I would not hesitate to leave my CF in a very hot or cold car all day. Over night probably not so much but more just because there is likely no reason to do so although I would if the necessity arose.
For some reason I feel like I would be much less comfortable taking an extremely cold guitar into a warm place and playing it right off with little to no acclimation then the other way around. I think maybe the worry of condensation developing on the internal pickup electrics although with my K&K there's not much to worry about.
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