I worked at a warehouse once with a boiler that worked 40% of the time. We had below 0 degrees F once during a bad storm and we had high 90s in summers. Glad I left before the super El nino heat and glad I don't have that work environment anymore. To be fair it's probably also not the worst. Metal smelting plants probably can go 120+ easy.
California to become third state to mandate heat protections for indoor workers ( www.nbcnews.com )