No company requirement - pilot discretion.
Personally ... (my first time operating in fairly nippy conditions) stepping onboard a cold soaked aircraft first up is APU on (if it isn't already), logs and cabin inspection (by then 1 minute is up), left pack on high and go for a walkaround. Get back, cockpit and fwd cabin is peachy (fwd cabin FA's are happy ... very important
), left pack off and right pack on - warm up the rest of the world and it's now quiet enough to think (less noise coming in from #1 FWD Entry)
