HOME! Home at last! The idea is, since it's generally -50C or so at altitude, having AC isn't such a big deal. This being the thought process of the the office ijits that book the trips. And to that I have to reply, you're right, for the 1 to 2 hours that the airplane is flying up there, heat is not an issue. But the 4 or 5 hours we spend ON THE GROUND waiting for the trip to either start or end, it sure as shit does.
Moab, UT temperature at take off - 103F
Tulsa, OK temperature at take off - 97F
Birmingham, AL temp at take off - 92F
That's outside folks. Sitting in the cockpit is exactly like sitting in a car in the sun without AC. I didn't have a thermometer with me. But my bathroom scale says I lost 7lbs today.
Now, for your moment of Cloud Zen.