That was never ever enforced at LCAL, we were ALWAYS told to put passenger comfort ahead. They had a big push to reduce APU usage as we leased the APU per hour, every minute was around .99c cost. It was clearly stated over and over to reduce usage when practical but always always always put pass comfort ahead. Some guys, and a real minority could not get that in their heads and would shut it down. I recently deadheaded to Panama City and the Captain left us all roasting, the whole crew shares the van so he had to wait for us on the other side anyway, surprise he was a SCAB, I think that's the root of it, those guys don't consider anyone but themselves in any aspect of their lives. But CAL management never in any way encouraged that or would say a word to a pilot for APU usage.