Minister of the future intro about a heat bubble gave me nightmares. It make me think about how we could prevent death in case of a massive humid heat wave, an

Minister of the future intro about a heat bubble gave me nightmares. It make me think about how we could prevent death in case of a massive humid heat wave, and how we could do it at a low enough cost, especially in a situation where the grid fail. My best guess will be some tent with high isolation fabric (think emergency blanket) cooled with a tank of liquid nitrogen.