What safelife said. BUT........
We all perceive temperature differently. What is hot for one person can be cool for another. In offices I've sometimes found people complaining they are cold when I'm OK.
If you went through a plane and asked everyone about the temperature I reckon you'd get a wide range of answers from "freezing" to "roasting". Whilst the answers might be related to where the passenger is seated that would not be the only criteria affecting the answers.