TGM vs Viessmann: heat pump ratings compared
Against heat pumps of the same size and type, a typical TGM model beats 45% and a typical Viessmann model 60%. Viessmann rates higher overall.
Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated
TGM
45%
of similar heat pumps beaten by its typical model
Below average77 models listed
Viessmann
60%
of similar heat pumps beaten by its typical model
Well above average43 models listed
- Efficiency on a 5°F dayCOP at 5°FTGM: Beats 48%Viessmann: Beats 53%
- Heating power kept at 5°FCapacity at 5°F vs 47°FTGM: Beats 42%Viessmann: Beats 72%
- Winter-long heating efficiencyHSPF2TGM: Beats 41%Viessmann: Beats 74%
- Summer-long cooling efficiencySEER2TGM: Beats 45%Viessmann: Beats 59%
- Hot-day cooling efficiencyEER2TGM: Beats 42%Viessmann: Beats 49%
Average (50%)Dashed outline: the other brand, for comparison
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Rebate standards
CEE 2025
- TGM
- 58%
- Viessmann
- 84%
Xcel CC
- TGM
- 55%
- Viessmann
- 79%
CEE Advanced
- TGM
- 1%
- Viessmann
- 5%
ENERGY STAR CC
- TGM
- 21%
- Viessmann
- 70%
All-around best, ductless 2.5–3 tons
Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.
Showing Ductless, 2.5–3 tons (27,000–38,999 Btu/h cooling). What size is my system?
TGM
- 1GMRSHT36AS4TGM3 tons · 36,000 Btu/h · DuctlessCold-climate pick, score 77.2Meets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.10 (COP at 5°F)
- Great
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 21.0 (SEER2)
- Below the middle
- Hot-day cooling
- 12.0 (EER2)
- Good
- 2TMRHT36AS4TGM3 tons · 38,000 Btu/h · DuctlessCold-climate pick, score 53.9Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 74% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 23.0 (SEER2)
- Great
- Hot-day cooling
- 11.2 (EER2)
- Below the middle
- 3TMRHT27AS3TGM2.5 tons · 28,000 Btu/h · DuctlessCold-climate pick, score 55.0Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 75% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 10.0 (HSPF2)
- Good
- Cooling efficiency
- 22.0 (SEER2)
- Good
- Hot-day cooling
- 11.2 (EER2)
- Below the middle
Viessmann
- 1D5CMHAH30EAKViessmann2.5 tons · 30,000 Btu/h · DuctlessCold-climate pick, score 80.9Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 116% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 10.7 (HSPF2)
- Great
- Cooling efficiency
- 24.0 (SEER2)
- Top 10%
- Hot-day cooling
- 13.2 (EER2)
- Top 10%
- 2D5CMHAH36EAKViessmann3 tons · 36,000 Btu/h · DuctlessCold-climate pick, score 78.1Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 10.7 (HSPF2)
- Great
- Cooling efficiency
- 23.1 (SEER2)
- Great
- Hot-day cooling
- 13.1 (EER2)
- Great
- 3D5CLHAH36AAKwith ductless indoor unit D5FCFAH36XAKViessmann3 tons · 36,400 Btu/h · DuctlessCold-climate pick, score 89.4Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 104% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.02 (COP at 5°F)
- Great
- Winter efficiency
- 10.8 (HSPF2)
- Top 10%
- Cooling efficiency
- 20.2 (SEER2)
- Below the middle
- Hot-day cooling
- 12.0 (EER2)
- Good
These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.
Next steps
The advanced view adds ranks, both brands’ models inside every size class, standout models per rating and cold-weather curves.
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