Originally Posted by
Al Czervik
Does the 737 have cockpit climate issues?
No... the -700 is perfectly cold after 4 hours at FL400. Icebergs forming in my coffee about an hour later with total freeze over an hour after that.
The good news is during daytime operations, the heat of the sun keeps the temperature just right.
You get a wee better extra warmth with the -800 and even more with the -900 (non ER with 26k motors) since they can’t get above FL340 or FL350 fully with ISA +10 to +15