DIRECT AIR DIRM4-24HXPRO28-1ZvsViessmann D5CURAH24AAK+KSAIC0701230
Side-by-side heat pump comparison
DIRECT AIR DIRM4-24HXPRO28-1Z
SEER2
19–21BTU/Wh
HSPF2
11.6–13.5BTU/Wh
Cooling Capacity
22000–24000BTU/hr
Cold Climate
Yes
Cold climate certified
Viessmann D5CURAH24AAK+KSAIC0701230
SEER2
16BTU/Wh
HSPF2
9BTU/Wh
Cooling Capacity
23800BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
DIRECT AIR DIRM4-24HXPRO28-1Z is 24% more efficient at 21.0 BTU/Wh versus 16.0 BTU/Wh for the Viessmann D5CURAH24AAK+KSAIC0701230. The DIRECT AIR DIRM4-24HXPRO28-1Z is larger at 24000 BTU/hr versus 23800 BTU/hr. Overall, the DIRECT AIR DIRM4-24HXPRO28-1Z sits higher in the category, ranking above 44% of certified air-source heat pumps.
Efficiency
| Spec | DIRECT AIR | Viessmann |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 21 | 16 |
| SEER2 (worst combination)(BTU/Wh) | 19 | 16 |
| HSPF2 (best combination)(BTU/Wh) | 13.5 | 9 |
| HSPF2 (worst combination)(BTU/Wh) | 11.6 | 9 |
| EER2 (best combination)(BTU/Wh) | 13 | 10 |
| COP at 5 °F | 2.34 | 1.98 |
Capacity
| Spec | DIRECT AIR | Viessmann |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 24000 | 23800 |
| Cooling Capacity (min)(BTU/hr) | 22000 | 23800 |
| Heating at 47 °F(BTU/hr) | 29000 | 25400 |
| Heating at 17 °F(BTU/hr) | 22200 | 19400 |
| Heating at 5 °F(BTU/hr) | 24200 | 19800 |
Configuration
| Spec | DIRECT AIR | Viessmann |
|---|---|---|
| Product Type | HP - Mini or Multi Split | HP - Split System |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | Yes | Yes |
| Connected Capability | No | No |
| Series | DIR Series | Crossover Heat Pump |
| Indoor-Unit Combinations Rated | 4 | 1 |
Refrigerant
| Spec | DIRECT AIR | Viessmann |
|---|---|---|
| Type | R-454B | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-454B (GWP:470 | Lower GWP) |