Why do we have an EU energy label?

Why do we have an EU energy label?
An energy label has been introduced for vacuum cleaners in line with EU resolutions to reduce energy consumption within Europe and to make the performance of appliances more transparent for the customer. It will also contribute towards environmental protection. From September 2017, the maximum nominal power consumption for vacuum cleaners is limited to 900 W.
The following can be found on the energy label:
Energy efficiency rating
It indicates how much power each vacuum cleaner uses and hence its electricity consumption. Factors not taken into account include the lifespan of the appliance, environmentally-friendly manufacturing processes, and how easily recyclable the product is.
Average annual energy consumption
The average annual energy consumption is stated in kilowatt hours per year (kWh/a). It is calculated based on an average household with 87 square metres of living space being vacuumed 50 times per year. The actual consumption value depends on the frequency of use of the vacuum cleaner.
Dust re-emission class
The dust re-emission class states how clean the exhaust air of the vacuum cleaner is.
Sound power level
The sound power level indicates the sound level of the appliance in decibels. This value is measured on carpet.
Carpet cleaning performance class
The carpet cleaning performance class is determined by rolling dust into a carpet and then vacuuming it up. The more dust that is vacuumed up, the higher the cleaning performance of the vacuum cleaner.
Hard floor cleaning performance class
The hard floor cleaning performance class is determined by spreading dust onto a cracked wooden panel then vacuuming it. The more dust that is vacuumed up, the higher the cleaning performance of the vacuum cleaner.
Features vary depending on model. Images for illustration purposes only.