In our office there was a discussion about ambient temp.
Usually it is 70 Deg F. But an engineer suggested to put 40 deg F since at some time though out the year , ambient air gets to 40 deg F and the there will be a larger difference with the Operating (130 Deg F ) temp.

Should we do that ? or , should we define a separate new temp into load cases and insert 40 deg F into it?