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      12-02-2012, 05:05 PM   #4
Brigadier General

Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

Posts: 4,556
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If temperatures fluctuate around freezing, and humidity changes in your environment, I've found it best if left on, keeps the car dry inside and misting doesn't start to form.

Variable output compressors use very little power when in colder temperatures, so not like summer use for power/fuel consumption.