let's say you had a digital thermometer on your wall that says the current temperature in your room, you step out of your room, a Fire Type Pokémon uses Heat Wave in your room, then you step back in... what would your thermometer say in Fahrenheit? how would it feel? what temperature would your room be after the Heat Wave attack, in spring, in summer, in fall, in winter, with AC on, with heat furnace on?
OMG! If any Pokémon used Heat Wave in my room, it'd take the temperature to at least 135F, probably past 150F in the middle of the summer-and that's a conservative estimate! If the Pokémon was powerful enough, it might burn the whole house down.