Atomi Smart AT2240vsZERO ZSOVA-18HDMB-USHH
Side-by-side heat pump comparison
Atomi Smart AT2240
SEER2
21.2BTU/Wh
HSPF2
8.9BTU/Wh
Cooling Capacity
18100BTU/hr
Refrigerant
R-32
GWP 675 · Lower
ZERO ZSOVA-18HDMB-USHH
SEER2
19BTU/Wh
HSPF2
9.7BTU/Wh
Cooling Capacity
18000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
Atomi Smart AT2240 is 10% more efficient at 21.2 BTU/Wh versus 19.0 BTU/Wh for the ZERO ZSOVA-18HDMB-USHH. The Atomi Smart AT2240 is larger at 18100 BTU/hr versus 18000 BTU/hr. ZERO ZSOVA-18HDMB-USHH uses a lower-impact refrigerant: R-454B (GWP 470) versus R-32 (GWP 675). Overall, the Atomi Smart AT2240 sits higher in the category, ranking above 36% of certified air-source heat pumps.
Efficiency
| Spec | Atomi Smart | ZERO |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 21.2 | 19 |
| SEER2 (worst combination)(BTU/Wh) | 21.2 | 19 |
| HSPF2 (best combination)(BTU/Wh) | 8.9 | 9.7 |
| HSPF2 (worst combination)(BTU/Wh) | 8.9 | 9.7 |
| EER2 (best combination)(BTU/Wh) | 13.2 | 12.5 |
| COP at 5 °F | — | 2 |
Capacity
| Spec | Atomi Smart | ZERO |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 18100 | 18000 |
| Cooling Capacity (min)(BTU/hr) | 18100 | 18000 |
| Heating at 47 °F(BTU/hr) | 19282 | 19000 |
| Heating at 17 °F(BTU/hr) | 11575 | 15000 |
| Heating at 5 °F(BTU/hr) | — | 18000 |
Configuration
| Spec | Atomi Smart | ZERO |
|---|---|---|
| Product Type | HP - Split System | HP - Split System |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | No | Yes |
| Connected Capability | No | No |
| Series | AT2240 | ZAVA Series |
| Indoor-Unit Combinations Rated | 1 | 1 |
Refrigerant
| Spec | Atomi Smart | ZERO |
|---|---|---|
| Type | R-32 | R-454B |
| GWP Rating | R-32 (GWP:675 | Lower GWP) | R-454B (GWP:470 | Lower GWP) |