If it's 100 degrees out, will he sweat/get hot?

I'm doing research for an rpg and was wondering if Iceman's abilities mean that he doesn't experience heat or what?

Does he/can he get cold if its super cold out?

Can he make himself cold to stop himself from sweating or will that make the heat worse for him?

^-^

Anybody?

he has become immune to heat.

Not if he doesn't want to,  he has complete control over temperature.  There is a scan floating around out there where he's standing near some huge fire and talking about how he's as cool as a daisy because heat only flows along gradients he chooses....something like that.