What do you have the circulation control set to? There are 3 settings (auto, manual, off). If you are recirculating the air in the cabin you aren't bringing in any of the fresh air from outside.
Keep in mind, these days it is better to leave the car on automatic. The AC compressor does not just function to make the air colder, it removes humidity. The system in the BMW should automatically switch the compressor on and off as needed.
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