I was trying to sleep in Bangkok 2 years ago, the night temperature at 11 PM was 30C, I read books by a led bed lamp, had electric fans on, listened to cool Thai classical music, sipped iced tea. I learned to see that feeling (vedanaa) [of a ruupa -- temparature] had overcome every other khandhas. Though I recognized full well that it was only temparature, I still thought up many other ways to cool down. I had my mind filled up with "dosa, lobha, and moha" for many hours that night. I moved to a country town next day.

I still wonder what is the "sum of all people's suffering from mere temperature night after night"? What possible akusala kammas they may do?

Heat is real (dukkha)!