In the opinion of Eurovent and its national member associations, fan efficiency as defined in the ‘EU Fan Regulation’ does not constitute a good measure to define the energy efficiency of evaporative heat transfer equipment. Instead, energy efficiency for evaporative heat transfer equipment should be defined as a cooling efficiency, meaning a ratio between cooling capacity per required electrical power. Energy targets could be defined similar to the energy targets prescribed in the ASHRAE 90.1 energy standard for commercial building energy codes in the United States. Eurovent recently initiated the development of a comparable European measure focussing on evaporative cooling equipment.