A close friend of mine is an engineer at a major airline & they performed a study in which they took temperature readings at regular intervals over the course of 50+ hours on transcontinental flights. During each flight, they recorded temps of mid 20’s to mid 30’s in multiple locations around the cockpit. In line with posts by the commenters on this thread, the coldest readings were observed after about 2.5 hours of flight at the pilots legs/feet. Makes for an uncomfortable contrast of temps between upper body/lower body.

Just wondering what, if anything, pilots are doing to cope with these temps for hours at a time?