Sustainability · Defined
Coefficient of performance (COP)
The ratio of useful heating or cooling output to the energy input for a stated operating condition.
Why it matters
COP changes with conditions and should not be confused with a seasonal metric or guaranteed annual result. Compare equipment using a consistent rating basis.
In practice
A project example
A heat pump’s performance at a mild outdoor temperature does not represent every hour of winter operation.
General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.