Sometimes Cyclops powers seem to generate heat, like when he sliced that Krakoa clone in half and the half still there was red hot. Or when he did the GOML blast and the trees were blackened. But since his blasts have always been purely concussive force, either it's artist error, or mass amounts of friction which superheat anything not blown away.
But still, the amount of fire the really powerful god-like characters like Surtur can put out(rival of Odin) dwarf's the others.