YISO heat pump efficiency: 7 outdoor models compared

YISO has 7 heat pump outdoor models certified with this refrigerant group, in 170 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.

New to heat pump ratings? The Simple view explains them in plain words →

ManufacturerData as of Oct 11, 2026updated Oct 11, 2026 · sources

Outdoor models: 7
AHRI certifications: 170
Efficiency index: 66%; Typical model vs same-size, same-type peers (7 models)
Meet CEE 2025: 100%; 7 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 80% of comparable models) and weakest on COP at 5°F (50%).

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 index7 models scored	66%	Not ranked	—
COP at 5°F7 models scored	50%	Not ranked	2.00
Capacity retention at 5°F7 models scored	52%	Not ranked	71%
HSPF27 models scored	75%	Not ranked	9.3
SEER27 models scored	80%	Not ranked	19.0
EER27 models scored	64%	Not ranked	11.2
Heating capacity at 5°F7 models scored	55%	Not ranked	33,600 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%	7
CEE 2026 Tier 1 (Split ASHP)	100%	7
CEE Advanced Tier (Split ASHP)	0%	0
Xcel Energy Colorado cold-climate ASHP (2025)	100%	7
DOE Cold Climate Heat Pump Challenge	0%	0
ENERGY STAR Cold Climate	100%	7

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	2	69%	58%	67%	77%
Ducted, 2.5–3 tons	1	54%	34%	74%	74%
Ducted, 3.5–4.5 tons	4	66%	51%	78%	83%

Every YISO model in the market

YISO’s 7 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 14,508 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: 7 yiso models, each through its representative certification, in the colour of the rating shown. The grey shapes count all 14,508 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	826	1.64	1.71	1.75	1.85	2.24
Ducted, 1 ton	407	1.80	1.90	2.05	2.41	2.45
Ducted, 1.5 tons	992	1.75	1.86	2.00	2.17	2.40
Ducted, 2 tons	999	1.75	1.86	2.00	2.18	2.30
Ducted, 2.5 tons	1,040	1.70	1.80	2.00	2.10	2.36
Ducted, 3 tons	696	1.80	1.90	2.00	2.10	2.42
Ducted, 3.5 tons	865	1.70	1.80	2.00	2.10	2.46
Ducted, 4 tons	726	1.80	1.86	2.00	2.12	2.41
Ducted, 4.5 tons	690	1.70	1.80	1.90	2.10	2.20
Ducted, 5 tons	86	1.89	2.00	2.10	2.10	2.10
Non-ducted, 0.5 tons	1,186	1.75	1.80	1.90	2.00	2.22
Non-ducted, 1 ton	1,343	1.80	1.80	1.99	2.10	2.21
Non-ducted, 1.5 tons	1,261	1.80	1.80	2.00	2.10	2.31
Non-ducted, 2 tons	761	1.80	1.98	2.00	2.10	2.30
Non-ducted, 2.5 tons	403	1.80	1.85	2.00	2.00	2.10
Non-ducted, 3 tons	473	1.90	1.98	2.00	2.03	2.20
Non-ducted, 3.5 tons	280	2.00	2.00	2.00	2.05	2.10
Non-ducted, 4 tons	204	1.96	2.00	2.05	2.10	2.11
Non-ducted, 4.5 tons	78	1.90	1.91	1.95	2.01	2.01
Non-ducted, 5 tons	84	1.99	2.00	2.05	2.20	2.20

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 5 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
1YOHA2-36CBYISO · Prowith ducted air handler YAHA2-24CB	2 tons24,000 Btu/h · Ducted	82%	2.10	10.0	19,600	20.0	CEE 25CEE 26XcelES CC	54	216445235	Ducted, 2 tons	71.1
2YOHA2-60CBYISO · Prowith ducted air handler YAHA2-36CB	3 tons35,200 Btu/h · Ducted	100%	1.90	10.0	35,200	19.0	CEE 25CEE 26XcelES CC	57	216620320	Ducted, 3.5–4.5 tons	69.4
3YOHA3-60DDYISO · Pro2with ducted air handler YAHA3-36DE	3 tons34,200 Btu/h · Ducted	100%	1.90	8.8	34,200	17.0	CEE 25CEE 26XcelES CC	31	218004202	Ducted, 3.5–4.5 tons	62.2
4YRHA1-60ABYISO · Pro2	4.5 tons56,000 Btu/h · Ducted	71%	1.90	9.5	39,500	19.0	CEE 25CEE 26XcelES CC	1	217463589	Ducted, 3.5–4.5 tons	56.7
5YOHA3-36DDYISO · Pro2with ducted air handler YAHA3-36DE	3 tons34,200 Btu/h · Ducted	70%	2.00	8.8	24,000	17.5	CEE 25CEE 26XcelES CC	25	218004201	Ducted, 2 tons	56.6

All-around best

Top 5 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
1YOHA2-36CBYISO · Prowith ducted air handler YAHA2-24CB	2 tons24,000 Btu/h · Ducted	82%	2.10	10.0	20.0	13.0	CEE 25CEE 26XcelES CC	54	216445235	Ducted, 2 tons	80.8	71.1	90.5	71.1
2YOHA2-60CBYISO · Prowith ducted air handler YAHA2-36CB	3 tons35,200 Btu/h · Ducted	100%	1.90	10.0	19.0	12.5	CEE 25CEE 26XcelES CC	57	216620320	Ducted, 3.5–4.5 tons	79.0	69.4	88.7	69.4
3YRHA1-60ABYISO · Pro2	4.5 tons56,000 Btu/h · Ducted	71%	1.90	9.5	19.0	11.2	CEE 25CEE 26XcelES CC	1	217463589	Ducted, 3.5–4.5 tons	63.7	56.7	70.8	56.7
4YRHA1-60BBYISO · Pro2	4.5 tons56,000 Btu/h · Ducted	71%	1.90	9.3	19.0	11.2	CEE 25CEE 26XcelES CC	1	218619207	Ducted, 3.5–4.5 tons	63.1	55.4	70.8	55.4
5YOHA3-60DDYISO · Pro2with ducted air handler YAHA3-48DE	4 tons46,000 Btu/h · Ducted	71%	2.00	8.8	17.5	11.2	CEE 25CEE 26XcelES CC	31	218004184	Ducted, 3.5–4.5 tons	60.7	57.9	63.4	62.2

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	YOHA2-60CB	2.10	Ducted, 3.5–4.5 tons	69%	216445237
Capacity retention at 5°F	YOHA2-60CB	100%	Ducted, 2.5–3 tons	85%	216620320
HSPF2	YOHA2-60CB	10.0	Ducted, 3.5–4.5 tons	86%	216445237
SEER2	YOHA2-36CB	20.0	Ducted, 2 tons	87%	216445235
EER2	YOHA2-60CB	12.5	Ducted, 2.5–3 tons	90%	216620320
Heating capacity at 5°F	YRHA1-60AB	39,500 Btu/h	Ducted, 3.5–4.5 tons	65%	217463589

All 7 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	71.1(50 is the typical model of its size class)YOHA2-36CBwith ducted air handler YAHA2-24CB1 of 1 models qualify · AHRI 216445235	80.8(50 is the typical model of its size class)YOHA2-36CBwith ducted air handler YAHA2-24CB2 of 2 models have all five ratings · AHRI 216445235
Ducted, 2.5–3 tons	69.4(50 is the typical model of its size class)YOHA2-60CBwith ducted air handler YAHA2-36CB4 of 4 models qualify · AHRI 216620320	79.0(50 is the typical model of its size class)YOHA2-60CBwith ducted air handler YAHA2-36CB2 of 2 models have all five ratings · AHRI 216620320
Ducted, 3.5–4.5 tons	56.7(50 is the typical model of its size class)YRHA1-60AB2 of 2 models qualify · AHRI 217463589	63.7(50 is the typical model of its size class)YRHA1-60AB3 of 3 models have all five ratings · AHRI 217463589

All-around board, every manufacturer

Newest YISO certifications

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

The 5 most recently certified YISO outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
YRHA1-36ADYISO · Pro2	3 tons35,000 Btu/h · Ducted	1.90	70%	9.2	18.3	CEE 25CEE 26XcelES CC	1	218619208
YRHA1-60BBYISO · Pro2	4.5 tons56,000 Btu/h · Ducted	1.90	71%	9.3	19.0	CEE 25CEE 26XcelES CC	1	218619207
YOHA3-60DDYISOwith indoor coil YCCN4-4860DB and furnace MGH96M100D5A	4.5 tons51,000 Btu/h · Ducted	1.85	68%	8.3	16.0	CEE 25CEE 26XcelES CC	31	218571802
YOHA3-36DDYISOwith indoor coil YLAN4-4860CB and furnace MGV96U080C4C	2.5 tons32,000 Btu/h · Ducted	1.90	63%	8.3	16.0	CEE 25CEE 26XcelES CC	25	218571801
YOHA2-60CBYISO · Pro2with ducted air handler YAHA3-60DEA	4.5 tons54,000 Btu/h · Ducted	1.90	70%	10.0	18.5	CEE 25CEE 26XcelES CC	57	218066933

Shares hardware with

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

Ecoer56 shared families

Compare YISO

Manufacturers of a similar size, side by side.

Compare with any manufacturer

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