Tempstar D5CUHAH18AAKvsViessmann D5CMHAH18CAK
Side-by-side heat pump comparison
Tempstar D5CUHAH18AAK
SEER2
15.2–19.3BTU/Wh
HSPF2
9–12.5BTU/Wh
Cooling Capacity
17700–18800BTU/hr
Cold Climate
Yes
Cold climate certified
Viessmann D5CMHAH18CAK
SEER2
20–25BTU/Wh
HSPF2
10–10.5BTU/Wh
Cooling Capacity
19000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
Viessmann D5CMHAH18CAK is 23% more efficient at 25.0 BTU/Wh versus 19.3 BTU/Wh for the Tempstar D5CUHAH18AAK. The Viessmann D5CMHAH18CAK is larger at 19000 BTU/hr versus 18800 BTU/hr. Overall, the Viessmann D5CMHAH18CAK sits higher in the category, ranking above 89% of certified air-source heat pumps.
Efficiency
| Spec | Tempstar | Viessmann |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 19.3 | 25 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 20 |
| HSPF2 (best combination)(BTU/Wh) | 12.5 | 10.5 |
| HSPF2 (worst combination)(BTU/Wh) | 9 | 10 |
| EER2 (best combination)(BTU/Wh) | 12.5 | 15 |
| COP at 5 °F | 2.12 | 2 |
Capacity
| Spec | Tempstar | Viessmann |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 18800 | 19000 |
| Cooling Capacity (min)(BTU/hr) | 17700 | 19000 |
| Heating at 47 °F(BTU/hr) | 22600 | 20000 |
| Heating at 17 °F(BTU/hr) | 16100 | 20000 |
| Heating at 5 °F(BTU/hr) | 19600 | 19000 |
Configuration
| Spec | Tempstar | Viessmann |
|---|---|---|
| Product Type | HP - Split System | HP - Mini or Multi Split |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | Yes | Yes |
| Connected Capability | No | No |
| Series | D5F Series | D5C Series |
| Indoor-Unit Combinations Rated | 38 | 3 |
Refrigerant
| Spec | Tempstar | Viessmann |
|---|---|---|
| Type | R-454B | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-454B (GWP:470 | Lower GWP) |