Airquest N4H5S18*K*AAA*vsZERO ZMSB-18HV-USHHR2-O
Side-by-side heat pump comparison
Airquest N4H5S18*K*AAA*
SEER2
15.2BTU/Wh
HSPF2
7.8BTU/Wh
Cooling Capacity
18000–18100BTU/hr
Refrigerant
R-410A
GWP 2088 · Higher
ZERO ZMSB-18HV-USHHR2-O
SEER2
20.7–24BTU/Wh
HSPF2
11.1–11.4BTU/Wh
Cooling Capacity
16800–18000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
ZERO ZMSB-18HV-USHHR2-O is 37% more efficient at 24.0 BTU/Wh versus 15.2 BTU/Wh for the Airquest N4H5S18*K*AAA*. The Airquest N4H5S18*K*AAA* is larger at 18100 BTU/hr versus 18000 BTU/hr. ZERO ZMSB-18HV-USHHR2-O uses a lower-impact refrigerant: R-454B (GWP 470) versus R-410A (GWP 2088). Overall, the ZERO ZMSB-18HV-USHHR2-O sits higher in the category, ranking above 84% of certified air-source heat pumps.
Efficiency
| Spec | Airquest | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 15.2 | 24 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 20.7 |
| HSPF2 (best combination)(BTU/Wh) | 7.8 | 11.4 |
| HSPF2 (worst combination)(BTU/Wh) | 7.8 | 11.1 |
| EER2 (best combination)(BTU/Wh) | 12 | 13.5 |
| COP at 5 °F | — | 2.35 |
Capacity
| Spec | Airquest | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 18100 | 18000 |
| Cooling Capacity (min)(BTU/hr) | 18000 | 16800 |
| Heating at 47 °F(BTU/hr) | 16700 | 18000 |
| Heating at 17 °F(BTU/hr) | 10400 | 15000 |
| Heating at 5 °F(BTU/hr) | — | 13000 |
Configuration
| Spec | Airquest | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Mini or Multi Split |
| Compressor Staging | Single stage | Continuously variable |
| Cold Climate Certified | No | Yes |
| Connected Capability | No | No |
| Series | PERFORMANCE 15 SEER2 HP | ZMSB Series |
| Indoor-Unit Combinations Rated | 2 | 3 |
Refrigerant
| Spec | Airquest | ZERO |
|---|---|---|
| Type | R-410A | R-454B |
| GWP Rating | R-410A (GWP:2088) | R-454B (GWP:470 | Lower GWP) |