Viessmann heat pumps: how do their ratings compare?

A typical Viessmann heat pump beats 60% of similar heat pumps (same size and type), which is well above average. Viessmann has 43 heat pump models in this list.

Covers heat pumps sold new today (R-454B and R-32 refrigerant). See older R-410A models · Updated Oct 10, 2026

Overall score

60%

of similar heat pumps beaten by its typical model

Well above average

Viessmann has no QMID (the manufacturer ID the 25C tax credit needs) on file, so it is not ranked against other brands. Based on 59 models with every rating.

Viessmann, rating by ratingStrongest on winter-long heating efficiency (beats 74%), weakest on hot-day cooling efficiency (beats 49%).

Efficiency on a 5°F dayCOP at 5°FBeats 53%
Heating power kept at 5°FCapacity at 5°F vs 47°FBeats 72%
Winter-long heating efficiencyHSPF2Beats 74%
Summer-long cooling efficiencySEER2Beats 59%
Hot-day cooling efficiencyEER2Beats 49%

Average (50%)

Each bar: the share of similar heat pumps a typical model beats on that rating.

Want Viessmann’s ranks and its models inside every size class? Switch to Advanced

Rebate standards

Share of this brand’s models that meet the efficiency levels rebate programs use. Programs can have other rules too.

84%
meet CEE 2025 Tier 1, the level many utility rebates use.
36 models. All brands: 57%.
See them
79%
meet Xcel Energy Colorado’s cold-climate rebate levels.
34 models. All brands: 53%.
See them
5%
reach the cold-climate tier: full heating output and a COP of 2.1 or more at 5°F.
2 models. All brands: 3%.
See them

Top Viessmann cold-climate picks, by size

Only units that keep at least 70% of their heat at 5°F, ranked on heat kept, efficiency at 5°F and seasonal efficiency (HSPF2), against units their size.

Showing Ductless, Up to 1.5 tons (under 21,000 Btu/h cooling). What size is my system?

5 of Viessmann’s 5 models of this size and type qualify.

1D5CSHAH06AAKwith ductless indoor unit D5FSHAH06XAKViessmann0.5 tons · 6,000 Btu/h · DuctlessKeeps 110% of its heat at 5°FMeets CEE 2025, CEE 2026, CEE Advanced, Xcel CC, DOE CCHP, ENERGY STAR CC
Heat kept at 5°F
110% (Capacity at 5°F vs 47°F)
Top 10%
Efficiency at 5°F
2.40 (COP at 5°F)
Top 10%
Seasonal efficiency
14.8 (HSPF2)
Top 10%
96.7score / 100
2D5CSHAH12AAKwith ductless indoor unit D5FSCAH12XAKViessmann1 ton · 12,000 Btu/h · DuctlessKeeps 96% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
Heat kept at 5°F
96% (Capacity at 5°F vs 47°F)
Great
Efficiency at 5°F
1.99 (COP at 5°F)
Good
Seasonal efficiency
11.6 (HSPF2)
Top 10%
76.1score / 100
3D5CMHAH18CAKViessmann1.5 tons · 19,000 Btu/h · DuctlessKeeps 95% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
Heat kept at 5°F
95% (Capacity at 5°F vs 47°F)
Great
Efficiency at 5°F
2.00 (COP at 5°F)
Good
Seasonal efficiency
10.5 (HSPF2)
Great
74.3score / 100
4D5CSHAH18AAKwith ductless indoor unit D5FSHAH18XAKViessmann1.5 tons · 18,000 Btu/h · DuctlessKeeps 100% of its heat at 5°FMeets 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
1.92 (COP at 5°F)
Below the middle
Seasonal efficiency
11.0 (HSPF2)
Great
73.8score / 100
5D5CSHAH09AAKwith ductless indoor unit D5FSCAH12XAKViessmann1 ton · 9,000 Btu/h · DuctlessKeeps 110% of its heat at 5°FMeets CEE 2025, CEE 2026, Xcel CC, ENERGY STAR CC
Heat kept at 5°F
110% (Capacity at 5°F vs 47°F)
Top 10%
Efficiency at 5°F
1.84 (COP at 5°F)
Below the middle
Seasonal efficiency
12.2 (HSPF2)
Top 10%
73.6score / 100

These are certified test ratings, not a recommendation for your home. The right size comes from a load calculation by a contractor.

What to do next

The advanced view has Viessmann’s ranks on each rating, its models inside every size and type, cold-weather curves and its newest certifications.

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