# Seasonal Energy Efficiency Rating

on . Posted in HVAC Engineering

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

$$\large{ SEER = \frac{ 1 \; \left(EER\;100\%\right) \;+\;42 \; \left(EER\;75\% \right) \;+\;12\;\left(EER\;250\%\right) }{100} }$$
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

$$\large{ SEER = \frac{EER}{0.875} }$$
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

$$\large{ SEER = \frac{ 1.12 \;-\; \sqrt{1.2544 \;-\; EER \; 0.08} }{0.04} }$$
Symbol English Metric
$$\large{ SEER }$$ = seasonal energy efficiency rating (when EER is below 14) $$\large{dimensionless}$$
$$\large{ EER }$$ = energy efficiency rating $$\large{dimensionless}$$ 