I keep the A/C on all the time for the reasons ovekvam states, hardly makes a dent in consumption esp in diesels. In 2000 a friend had an e46 318i and the A/C dropped the mpg by 3 when in use, I'd expect it has far less effect these days even on the smaller petrols.
I find setting the climate sensitivity to middle and temp to 20 in the Winter gives a comfy environment without getting so hot you fall asleep.
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120d Sport gone and replaced with X1 18d XDrive MSport Auto.
No Xenons but plenty of creature comforts.
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