OAH18H/O6S4P
OAH Series
7 published source records · source checked Sep 21, 2026
Each efficiency range summarizes published EPA records for OAH18H/O6S4P. The highest SEER2 and HSPF2 may belong to different combinations. Open a source record below to see its ratings and the scope of its component information.
Model patterns and component strings are preserved exactly. How to read model patterns and combinations →
Heating performance & equipment details
Ranges include the 7 published source records for this model. Values in different rows may describe different configurations. Open an individual record to compare values from the same test configuration.
| Reported field | Value / range | Records supplying it |
|---|---|---|
| SEER2 · BTU/Wh | 18–21.7 | 7 / 7 |
| EER2 · BTU/Wh | 12–13 | 7 / 7 |
| HSPF2 · BTU/Wh | 10.3–12.3 | 7 / 7 |
| Cooling capacity · BTU/h | 16,000–18,000 | 7 / 7 |
| Heating capacity at 47°F / 8.3°C · BTU/h | 17,000–20,000 | 7 / 7 |
| Heating capacity at 17°F / −8.3°C · BTU/h | 14,200–16,600 | 7 / 7 |
| Heating capacity at 5°F / −15°C · BTU/h | 17,000–18,000 | 7 / 7 |
| COP at 5°F / −15°C | 1.86–2.1 | 7 / 7 |
| Equipment / loop type | HP - Mini or Multi Split | 7 / 7 |
| Refrigerant / source-reported GWP | R-454B (GWP:470 | Lower GWP) | 7 / 7 |
| Compressor staging | Continuously variable | 7 / 7 |
| Connected capability | No | 7 / 7 |
47°F = 8.3°C; 17°F = −8.3°C; 5°F = −15°C. COP is dimensionless. These are reported rating points, not a prediction of a particular home’s heat demand or operating limit.
Matched systems
Each row is one source record. The component column distinguishes listed combinations from outdoor-model ratings without an indoor configuration.
| Indoor unit / required furnace | SEER2BTU/Wh | HSPF2BTU/Wh | Heating capacity at 5°F / −15°CBTU/h | COP at 5°F / −15°C | Record & comparison |
|---|---|---|---|---|---|
IUMW118H/I61PCold climate designationAHRI reference: 217678068 | 21.70 | 10.80 | 18000 | 2.00 | EPA 4680006 → |
IUMC118H/I61PCold climate designationAHRI reference: 217678097 | 20.60 | 12.20 | 17500 | 1.89 | EPA 4680036 → |
IUMFC18H/I61PCold climate designationAHRI reference: 217678089 | 20.40 | 10.30 | 17000 | 1.86 | EPA 4680025 → |
IUMC418H/I61PCold climate designationAHRI reference: 217678073 | 20.00 | 12.30 | 17000 | 1.90 | EPA 4680011 → |
IUMCO18H/I61PCold climate designationAHRI reference: 217678088 | 20.00 | 10.30 | 17500 | 1.95 | EPA 4680024 → |
IUMDH18H/I63PCold climate designationAHRI reference: 217678082 | 18.40 | 11.10 | 18000 | 2.10 | EPA 4680018 → |
IUMDL18H/I63PCold climate designationAHRI reference: 217678079 | 18.00 | 10.50 | 18000 | 2.00 | EPA 4680016 → |
Sources and documentation
The table uses public EPA ENERGY STAR data. AHRI references are reported by EPA and have not been independently checked with AHRI. Source records do not establish availability, installation suitability or rebate eligibility.
No manufacturer manual has been matched to this model.
Collection method, revision history and known limitations →