Best Practices10 min readJanuary 2026
Worker Heat Acclimatization: The Complete 14-Day Protocol Guide
How to properly implement the OSHA-required 14-day heat acclimatization protocol for new and returning workers.
What is Heat Acclimatization?
Acclimatization is the physiological process of the body adapting to heat exposure. It takes time—typically 7 to 14 days.
The 14-Day Rule
For new workers or those returning from a week-long break, OSHA mandates a gradual increase in workload.
The Schedule
- Day 1: 20% exposure
- Day 2: 40% exposure
- Day 3: 60% exposure
- Day 4: 80% exposure
- Day 5+: 100% full duty (with monitoring)
HeatShield PRO automates this tracking ensuring no worker is pushed too hard too soon.
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