In the movie Dune, there is a lot of emphasis on how dry and sandy Arrakis is. However, isn't Arrakis supposed to be very hot? I mean, this is the main reason the Freman supposedly prefer to move outside during the night instead of the day. While watching the movie, I noticed that in every scene outside you never got the feeling that Arrakis has this hellish hot planet. After the movie I asked my daughter who has never read the book or learn about the story before, if she thought Arrakis was hot or not and based on the movie, she didn't get the impression that it was a hot place.
Edit: Indeed, it seems that in the appendix I, the book says it was a very hot place. "Kynes and his people turned their attention from these great relationships and focused now on micro-ecology. First, the climate: the sand surface often reached temperatures of 344° to 350° (absolute). A foot below ground it might be 55° cooler; a foot above ground, 25° cooler. Leaves or black shade could provide another 18° of cooling."