Air conditioner is significant household consumer. Inverter type air conditioner additionally complicates situation as non linear, non constant load and source of harmonics. Usually, in the household only the active energy is payable. The presented investigation shows that consumed non active power is not negligible. The treating of power is according to DIN 40110. The measurements are realized by virtual instrument for power quality monitoring based on NI LabVIEW? platform. Measurements are according to IEC 61000-4-7 and IEEE Std 1459/2010, IEEE Standard Definitions for the Measurement of Electric Power Quantities Under Sinusoidal, Nonsinusoidal, Balanced, or Unbalanced Conditions. Further on, in the household other consumers of non active power are used-washing machines, vacuum cleaners, cuisine tools, electric lighting, home electronics, computers etc. Therefore measuring of total household power consumption and searching the ways for reducing non active power are imposed.
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