Formula & example
EER=3.412142·COP; COP=EER/3.412142.
EER 12 corresponds to COP about 3.52; 36,000 BTU/h at EER 12 draws about 3,000 W under rating conditions.
HVAC engineering calculator · Updated Sep 17, 2026
EER to COP Converter — HVAC Efficiency Conversion
Convert EER in BTU/Wh to COP and back, and estimate input power from cooling capacity and efficiency.
Inputs
Result
COP 3.5168525
EER 12 BTU/Wh
Estimated input 3,000 W
Cooling capacity 10.550559 kW
Assumptions & limits
- EER is an instantaneous rating-point metric, not seasonal SEER.
- Cooling capacity and EER must refer to the same operating condition for power estimation.
Frequently asked questions
What does this EER to COP Converter calculate?
Convert EER in BTU/Wh to COP and back, and estimate input power from cooling capacity and efficiency.
Can I use SI and US customary units?
Yes. The calculator exposes the unit basis in the inputs and reports useful cross-unit outputs where the engineering workflow benefits from them.
Is this a replacement for HVAC design software?
No. It is a transparent deterministic engineering calculator for sizing, diagnostics and cross-checks. Final equipment, duct and refrigeration decisions should use measured conditions, manufacturer data and applicable codes or standards.