I've also sent this out, but this is PARTICULARLY RELEVANT TO both the last week in Europe, AND the next week in the Eastern US. (surprisingly, not yet deleted -- I've already got it archived on the archive sites)
PNNL: Creating a Cool Room for Extreme Heat Events
"...Given the reality of global climate change and the increasing likelihood of extreme heat events, designing and retrofitting homes for resistance to extreme heat and power outages should be considered in all climates. Extending the "hours of safety" that a home can provide when air-conditioning is not available can be life-saving. However, it is not necessary for an entire home to be resistant to extreme heat. Instead, the design or retrofit can concentrate on just one room. When full-home-scale measures with backup power are cost-prohibitive, impractical, or not appropriate for the climate, a cool room can be a cost-effective and sensible approach...."
(US government website)
https://basc.pnnl.gov/resource-guides/creating-cool-room-extreme-heat-events#edit-group-description
