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This Technical Specification provides guidance on the practical applications of the principles of performance measurement of air-cooled air-conditioners and air-to-air heat pumps as described in ISO 5151, ISO 13253, and ISO 15042. This document (FprCEN ISO/TS 16491:2012) has been prepared by Technical Committee ISO/TC 86 "Refrigeration and air-conditioning" in collaboration with Technical Committee CEN/TC 113 "Heat pumps and air conditioning units", the secretariat of which is held by AENOR. Committee NA 044-00-06 AA "Elektromotorisch angetriebene Wärmepumpen und Luftkonditionierungsgeräte" ("Heat pumps with electrically driven compressors and air conditioners") is responsible for the German collaboration.