Calculating power consumption in portable air conditioning unit
Cooling capacity can exceed power consumption because it's moving heat from one place to another, not creating it. 

Those ratings don't actually tell you the power consumption, but it should be less than 1311W, because 1311 is the VA (volts * amperes) and we don't know the power factor. 

If you want to know the actual power consumption you can measure it with a device like a Kill a Watt or maybe there are additional specifications available. 

The actual power consumption will vary with the settings and the operating conditions (temperature and humidity). The A/C unit turns on and off to try to maintain the temperature. If it is off all the time it draws nothing or maybe a tiny bit for the remote control etc., if it runs all the time it uses the maximum.