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, ducted 3.5–4.5 tons
Balances heating (5°F output and efficiency, HSPF2) and cooling (SEER2, EER2), each rating against units their size.
Showing Ducted, 3.5–4.5 tons (39,000–56,999 Btu/h cooling). What size is my system?
TGM
- 1OTV18HN048Awith ducted air handler OTA18C006ATGMAlso listed as OTV18HN060A4 tons · 47,000 Btu/h · DuctedCold-climate pick, score 72.2Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 72% (Capacity at 5°F vs 47°F)
- Good
- Efficiency at 5°F
- 2.30 (COP at 5°F)
- Great
- Winter efficiency
- 9.2 (HSPF2)
- Great
- Cooling efficiency
- 18.5 (SEER2)
- Great
- Hot-day cooling
- 11.5 (EER2)
- Good
- 2MTVC2OCN060Awith ducted air handler MTA20C048ATGM4 tons · 47,000 Btu/h · DuctedCold-climate pick, score 60.1Meets CEE 2025, CEE 2026, Xcel CC
- Heat kept at 5°F
- 70% (Capacity at 5°F vs 47°F)
- Below the middle
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 9.5 (HSPF2)
- Great
- Cooling efficiency
- 18.5 (SEER2)
- Great
- Hot-day cooling
- 12.0 (EER2)
- Great
- 3GMRSHT42AS5TGM3.5 tons · 42,000 Btu/h · DuctedCold-climate pick, score 55.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 86% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 1.90 (COP at 5°F)
- Below the middle
- Winter efficiency
- 8.1 (HSPF2)
- Good
- Cooling efficiency
- 18.0 (SEER2)
- Great
- Hot-day cooling
- 12.0 (EER2)
- Great
Viessmann
- 1D5CMHAH48FAKViessmann4 tons · 47,000 Btu/h · DuctedCold-climate pick, score 82.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 11.0 (HSPF2)
- Top 10%
- Cooling efficiency
- 20.5 (SEER2)
- Top 10%
- Hot-day cooling
- 11.7 (EER2)
- Good
- 2D5CMHAH55FAKViessmann4.5 tons · 53,000 Btu/h · DuctedCold-climate pick, score 81.2Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 87% (Capacity at 5°F vs 47°F)
- Great
- Efficiency at 5°F
- 2.10 (COP at 5°F)
- Good
- Winter efficiency
- 10.7 (HSPF2)
- Top 10%
- Cooling efficiency
- 20.2 (SEER2)
- Top 10%
- Hot-day cooling
- 11.7 (EER2)
- Good
- 3D5CUHAH48AAKwith ducted air handler D5FUHAH60XAKViessmann4 tons · 48,000 Btu/h · DuctedCold-climate pick, score 76.7Meets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
- Heat kept at 5°F
- 100% (Capacity at 5°F vs 47°F)
- Top 10%
- Efficiency at 5°F
- 2.00 (COP at 5°F)
- Good
- Winter efficiency
- 9.5 (HSPF2)
- Great
- Cooling efficiency
- 17.5 (SEER2)
- Good
- Hot-day cooling
- 12.0 (EER2)
- Great
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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