Is the cabin temperature set the same all year round? Ie- during winter in a Melbourne cold morning is it set at a higher temp? I always find cabin’s cold.
I find cabin temps hot. What to do with variable passenger demands?
The cabin temps are always selected to the same settings by the pilots. But…
First thing in the morning, the aircraft is just being woken up. So, it’s probably sat there all night, shut down. In the days before APU run time, or fuel use, became an issue, the APU might have been started up by the engineers a hour or more before the aircraft was due to be used. Now, that probably won’t happen until the pilots decide to start it. And that means that there won’t be any heating (or cooling) for any length of time prior to passenger boarding. In this circumstance, adjusting the target temperature does not help, but it does lead to much more uneven temps through the aircraft, until the system catches up…which it probably won’t do before engine start.
Some gates do provide air conditioning, but in general that’s all about cooling, and less so heating. Also not available at most places, especially in never hot or cold Australia.
The APU itself is not able to supply the amounts of air that the engines can, and so, even if it is used, it’s rarely as effective as even a single engine.
Doors. When the aircraft is parked, there’s almost always doors open. Not only do these bleed the conditioned air away, but in some aircraft they also inhibit the behaviour of the system.
The upshot is that the systems are designed to keep you reasonably comfortable when the engines are running and all doors are shut. At other times they almost always struggle.