I don't know where you live but I've spent enough winters right next to Cupertino, 20 minutes walking distance from 1 Infinite Loop to be precise, and it's not warm at all, in fact it's cold as hell without heating (not as cold as some places apparently, but still cold enough to freeze your balls off, or cause your laptop to shutdown). So no, it's chemistry at work, not "Cupertino is warm enough to not have this problem."