The word(s) "heat" appears 16 time(s) in 15 verse(s) in Quran in Muhammad Pickthal translation.

(11) Endure the heat thereof, and whether ye are patient of it or impatient of it is all one for you. Ye are only being paid for what ye used to do.

(12) Wherein are fruit and sheathed palm-trees,

(13) There will be sent, against you both, heat of fire and flash of brass, and ye will not escape.

(14) Hast thou not observed those who were forbidden conspiracy and afterward returned to that which they had been forbidden, and (now) conspire together for crime and wrongdoing and disobedience toward the messenger? And when they come unto thee they greet thee with a greeting wherewith Allah greeteth thee not, and say within themselves: Why should Allah punish us for what we say? Hell will suffice them; they will feel the heat thereof - a hapless journey's end!

(15) Reclining therein upon couches, they will find there neither (heat of) a sun nor bitter cold.