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Air conditioner

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An air-conditioner is an indoor installation for the adjustment of room climate independently from the outdoor climate. Although its main task is to cool down the room temperature, both heating and humidifying can be achieved, too. The cause of the alternating electric and magnetic fields at the fundamental frequency of 50 Hz respectively 60 Hz depends on the operating mode: For cooling down the room temperature, the fields are caused by the operation of the cooling unit (similarly to the functional principle of a refrigerator), while for heating up or humidifying, the operation of the heating elements for warming up air or water are responsible.

Frequency ranges:
  • 50–60 Hz
Type of field:
electric and magnetic

Measurements (acc. to literature)

Measurand Value Feature Remarks
magnetic flux density 1 µT (maximum) - maximum value at a distance of 80 cm [1]
magnetic flux density 1.5 µT (maximum) - maximum value at a distance of 40 cm [1]
magnetic flux density 4.5 µT (maximum) - maximum value directly in front of the device [1]
magnetic flux density 381 µT (maximum, calculated) - at the surface of the device at 50 Hz [2]


  1. Farag AS et al. (1998): Electromagnetic fields in the home
  2. Leitgeb N et al. (2008): Magnetic emission ranking of electrical appliances. A comprehensive market survey