YISO heat pump efficiency: 4 outdoor models compared

YISO has 4 heat pump outdoor models certified with this refrigerant group, in 74 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 YISO makes. YISO 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 11, 2026updated Oct 11, 2026 · sources

Outdoor models: 4
AHRI certifications: 74
Efficiency index: 75%; Typical model vs same-size, same-type peers (4 models)
Meet CEE 2025: 100%; 4 models

How YISO 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.

YISO against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of YISO’s own modelsYISO is strongest on SEER2 (its typical model beats 90% of comparable models) and weakest on COP at 5°F (60%).

YISO
Middle half of its models
Other ranked manufacturers

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

Average peer percentile of YISO’s models
Rating	Beats comparable models	Rank	Raw median
Efficiency index4 models scored	75%	Not ranked	—
COP at 5°F4 models scored	60%	Not ranked	2.03
Capacity retention at 5°F4 models scored	65%	Not ranked	71%
HSPF24 models scored	79%	Not ranked	9.4
SEER24 models scored	90%	Not ranked	19.0
EER24 models scored	75%	Not ranked	11.9
Heating capacity at 5°F4 models scored	64%	Not ranked	29,800 Btu/h

Standards met

Share of YISO’s models with at least one qualifying certification
Standard	Share	Models
CEE 2025 Tier 1 (Split ASHP)	100%	4
CEE 2026 Tier 1 (Split ASHP)	100%	4
CEE Advanced Tier (Split ASHP)	0%	0
Xcel Energy Colorado cold-climate ASHP (2025)	100%	4
DOE Cold Climate Heat Pump Challenge	0%	0
ENERGY STAR Cold Climate	100%	4

Sizes and duct types offered

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

YISO’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

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

Source: AHRI Directory · as of Oct 11, 2026

Share of comparable models beaten, per peer group
Size and duct type	Models	Index	COP@5°F	HSPF2	SEER2
Ducted, 2 tons	1	84%	67%	77%	96%
Ducted, 2.5–3 tons	1	61%	58%	69%	84%
Ducted, 3.5–4.5 tons	2	78%	58%	85%	89%

Every YISO model in the market

YISO’s 4 models with a known size and duct type, over the shape of the whole catalog.

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

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

Dots: 4 yiso 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 11, 2026

Top YISO 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 4 YISO 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
1YOHA2-60AAYISO · Prowith ducted air handler YAHA1-48BA	4 tons47,000 Btu/h · Ducted	72%	2.10	9.5	34,400	19.0	CEE 25CEE 26XcelES CC	34	214290128	Ducted, 3.5–4.5 tons	78.6
2YOHA2-36AAYISO · Prowith ducted air handler YAHA1-24BA	2 tons24,000 Btu/h · Ducted	82%	2.10	9.5	19,600	20.5	CEE 25CEE 26XcelES CC	35	214290126	Ducted, 2 tons	71.4
3YOHA8-36AYISO · Ultrawith ducted air handler YAHA2-36AA	3 tons33,600 Btu/h · Ducted	70%	1.95	9.0	24,600	17.2	CEE 25CEE 26XcelES CC	4	215722678	Ducted, 2.5–3 tons	61.1
4YRHA1-60AAYISO · Pro	4.5 tons55,000 Btu/h · Ducted	70%	1.90	9.2	38,500	18.5	CEE 25CEE 26XcelES CC	1	214728307	Ducted, 3.5–4.5 tons	61.1

All-around best

Top 4 YISO 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
1YOHA2-60AAYISO · Prowith ducted air handler YAHA1-48BA	4 tons47,000 Btu/h · Ducted	72%	2.10	9.5	19.0	12.5	CEE 25CEE 26XcelES CC	34	214290128	Ducted, 3.5–4.5 tons	86.4	78.6	94.2	78.6
2YOHA2-36AAYISO · Prowith ducted air handler YAHA1-24BA	2 tons24,000 Btu/h · Ducted	82%	2.10	9.5	20.5	13.0	CEE 25CEE 26XcelES CC	35	214290126	Ducted, 2 tons	84.1	71.4	96.8	71.4
3YRHA1-60AAYISO · Pro	4.5 tons55,000 Btu/h · Ducted	70%	1.90	9.2	18.5	11.2	CEE 25CEE 26XcelES CC	1	214728307	Ducted, 3.5–4.5 tons	68.8	61.1	76.5	61.1
4YOHA8-36AYISO · Ultrawith ducted air handler YAHA2-24AA	2 tons23,000 Btu/h · Ducted	83%	1.90	8.8	18.5	11.7	CEE 25CEE 26XcelES CC	4	215722677	Ducted, 2.5–3 tons	62.1	54.4	69.8	61.1

Best model on each rating

YISO’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	YOHA2-60AA	2.10	Ducted, 3.5–4.5 tons	75%	214290128
Capacity retention at 5°F	YOHA2-60AA	83%	Ducted, 2.5–3 tons	72%	216019256
HSPF2	YOHA2-60AA	9.5	Ducted, 3.5–4.5 tons	92%	214290128
SEER2	YOHA2-36AA	20.5	Ducted, 2 tons	95%	214290126
EER2	YOHA2-36AA	13.0	Ducted, 2 tons	95%	214290126
Heating capacity at 5°F	YOHA2-60AA	38,500 Btu/h	Ducted, 3.5–4.5 tons	70%	214290129

All 4 YISO models in Explore

YISO 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.

YISO: 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, 2 tons	71.4(50 is the typical model of its size class)YOHA2-36AAwith ducted air handler YAHA1-24BA1 of 1 models qualify · AHRI 214290126	84.1(50 is the typical model of its size class)YOHA2-36AAwith ducted air handler YAHA1-24BA2 of 2 models have all five ratings · AHRI 214290126
Ducted, 2.5–3 tons	61.1(50 is the typical model of its size class)YOHA8-36Awith ducted air handler YAHA2-36AA1 of 1 models qualify · AHRI 215722678	No models in this size class
Ducted, 3.5–4.5 tons	78.6(50 is the typical model of its size class)YOHA2-60AAwith ducted air handler YAHA1-48BA2 of 2 models qualify · AHRI 214290128	86.4(50 is the typical model of its size class)YOHA2-60AAwith ducted air handler YAHA1-48BA2 of 2 models have all five ratings · AHRI 214290128

All-around board, every manufacturer

Newest YISO certifications

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

The 4 most recently certified YISO outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
YOHA2-36AAYISO · Prowith ducted air handler YLSN2-3036CA	2.5 tons29,000 Btu/h · Ducted	1.90	70%	9.0	16.0	CEE 25CEE 26XcelES CC	35	217477686
YOHA2-60AAYISO · Prowith indoor coil YLSN2-3036CA and furnace MGH96M080C4A	3 tons33,000 Btu/h · Ducted	1.95	80%	9.0	18.0	CEE 25CEE 26XcelES CC	34	217477683
YOHA8-36AYISO · Ultrawith ducted air handler YAHA2-36CB	3 tons34,200 Btu/h · Ducted	1.95	70%	9.0	19.0	CEE 25CEE 26XcelES CC	4	217269576
YRHA1-60AAYISO · Pro	4.5 tons55,000 Btu/h · Ducted	1.90	70%	9.2	18.5	CEE 25CEE 26XcelES CC	1	214728307

Shares hardware with

Manufacturers whose models are the same equipment under another badge. About OEM families

No shared hardware found for YISO in this group.

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Manufacturers of a similar size, side by side.

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