DIRECT AIR DIRM4-48CS19-OUvsZERO ZOV-48HDTB
Side-by-side heat pump comparison
DIRECT AIR DIRM4-48CS19-OU
SEER2
15.2–16BTU/Wh
HSPF2
8.5–9BTU/Wh
Cooling Capacity
45000–48000BTU/hr
Cold Climate
Yes
Cold climate certified
ZERO ZOV-48HDTB
SEER2
18BTU/Wh
HSPF2
8.5BTU/Wh
Cooling Capacity
47000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
ZERO ZOV-48HDTB is 11% more efficient at 18.0 BTU/Wh versus 16.0 BTU/Wh for the DIRECT AIR DIRM4-48CS19-OU. The DIRECT AIR DIRM4-48CS19-OU is larger at 48000 BTU/hr versus 47000 BTU/hr. Overall, the ZERO ZOV-48HDTB sits higher in the category, ranking above 83% of certified air-source heat pumps.
Efficiency
| Spec | DIRECT AIR | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 16 | 18 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 18 |
| HSPF2 (best combination)(BTU/Wh) | 9 | 8.5 |
| HSPF2 (worst combination)(BTU/Wh) | 8.5 | 8.5 |
| EER2 (best combination)(BTU/Wh) | 10 | 9 |
| COP at 5 °F | 1.85 | 1.80 |
Capacity
| Spec | DIRECT AIR | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 48000 | 47000 |
| Cooling Capacity (min)(BTU/hr) | 45000 | 47000 |
| Heating at 47 °F(BTU/hr) | 48000 | 47000 |
| Heating at 17 °F(BTU/hr) | 34800 | 35000 |
| Heating at 5 °F(BTU/hr) | 41000 | 33000 |
Configuration
| Spec | DIRECT AIR | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Split System |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | Yes | Yes |
| Connected Capability | No | No |
| Series | DIR Series | Z-MAX |
| Indoor-Unit Combinations Rated | 4 | 1 |
Refrigerant
| Spec | DIRECT AIR | ZERO |
|---|---|---|
| Type | R-454B | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-454B (GWP:470 | Lower GWP) |