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TGM vs Viessmann heat pumps

Measured against models of the same size and duct type, Viessmann scores higher on 6 of the 6 ratings. TGM has 77 outdoor models, Viessmann has 43 outdoor models. TGM and Viessmann have no QMID on file and are not ranked.

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CompareData as of updated · sources

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.
TGM and Viessmann 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, Viessmann scores higher on 6 of the 6 ratings.
  • TGM
  • Viessmann
  • Other ranked manufacturers
TGMViessmann

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingTGMViessmann
Efficiency index45%median —60%median —
COP at 5°F48%median 1.9153%median 2.00
Capacity retention at 5°F42%median 71%72%median 88%
HSPF241%median 8.674%median 9.5
SEER245%median 19.059%median 17.0
EER242%median 11.249%median 11.0
Heating capacity at 5°F47%median 14,100 Btu/h74%median 25,000 Btu/h
Outdoor models7743
AHRI certifications152170

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardTGMViessmann
CEE 2025 Tier 1 (Split ASHP)58.4%45 models83.7%36 models
CEE 2026 Tier 1 (Split ASHP)57.1%44 models83.7%36 models
CEE Advanced Tier (Split ASHP)1.3%1 models4.7%2 models
Xcel Energy Colorado cold-climate ASHP (2025)54.5%42 models79.1%34 models
DOE Cold Climate Heat Pump Challenge1.3%1 models4.7%2 models
ENERGY STAR Cold Climate20.8%16 models69.8%30 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 · 8 groups where both have models
  • TGM
  • Viessmann
  • All models of the group
Ducted, up to 1.5 tons1.901,783 modelsDucted, 2 tons2.001,090 modelsDucted, 2.5–3 tons2.001,909 modelsDucted, 3.5–4.5 tons2.002,224 modelsDucted, 5 tons and up2.00321 modelsNon-ducted, up to 1.5 tons1.953,455 modelsNon-ducted, 2 tons2.00863 modelsNon-ducted, 2.5–3 tons2.001,106 modelsNon-ducted, 3.5–4.5 tons2.00564 modelsmedian

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typeTGMViessmann
Ducted, up to 1.5 tons5 · index 62%8 · index 67%
Ducted, 2 tons8 · index 67%7 · index 59%
Ducted, 2.5–3 tons10 · index 50%16 · index 55%
Ducted, 3.5–4.5 tons11 · index 61%11 · index 57%
Ducted, 5 tons and up2 · index 69%None
Non-ducted, up to 1.5 tons32 · index 34%5 · index 77%
Non-ducted, 2 tons9 · index 43%2 · index 79%
Non-ducted, 2.5–3 tons8 · index 40%6 · index 57%
Non-ducted, 3.5–4.5 tons5 · index 43%4 · index 52%

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 typeTGMCold-climate score, best modelViessmannCold-climate score, best model
Ducted, up to 1.5 tons69.8(50 is the typical model of its size class)MRS5VHT18ASwith ducted air handler MFC5VHT18S3 of 5 models qualify · AHRI 21727461386.7(50 is the typical model of its size class) (higher)D5CUHAH18AAKwith ducted air handler D5MUWAQ18XA37 of 8 models qualify · AHRI 218668521
Ducted, 2 tons77.1(50 is the typical model of its size class)MRS5VHT24ASwith ducted air handler MFC5VHT24S6 of 8 models qualify · AHRI 21727461585.7(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK7 of 7 models qualify · AHRI 217178805
Ducted, 2.5–3 tons63.6(50 is the typical model of its size class)MTVC2OCN036Awith ducted air handler MTA20C036A3 of 10 models qualify · AHRI 21804424783.2(50 is the typical model of its size class) (higher)D5CMHAH36EAK11 of 16 models qualify · AHRI 217178827
Ducted, 3.5–4.5 tons72.2(50 is the typical model of its size class)OTV18HN048Awith ducted air handler OTA18C006AAlso listed as OTV18HN060A7 of 11 models qualify · AHRI 21774707282.7(50 is the typical model of its size class) (higher)D5CMHAH48FAK10 of 11 models qualify · AHRI 217178830
Ducted, 5 tons and up64.1(50 is the typical model of its size class)MRB560HWD1 of 2 models qualify · AHRI 217194656No models in this size class
Non-ducted, up to 1.5 tons79.2(50 is the typical model of its size class)ARHHBT18ASwith ductless indoor unit AWHHBT18S22 of 32 models qualify · AHRI 21862080796.7(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK5 of 5 models qualify · AHRI 217178781
Non-ducted, 2 tons77.9(50 is the typical model of its size class)MRS5VHT24ASwith ductless indoor unit MUV5HT24S6 of 9 models qualify · AHRI 21670603989.4(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ductless indoor unit D5FSCAH24XAK2 of 2 models qualify · AHRI 217178803
Non-ducted, 2.5–3 tons77.2(50 is the typical model of its size class)GMRSHT36AS46 of 8 models qualify · AHRI 21728481389.4(50 is the typical model of its size class) (higher)D5CLHAH36AAKwith ductless indoor unit D5FCFAH36XAK4 of 6 models qualify · AHRI 217178810
Non-ducted, 3.5–4.5 tons66.5(50 is the typical model of its size class)GMRSHT42AS53 of 5 models qualify · AHRI 21728481475.5(50 is the typical model of its size class) (higher)D5CMHAH48FAK4 of 4 models qualify · AHRI 217178831

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 typeTGMAll-around score, best modelViessmannAll-around score, best model
Ducted, up to 1.5 tons78.4(50 is the typical model of its size class)MRS5VHT18ASwith ducted air handler MFC5VHT18S3 of 5 models have all five ratings · AHRI 21727461387.4(50 is the typical model of its size class) (higher)D5CSHAH09AAKwith ducted air handler D5FSDAH12XAK8 of 8 models have all five ratings · AHRI 217178787
Ducted, 2 tons79.6(50 is the typical model of its size class)CTV520HN036Awith ducted air handler CTA520C024A6 of 8 models have all five ratings · AHRI 21713812180.0(50 is the typical model of its size class) (higher)D5CSHAH24AAKwith ducted air handler D5FSDAH24XHK7 of 7 models have all five ratings · AHRI 217178805
Ducted, 2.5–3 tons72.8(50 is the typical model of its size class)MTVC2OCN036Awith ducted air handler MTA20C036A6 of 10 models have all five ratings · AHRI 21804424785.5(50 is the typical model of its size class) (higher)D5CMHAH30EAK16 of 16 models have all five ratings · AHRI 217178824
Ducted, 3.5–4.5 tons72.6(50 is the typical model of its size class)OTV18HN048Awith ducted air handler OTA18C006AAlso listed as OTV18HN060A8 of 11 models have all five ratings · AHRI 21774707284.6(50 is the typical model of its size class) (higher)D5CMHAH48FAK11 of 11 models have all five ratings · AHRI 217178830
Ducted, 5 tons and up70.5(50 is the typical model of its size class)MRB560HWD2 of 2 models have all five ratings · AHRI 217194656No models in this size class
Non-ducted, up to 1.5 tons82.9(50 is the typical model of its size class)ARHHBT18ASwith ductless indoor unit AWHHBT18S32 of 32 models have all five ratings · AHRI 21862080796.5(50 is the typical model of its size class) (higher)D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAK5 of 5 models have all five ratings · AHRI 217178781
Non-ducted, 2 tons86.5(50 is the typical model of its size class) (higher)ARHHBT24ASwith ductless indoor unit AWHHBT24S9 of 9 models have all five ratings · AHRI 21862080878.7(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 tons64.5(50 is the typical model of its size class)GMRSHT36AS47 of 8 models have all five ratings · AHRI 21728481385.8(50 is the typical model of its size class) (higher)D5CMHAH30EAK6 of 6 models have all five ratings · AHRI 217178823
Non-ducted, 3.5–4.5 tons67.7(50 is the typical model of its size class)GMRSHT42AS54 of 5 models have all five ratings · AHRI 21728481476.7(50 is the typical model of its size class) (higher)D5CMHAH48FAK4 of 4 models have all five ratings · AHRI 217178829

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
RatingTGMViessmann
COP at 5°Fbeats 98% · 2.50ARHCPT18ASNon-ducted, up to 1.5 tonsbeats 97% · 2.40D5CSHAH06AAKNon-ducted, up to 1.5 tons
Capacity retention at 5°Fbeats 88% · 70%MRB560HWDDucted, 5 tons and upbeats 100% · 116%D5CMHAH30EAKNon-ducted, 2.5–3 tons
HSPF2beats 94% · 9.7MR5SVHT60ASDucted, 5 tons and upbeats 99% · 14.8D5CSHAH06AAKNon-ducted, up to 1.5 tons
SEER2beats 97% · 22.0TMRHT18AS2Ducted, up to 1.5 tonsbeats 99% · 20.5D5CMHAH48FAKDucted, 3.5–4.5 tons
EER2beats 96% · 14.0ARHHBT24ASNon-ducted, 2 tonsbeats 99% · 18.0D5CSHAH06AAKNon-ducted, up to 1.5 tons
Heating capacity at 5°Fbeats 86% · 15,000 Btu/hARHHBT18ASNon-ducted, up to 1.5 tonsbeats 98% · 19,600 Btu/hD5CUHAH18AAKDucted, up to 1.5 tons

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