4PAMSHH18-SZO
PerfectAire · HP - Mini or Multi Split
21.7BTU/Wh
10.8BTU/Wh
18000BTU/hr
Yes
PerfectAire 4PAMSHH18-SZO: SEER2 21.7 BTU/Wh, around the middle of the range for air-source heat pumps (category median 20 BTU/Wh).
Where this model sits
The PerfectAire 4PAMSHH18-SZO is a 18000 BTU/hr hp - mini or multi split using R-454B, a refrigerant with moderate global warming potential (GWP 470). At 21.7 BTU/Wh it ranks around the middle of the 12,218 certified air-source heat pumps models. Among similar-sized air-source heat pumps (within 10% of its size), it is more efficient than the peer median of 21 BTU/Wh. In this size range, comparable Midea models average 21.4 BTU/Wh and TOSOT models average 21 BTU/Wh.
Specifications
| Efficiency | |
|---|---|
| SEER2 (best combination) | 21.7BTU/Wh |
| SEER2 (worst combination) | 21.7BTU/Wh |
| HSPF2 (best combination) | 10.8BTU/Wh |
| HSPF2 (worst combination) | 10.8BTU/Wh |
| EER2 (best combination) | 13BTU/Wh |
| COP at 5 °F | 2 |
| Capacity | |
| Cooling Capacity (max) | 18000BTU/hr |
| Cooling Capacity (min) | 18000BTU/hr |
| Heating at 47 °F | 18000BTU/hr |
| Heating at 17 °F | 16600BTU/hr |
| Heating at 5 °F | 18000BTU/hr |
All 25 specifications
| Configuration | |
|---|---|
| Product Type | HP - Mini or Multi Split |
| Compressor Staging | Continuously variable |
| Cold Climate Certified | Yes |
| Connected Capability | No |
| Series | 4PAM Series |
| Indoor-Unit Combinations Rated | 1 |
| Refrigerant | |
| Type | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) |
| Identifiers | |
| Model Number | 4PAMSHH18-SZO |
| ENERGY STAR ID | ES_1121980_4PAMSHH18-SZO_04072025232653_29217221805 |
| Partner | Perfect Aire, LLC |
| Date Certified | 2026-05-28 |
| Available From | 2025-04-08 |
| Markets | United States, Canada |
Documentation
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