The rig on his chest allows him to control what temperature he wants in his suit, that's why he's able to handle the cold Hoth, damp planets like Kaashyk, and hellholes like Tatooine and Mustafar.
I like to think Palpatine specifically ordered the designer of his suit to make it so it has no ventilation and sprinkling minor inconveniences like that through his life to make Vader hate him even more.
