As another heatwave reaches the UK, it is worth asking an uncomfortable question: is there any positive side to extreme heat? The answer is not that heatwaves are good. They are not. They put pressure on people’s health, homes, schools, transport and the electricity grid. The UK Health Security Agency estimated 1,504 heat-associated deaths in England during five heat episodes in summer 2025. The official advisory Climate Change Committee has also warned that 92% of existing UK homes could be at