Viessmann heat pump efficiency: 43 outdoor models compared

Viessmann has 43 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 Viessmann makes. Viessmann 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: 43
AHRI certifications: 170
Efficiency index: 60%; Typical model vs same-size, same-type peers (59 models)
Meet CEE 2025: 83.7%; 36 models

How Viessmann 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.

Viessmann against every ranked manufacturerPeer scores, 0–100 · grey ticks: each ranked manufacturer · shaded: the middle half of Viessmann’s own modelsViessmann is strongest on heating capacity at 5°F (its typical model beats 74% of comparable models) and weakest on EER2 (49%).

Viessmann
Middle half of its models
Other ranked manufacturers

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

Average peer percentile of Viessmann’s models
Rating	Beats comparable models	Rank	Raw median
Efficiency index59 models scored	60%	Not ranked	—
COP at 5°F59 models scored	53%	Not ranked	2.00
Capacity retention at 5°F59 models scored	72%	Not ranked	88%
HSPF259 models scored	74%	Not ranked	9.5
SEER259 models scored	59%	Not ranked	17.0
EER259 models scored	49%	Not ranked	11.0
Heating capacity at 5°F59 models scored	74%	Not ranked	25,000 Btu/h

Standards met

Share of Viessmann’s models with at least one qualifying certification
Standard	Share	Models
CEE 2025 Tier 1 (Split ASHP)	83.7%	36
CEE 2026 Tier 1 (Split ASHP)	83.7%	36
CEE Advanced Tier (Split ASHP)	4.7%	2
Xcel Energy Colorado cold-climate ASHP (2025)	79.1%	34
DOE Cold Climate Heat Pump Challenge	4.7%	2
ENERGY STAR Cold Climate	69.8%	30

Sizes and duct types offered

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

Viessmann’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

Viessmann (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	8	67%	62%	68%	70%
Ducted, 2 tons	7	59%	55%	74%	57%
Ducted, 2.5–3 tons	16	55%	53%	71%	56%
Ducted, 3.5–4.5 tons	11	57%	44%	72%	59%
Non-ducted, up to 1.5 tons	5	77%	60%	85%	71%
Non-ducted, 2 tons	2	79%	72%	84%	75%
Non-ducted, 2.5–3 tons	6	57%	52%	67%	49%
Non-ducted, 3.5–4.5 tons	4	52%	33%	87%	42%

Every Viessmann model in the market

Viessmann’s 59 models with a known size and duct type, over the shape of the whole catalog.

Viessmann models by size and ratingColoured: Viessmann · grey shapes: all 14,508 models · lines: catalog medians by size

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

Dots: 59 viessmann 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	864	1.70	1.80	2.00	2.10	2.46
Ducted, 4 tons	727	1.80	1.86	2.00	2.12	2.40
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 9, 2026

Top Viessmann 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 Viessmann 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
1D5CSHAH06AAKViessmann · D5C Serieswith ductless indoor unit D5FSHAH06XAK	0.5 tons6,000 Btu/h · Non-ducted	110%	2.40	14.8	7,700	25.7	CEE 25CEE 26CEE AdvXcelDOEES CC	2	217178781	Non-ducted, up to 1.5 tons	96.7
2D5CLHAH36AAKViessmann · D5C Serieswith ductless indoor unit D5FCFAH36XAK	3 tons36,400 Btu/h · Non-ducted	104%	2.02	10.8	39,500	20.2	CEE 25CEE 26XcelES CC	4	217178810	Non-ducted, 2.5–3 tons	89.4
3D5CSHAH24AAKViessmann · D5C Serieswith ductless indoor unit D5FSCAH24XAK	2 tons23,400 Btu/h · Non-ducted	95%	2.23	11.6	23,800	20.8	CEE 25CEE 26XcelES CC	5	217178803	Non-ducted, 2 tons	89.4
4D5CUHAH18AAKViessmann · D5C Serieswith ducted air handler D5MUWAQ18XA3	1.5 tons18,000 Btu/h · Ducted	103%	2.10	10.8	19,600	19.3	CEE 25CEE 26CEE AdvXcelDOEES CC	5	218668521	Ducted, up to 1.5 tons	86.7
5D5CSHAH24AAKViessmann · D5C Serieswith ducted air handler D5FSDAH24XHK	2 tons24,000 Btu/h · Ducted	92%	2.18	11.7	24,000	19.2	CEE 25CEE 26XcelES CC	5	217178805	Ducted, 2 tons	85.7

All-around best

Top 5 Viessmann 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
1D5CSHAH06AAKViessmann · D5C Serieswith ductless indoor unit D5FSHAH06XAK	0.5 tons6,000 Btu/h · Non-ducted	110%	2.40	14.8	25.7	18.0	CEE 25CEE 26CEE AdvXcelDOEES CC	2	217178781	Non-ducted, up to 1.5 tons	96.5	96.7	96.3	96.7
2D5CSHAH09AAKViessmann · D5C Serieswith ducted air handler D5FSDAH12XAK	1 ton9,000 Btu/h · Ducted	112%	1.89	12.5	21.5	13.5	CEE 25CEE 26XcelES CC	6	217178787	Ducted, up to 1.5 tons	87.4	80.0	94.9	80.0
3D5CMHAH30EAKViessmann · D5C Series	2.5 tons30,000 Btu/h · Non-ducted	116%	2.00	10.7	24.0	13.2	CEE 25CEE 26XcelES CC	3	217178823	Non-ducted, 2.5–3 tons	85.8	80.9	90.6	80.9
4D5CMHAH30EAKViessmann · D5C Series	2.5 tons30,000 Btu/h · Ducted	116%	1.95	10.5	19.5	12.5	CEE 25CEE 26XcelES CC	3	217178824	Ducted, 2.5–3 tons	85.5	78.5	92.5	78.5
5D5CMHAH36EAKViessmann · D5C Series	3 tons36,000 Btu/h · Ducted	106%	2.00	10.5	19.5	12.0	CEE 25CEE 26XcelES CC	3	217178827	Ducted, 2.5–3 tons	84.6	83.2	85.9	83.2

Best model on each rating

Viessmann’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	D5CSHAH06AAK	2.40	Non-ducted, up to 1.5 tons	97%	217178781
Capacity retention at 5°F	D5CMHAH30EAK	116%	Non-ducted, 2.5–3 tons	100%	217178823
HSPF2	D5CSHAH06AAK	14.8	Non-ducted, up to 1.5 tons	99%	217178781
SEER2	D5CMHAH48FAK	20.5	Ducted, 3.5–4.5 tons	99%	217178830
EER2	D5CSHAH06AAK	18.0	Non-ducted, up to 1.5 tons	99%	217178781
Heating capacity at 5°F	D5CUHAH18AAK	19,600 Btu/h	Ducted, up to 1.5 tons	98%	218668521

All 43 Viessmann models in Explore

Viessmann 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.

Viessmann: 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	86.7(50 is the typical model of its size class)D5CUHAH18AAKwith ducted air handler D5MUWAQ18XA37 of 8 models qualify · AHRI 218668521	87.4(50 is the typical model of its size class)D5CSHAH09AAKwith ducted air handler D5FSDAH12XAK8 of 8 models have all five ratings · AHRI 217178787
Ducted, 2 tons	85.7(50 is the typical model of its size class)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK7 of 7 models qualify · AHRI 217178805	80.0(50 is the typical model of its size class)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK7 of 7 models have all five ratings · AHRI 217178805
Ducted, 2.5–3 tons	83.2(50 is the typical model of its size class)D5CMHAH36EAK11 of 16 models qualify · AHRI 217178827	85.5(50 is the typical model of its size class)D5CMHAH30EAK16 of 16 models have all five ratings · AHRI 217178824
Ducted, 3.5–4.5 tons	82.7(50 is the typical model of its size class)D5CMHAH48FAK10 of 11 models qualify · AHRI 217178830	84.6(50 is the typical model of its size class)D5CMHAH48FAK11 of 11 models have all five ratings · AHRI 217178830
Non-ducted, up to 1.5 tons	96.7(50 is the typical model of its size class)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK5 of 5 models qualify · AHRI 217178781	96.5(50 is the typical model of its size class)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK5 of 5 models have all five ratings · AHRI 217178781
Non-ducted, 2 tons	89.4(50 is the typical model of its size class)D5CSHAH24AAKwith ductless indoor unit D5FSCAH24XAK2 of 2 models qualify · AHRI 217178803	78.7(50 is the typical model of its size class)D5CSHAH24AAKwith ductless indoor unit D5FSHAH24XAK2 of 2 models have all five ratings · AHRI 217178802
Non-ducted, 2.5–3 tons	89.4(50 is the typical model of its size class)D5CLHAH36AAKwith ductless indoor unit D5FCFAH36XAK4 of 6 models qualify · AHRI 217178810	85.8(50 is the typical model of its size class)D5CMHAH30EAK6 of 6 models have all five ratings · AHRI 217178823
Non-ducted, 3.5–4.5 tons	75.5(50 is the typical model of its size class)D5CMHAH48FAK4 of 4 models qualify · AHRI 217178831	76.7(50 is the typical model of its size class)D5CMHAH48FAK4 of 4 models have all five ratings · AHRI 217178829

All-around board, every manufacturer

Newest Viessmann certifications

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

The 5 most recently certified Viessmann outdoor models
Outdoor model	Size · type	COP@5°F	Cap. 5/47	HSPF2	SEER2	Meets	Combos	AHRI ref.
D5CUHAH60AAKViessmann · D5C Serieswith ducted air handler D5FULBH60XDX	4 tons47,000 Btu/h · Ducted	1.83	74%	8.1	15.2	CEE 25CEE 26XcelES CC	6	218792527
D5CUHAH36AAKViessmann · D5C Serieswith ducted air handler D5FULBH36XBX	3 tons36,000 Btu/h · Ducted	1.90	95%	9.4	15.8	CEE 25CEE 26XcelES CC	9	218792525
D5CUHAH24AAKViessmann · D5C Serieswith ducted air handler D5FULBH24XAX	2 tons24,000 Btu/h · Ducted	1.80	84%	9.5	16.0	CEE 25CEE 26XcelES CC	7	218792522
D5CURAH60AAKViessmannwith ducted air handler D5FULBH60XDX	4 tons50,000 Btu/h · Ducted	1.80	78%	8.2	14.3	ES CC	6	218792520
D5CURAH36AAKViessmann · D5C Serieswith ducted air handler D5FULBH36XBX	3 tons36,000 Btu/h · Ducted	2.00	76%	8.5	14.7	CEE 25CEE 26XcelES CC	10	218792518

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