

Top Mitsutomo models

Its top five cold-climate picks and its top five all-around models across sizes (both scores compare each model with models of its own size and duct type, so sizes compare), then, on each single rating, the model that beats the largest share of comparable models.

Cold-climate picks

Top 5 Mitsutomo cold-climate picks across sizes. 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.
# · Outdoor model	Size · type	Cap. 5/47	COP@5°F	HSPF2	Btu/h @5°F	SEER2	Meets	Combos	AHRI ref.	Compared with	Score
1HO-MQ36-AC-QMitsutomo · HO Series	3 tons36,000 Btu/h · Non-ducted	100%	1.95	10.9	36,000	21.0	CEE 25CEE 26XcelES CC	3	213785768	Non-ducted, 2.5–3 tons	87.0
2HO-SZ48-BB-QMitsutomo · HO Serieswith ducted air handler HD-UZ48-BB-Q	4 tons48,000 Btu/h · Ducted	88%	2.02	10.3	46,000	14.3	None	3	214056577	Ducted, 3.5–4.5 tons	86.4
3HO-SZ24-AB-QMitsutomo · HO Serieswith ductless indoor unit HC-UZ24-AB-Q	2 tons24,000 Btu/h · Non-ducted	103%	2.00	11.5	25,800	20.5	CEE 25CEE 26CEE AdvXcelDOEES CC	5	214056565	Non-ducted, 2 tons	86.1
4HO-SZ06-AB-QMitsutomo · HO Serieswith ductless indoor unit HJ-UZ06-AB-Q	0.5 tons6,500 Btu/h · Non-ducted	113%	2.00	10.8	8,000	22.0	CEE 25CEE 26XcelES CC	2	211306397	Non-ducted, up to 1.5 tons	82.4
5HW-SZ60-BB-QMitsutomo · HW Serieswith ducted air handler HD-UZ60-BB-Q	4.5 tons55,000 Btu/h · Ducted	93%	1.97	9.5	53,000	15.8	ES CC	2	214056578	Ducted, 3.5–4.5 tons	82.0

All-around best

Top 5 Mitsutomo models on the all-around score across sizes. 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.
# · Outdoor model	Size · type	Cap. 5/47	COP@5°F	HSPF2	SEER2	EER2	Meets	Combos	AHRI ref.	Compared with	Score	Heating half	Cooling half	Cold-climate score
1HO-SZ09-AB-QMitsutomo · HO Serieswith ducted air handler HD-UZ09-AB-Q	1 ton9,000 Btu/h · Ducted	108%	1.90	12.0	20.2	13.2	CEE 25CEE 26XcelES CC	4	214056566	Ducted, up to 1.5 tons	85.2	74.9	95.5	74.9
2HO-SZ09-AB-QMitsutomo · HO Serieswith ductless indoor unit HW-SZ09-AB-Q	1 ton9,000 Btu/h · Non-ducted	94%	1.90	11.6	26.4	15.8	CEE 25CEE 26XcelES CC	4	211306393	Non-ducted, up to 1.5 tons	84.4	74.8	94.1	74.8
3HO-MQ36-AC-QMitsutomo · HO Series	3 tons36,000 Btu/h · Ducted	100%	1.90	10.0	19.4	12.0	CEE 25CEE 26XcelES CC	3	213785769	Ducted, 2.5–3 tons	83.7	79.9	87.5	79.9
4HO-MP48-AB-QMitsutomo · HO Series	4 tons47,000 Btu/h · Ducted	87%	2.00	9.0	20.9	11.7	CEE 25CEE 26XcelES CC	3	211306411	Ducted, 3.5–4.5 tons	82.0	74.9	89.1	74.9
5HO-MT28-AC-QMitsutomo · HO Series	2.5 tons27,000 Btu/h · Ducted	101%	1.90	10.0	19.0	11.8	CEE 25CEE 26XcelES CC	3	213785766	Ducted, 2.5–3 tons	81.9	80.4	83.3	80.4

Best model on each rating

Mitsutomo’s model with the highest peer percentile on each rating, ranked by that one rating only
Rating	Model	Value	Compared with	Beats	AHRI ref.
COP at 5°F	RO-SZ36-AB-QAlso listed as RO-SZ36-AC-Q	2.01	Non-ducted, 2.5–3 tons	87%	213785763
Capacity retention at 5°F	HO-MT28-AC-Q	101%	Ducted, 2.5–3 tons	96%	213785766
HSPF2	HO-SZ48-BB-Q	10.3	Ducted, 3.5–4.5 tons	99%	214056577
SEER2	HO-MP48-AB-Q	20.9	Ducted, 3.5–4.5 tons	99%	211306411
EER2	HO-SZ09-AB-Q	15.8	Non-ducted, up to 1.5 tons	95%	211306393
Heating capacity at 5°F	HW-SZ60-BB-Q	56,500 Btu/h	Non-ducted, 3.5–4.5 tons	99%	214056581

All 31 Mitsutomo models in Explore

Mitsutomo size class by size class: cold-climate and all-around

Its best model on each board in every size and duct type it makes. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there). Cold-climate picks must keep at least 70% of their heat at 5°F; the all-around score needs all five ratings and has no such bar.

Mitsutomo: best cold-climate pick and best all-around model per size and duct type, with how many of its models are on each board (top 5 and 5 per class are in the snapshot)
Size and duct type	Cold-climate pickCold-climate score, best model	All-around bestAll-around 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	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
Ducted, 2 tons	79.4(50 is the typical model of its size class)HO-SZ24-AB-Qwith ducted air handler HD-UZ24-AB-Q2 of 2 models qualify · AHRI 214056569	80.1(50 is the typical model of its size class)HO-SZ24-AB-Qwith ducted air handler HD-UZ24-AB-Q2 of 2 models have all five ratings · AHRI 214056569
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	83.7(50 is the typical model of its size class)HO-MQ36-AC-Q8 of 8 models have all five ratings · AHRI 213785769
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	82.0(50 is the typical model of its size class)HO-MP48-AB-Q6 of 6 models have all five ratings · AHRI 211306411
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	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
Non-ducted, 2 tons	86.1(50 is the typical model of its size class)HO-SZ24-AB-Qwith ductless indoor unit HC-UZ24-AB-Q1 of 2 models qualify · AHRI 214056565	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
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	76.8(50 is the typical model of its size class)HO-MQ36-AC-Q9 of 9 models have all five ratings · AHRI 213785768
Non-ducted, 3.5–4.5 tons	80.5(50 is the typical model of its size class)HO-MP48-AB-Q4 of 4 models qualify · AHRI 211306410	73.8(50 is the typical model of its size class)HO-MP48-AB-Q4 of 4 models have all five ratings · AHRI 211306410

All-around board, every manufacturer

Newest Mitsutomo certifications

By AHRI reference number; AHRI issues references in increasing order.

The 5 most recently certified Mitsutomo outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
RO-SZ36-AC-QMitsutomowith ductless indoor unit RW-SZ36-AC-Q	3 tons36,000 Btu/h · Non-ducted	2.01	61%	7.8	18.0	None	1	214797739
RO-SZ30-AB-QMitsutomo · RO Serieswith ducted air handler HV-UZ30-AB-Q	2.5 tons30,000 Btu/h · Ducted and non-ducted	1.81	63%	8.4	17.5	CEE 25CEE 26	3	214056584
HO-SZ24-AB-QMitsutomo · HO Serieswith ducted air handler HV-UZ24-AB-Q	2 tons23,000 Btu/h · Ducted and non-ducted	1.90	82%	9.3	18.4	CEE 25CEE 26CEE AdvXcelDOEES CC	5	214056583
HO-SZ18-AB-QMitsutomo · HO Serieswith ducted air handler HV-UZ18-AB-Q	1.5 tons18,000 Btu/h · Ducted and non-ducted	2.00	89%	9.6	17.6	CEE 25CEE 26XcelES CC	7	214056582
HW-SZ60-BB-QMitsutomo · HW Serieswith ductless indoor unit HF-UZ60-BB-Q	4.5 tons55,000 Btu/h · Ducted and non-ducted	1.97	94%	10.2	17.3	XcelES CC	2	214056581

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Mitsutomo includes these brand names as listed in AHRI: Mitsutomo. Standards are checked against published thresholds; program rules beyond ratings are not checked.