Originally Posted by
StuckInYYZ
those that sit near the exits tend to be shivering a lot even under two or more blankets due to the air leakage
It's not air leakage. If any air leaks, it is cabin air leaking out. The cold outside air can't leak into the pressurized cabin anymore than water can leak up a waterfall.
It is cold around exits and doors because the doors cause breaks in the insulation and the materials around the area lose heat more quickly via conduction creating a colder interior wall.