Originally Posted by supcom
In very hot weather, an extended rest in air conditioned space can help the body recover from early stages of heat exhaustion. The cooler temperatures will allow the body core temp to lower and you may be able to take on more fluid to rehydrate if you stop longer than 10 minutes.
I've had to do this on some solo centuries when it was sunny, the teperature was >95F and the humidity was 85-90%. You start seeing spots and slowing way down, get some A/C or at least some shade fast.