- 1). Write down the four EER coefficients that made the SEER average. They will probably be listed right where you saw the SEER. Because the SEER is the average of the EERs, you cannot extrapolate the coefficients from the SEER on its own. The EER coefficients will be the rates for the unit at 100 percent power, 75 percent, 50 percent and 15 percent.
- 2). Plug the four EER coefficients into the following formula. A is the 100 percent EER; B is the 75 percent EER; C is the 50 percent EER; and D is the 25 percent EER.
1/(0.01/A + 0.42/B + 0.45/C + 0.12/D) = IPLV - 3). Run the calculation on a calculator. The output, as indicated by the equation, is your IPLV.
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