SEER and EER Conversion
Bidirectional SEER / EER rating conversion on the NREL House Simulation Protocols relation EER = -0.02 SEER^2 + 1.12...
Example
You enter
- Value 12
- From EER
You get
- SEER 14.435
- Seer2 estimate 13.714
No published worked example is on file for this calculation. It is checked against a hand-worked derivation of its method and an independent reference test.
Details, formula, and sources
ScopeBidirectional SEER / EER rating conversion on the NREL House Simulation Protocols relation EER = -0.02 SEER^2 + 1.12 SEER: SEER 16 is about EER 12.8, not the 14.3 a flat 1.12 ratio gives. The nameplate rating governs.
Formula or tableEER = BTU/hr ÷ W (steady state at AHRI 95 °F outdoor / 80 °F indoor). SEER weights cooling capacity over an AHRI 210/240 seasonal bin profile. SEER2 / EER2 add return-static loading per the 2023 federal test procedure.
Source and editionAHRI 210/240-2023 by name. DOE 10 CFR 430 (federal energy-conservation standards) by section.
Free accessAHRI 210/240 licensed; DOE 10 CFR 430 free at ecfr.gov.
What governsEstimate. AHJ and licensed mechanical contractor govern. ACCA Manual J / D / S supersede rules of thumb.
API field namesvalue, from, SEER, SEER2_estimate
- Test conditions AHRI 95 °F outdoor / 80 °F indoor / 67 °F wet bulbAHRI 210/240
- SEER-EER relation EER = -0.02 SEER^2 + 1.12 SEER (Wassmer 2003, NREL Building America House Simulation Protocols); a nameplate EER governsNREL HSP