SEER Rating Converter
Convert between SEER, EER, and COP efficiency ratings for air conditioners and heat pumps.
Type in any field for instant conversion.
Type in any field — the others update instantly. SEER to EER uses the 0.875 approximation.
HVAC efficiency is measured using several rating systems.
SEER (Seasonal Energy Efficiency Ratio):
- BTU of cooling per watt-hour over a season
- Higher = more efficient
- US minimum: 14 SEER (as of 2023)
EER (Energy Efficiency Ratio):
- BTU per watt-hour at a single test condition (95F outdoor)
- Roughly: EER = SEER x 0.875 (approximate)
COP (Coefficient of Performance):
- Ratio of cooling output to energy input (dimensionless)
- COP = EER / 3.412
Conversions:
- SEER 14 = EER 12.25 = COP 3.59
- SEER 16 = EER 14.0 = COP 4.10
- SEER 20 = EER 17.5 = COP 5.13
- SEER 25 = EER 21.9 = COP 6.41
Energy Star minimum: SEER 15+ for central AC.