I dunno, it just doesn't seem that difficult to keep the passengers comfortable. This PROBABLY isn't even a case of conductor problem. there is probably some rule that says the doors should be opened to speed the boarding/disembarking processes to keep the train on schedule.
BUT if I were king of SEPTA, here is how it would work for SL IVs.
Conductors can open/close the vestibule doors to the outside and set up the steps/platform rigging for the appropriate level.
BUT for the door from passenger compartment to the vestibule, if they MUST open a door, just open one. Most preferable, the door opposite the direction of travel (i.e. if travelling north, just open the south door on each car. This accomplishes not giving air an open path from front to back to freely travel each time momentum changes (breaking/accelerating). The passengers at the closed door side will just have to rough it and lift a finger
and open the door.
For me? I know we could never train SEPTA folks to do this consistently. SO, I choose to ride in the front or back car of a train. They never open both doors of those cars (except on rare occasions of an energetic conductor on a ride where they are not taxed for time - i.e. frequent stops with platform/non platform level stations and lots of cash paying customers they have to punch out tickets for . . .). I know its not as easy as it looks running back and forth setting up doors AND taking care of tix, so I don't complain too loudly. But just leaving one passenger/vestibule door closed in each car would really help, and it doesn't consume time.
Why leave the door on side of car that is same side of direction of travel closed? Well some of the door latches don't grab that easy. Breaking time is usually the biggest change in momentum over shortest period of time. That kind of force can swing an unlatched door open, or push a door closed.
IF the opposite door configuration was made, the 'front' door would be open already, and the 'back' door that is possibly unlatched can be pushed open by change in momentum and air pressure from change in momentum, and that would end up with both 'front' and 'back' doors open, and nothing would be accomplished. Of course, next issue is the latch that keeps the open door open. Upon leaving the station we all hear the click, but, some of the latches don't let go of the door anyway, so, this all may be for nothing
if you are in one of THOSE cars. SL IV cars are pretty good though, for that mechanism being functional most of the time.