Lets say a giant radioactive monster is attacking Phoenix. This monster is so radioactive and big the air in
Feels easily over 120°. Is this an endothermic or
exothermic reaction?

exothermic reaction

The monster is releasing heat energy to the environment surrounding it. The term "exo" means "outside".

In contrast, an endothermic reaction is one where energy is absorbed from the environment to cool down the surrounding air.

how to make a simple air condition

c. 75.7

i think that is the right