Most air conditioners are specified  in catalogues by air power measured in British Thermal Units (BTU).

1 BTU is equal to 1.055 joules.

W to BTU ratio is approximately 1 to 3.41

EER (energy efficiency rating - Energy efficiency ratio when operating the air conditioner in cooling mode)

COP (coefficient of performance - Energy efficiency ratio when operating the air conditioner in heating mode) are equal to the ratio of BTU output devoted to power consumption in W (Watts) with the relevant regime.