SPF shall mean the estimated average seasonal performance factor, which refers to the 'net seasonal coefficient of performance in active mode' (SCOP net ) for electrically driven heat pumps or 'net seasonal primary energy ratio in active mode' (SPER net ) for thermally driven heat pumps.

• Commission Decision of 1 March 2013 establishing the guidelines for Member States on calculating renewable energy from heat pumps from different heat pump technologies pursuant to Article 5 of Directive 2009/28/EC of the European Parliament and of the Council (notified under document C(2013) 1082)
  Place of publication: (Dz. Urz. UE L 62 z 06.03.2013, str. 27, z późn. zm.)