EER Rating
Use the EER Rating for hvac planning. Enter Cooling output (BTU/hr) and Power input (watts) to get a clear result, formula explanation, and practical checks.
EER Rating measurements
Enter your values, then calculate.
Result
How to calculate eer rating
EER (Energy Efficiency Ratio) measures cooling efficiency by dividing cooling output by power input — a standard rating used to compare air conditioner efficiency, especially under specific test conditions.
How the calculation works
EER = Cooling output (BTU/hr) ÷ Power input (watts).
Example
A unit producing 12,000 BTU/hr while drawing 1,200 watts: EER = 12,000 ÷ 1,200 = 10.
Frequently asked questions
What's the difference between EER and SEER?
EER is measured at a single, fixed outdoor temperature and humidity condition (typically 95°F), giving a snapshot efficiency figure. SEER (Seasonal Energy Efficiency Ratio) averages performance across a range of temperatures over a full cooling season, making it more representative of real-world seasonal efficiency.
EER Rating
EER = Cooling output (BTU/hr) ÷ Power input (watts).
Let's understand your eer rating result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for EER Rating
- Higher EER means more cooling output per watt of electricity — a more efficient unit for a given cooling capacity.
- EER and SEER are different ratings measured under different conditions — EER reflects a single fixed test condition, while SEER reflects a seasonal average, so they aren't directly interchangeable.
Common EER Rating Mistakes to Avoid
- Comparing an EER rating directly against a SEER rating as if they measured the same thing, when they use different test methodologies.
When to Use This Calculator
EER (Energy Efficiency Ratio) measures cooling efficiency by dividing cooling output by power input — a standard rating used to compare air conditioner efficiency, especially under specific test conditions.