How can I calculate the power consumption (electricity) of my air conditioner?

The power (electricity) consumption is related with the operating hours of the air conditioning unit. If the air conditioner is constant speed (ON/OFF), its power consumption is approximately equal to the power input multiplying with the operating hours of the compressor. If the air conditioner is Inverter, is more difficult to calculate the power consumption, since the input power varies depending on the compressor’s frequency.