Calculation method for annual performance factor of inverter air conditioners

China inverter air conditioner industry adopts annual performance factor（APF） as energy efficiency evaluation index. Presents the problems of the calculation methods for APF of inverter air conditioners, due to the characteristics of wide operating range and adjustment range of inverter air conditioners. The calculation method does not match the actual situation when the environment temperature is higher than 35 ℃，and suggests the improvement opinions.