Atleast according to Kachelmann, a german weather reported with some controversy behind him, stated that most heat-related deaths could have been prevented if m

Atleast according to Kachelmann, a german weather reported with some controversy behind him, stated that most heat-related deaths could have been prevented if moisture had been lower; if people who only vent during the night would pull in extra moisture and just make it hard on them. He recommends to always leave the window open so fresh air can move in and out. (Note that this is in germany, we don't have regular AC so leaving your window open or tilting it is the only option) But yeah, at WBT 35°C you're going to start running into thermal problems. At that point your best bet is lots of cold water (careful you don't overhydrate, that's equally dangerous as dehydration in the heat), that can probably push you to 37C WBT. But beyond that it's basically a race against stress shutdown of your body to get some effective method of cooling going.