# Seasonal Energy Efficiency Rating

Seasonal energy efficiency rating, abbreviated as SEER, also called seasonal energy efficiency ratio, a dimensionless number, measure the efficiency a residental central cooling will operate over an entire cooling season.

- seasonal Btu of cooling
- seasonal watt-hours used

## Seasonal Energy Efficiency Rating (Varying Weather Conditions) formula |
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\(\large{ SEER = \frac{ 1 \; \left(EER\;100\%\right) \;+\;42 \; \left(EER\;75\% \right) \;+\;12\;\left(EER\;250\%\right) }{100} }\) | ||

Symbol |
English |
Metric |

\(\large{ SEER }\) = seasonal energy efficiency rating (varying weather conditions) | \(\large{dimensionless}\) | |

\(\large{ EER }\) = energy efficiency rating | \(\large{dimensionless}\) |

## Seasonal Energy Efficiency Rating (EER above 14) formula |
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\(\large{ SEER = \frac{EER}{0.875} }\) | ||

Symbol |
English |
Metric |

\(\large{ SEER }\) = seasonal energy efficiency rating (when EER is above 14) | \(\large{dimensionless}\) | |

\(\large{ EER }\) = energy efficiency rating | \(\large{dimensionless}\) |

## Seasonal Energy Efficiency Rating (EER below 14) formula |
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\(\large{ SEER = \frac{ 1.12 \;-\; \sqrt{1.2544 \;-\; EER \; 0.08} }{0.04} }\) | ||

Symbol |
English |
Metric |

\(\large{ SEER }\) = seasonal energy efficiency rating (when EER is below 14) | \(\large{dimensionless}\) | |

\(\large{ EER }\) = energy efficiency rating | \(\large{dimensionless}\) |