All it takes is a four hour power outage to throw people into the bowels of hell. That's how long perishables stay good in the fridge. 4 hours. Most of us have no idea how to exist without electricity. But that's what happens in heat waves. People crank up the air conditioning until the power grid can't handle it and fails. That's probably the biggest thing we need to know. How to not die of heat without killing the power grid.