Preventing Heatstroke in Warehouses: A Comprehensive Guide for EHS Managers

In a warehouse, summer heat isn't managed; it's prevented. A logistics operator collapsing on the loading dock means a workplace accident, an investigation by CARSAT (French regional health and safety insurance fund), and potentially criminal charges for the employer. This guide provides the regulatory basics, thresholds to monitor, and equipment that truly makes a difference.

Why the Warehouse is the Most Dangerous Environment During a Heatwave

Unlike an office, a warehouse combines all aggravating factors:

Intense physical labor — order picking, handling, carrying loads: internal heat production is 5 to 7 times higher than for a sedentary employee
Large unairconditioned spaces — metal or fiber cement roofs accumulate solar heat and radiate it at night: the warehouse can remain at 35 °C at 10 PM
Limited airflow — airlock doors, enclosed docks, and dense shelving block natural ventilation
Restrictive PPE — gloves, safety shoes, fluorescent safety vests: each layer of clothing increases the perceived temperature
Maintained production pace — picking and shipping targets don't stop because it's 38 °C outside

⚠️ Regulatory Reminder — Article R4225-1 of the French Labor Code
The employer is required to take necessary measures to ensure the safety and protect the physical and mental health of workers in the face of extreme climatic risks. During a heatwave, the absence of documented preventive measures constitutes an inexcusable fault in the event of an accident.

Essential Risk Thresholds to Know

Ambient Temperature	Risk Level	Mandatory Measures
30–33 °C	⚠️ Vigilance	Increased hydration, additional breaks, monitoring of isolated operators
33–36 °C	🔴 High Risk	Team rotation, mandatory cool-down areas, active ventilation, cessation of heavy tasks during hottest hours
> 36 °C	🚨 Immediate Danger	Activity reassessment, possibility of exercising right to withdraw from work, alert occupational physician

Note: these thresholds are indicative. Perceived temperature (humidity + radiation + physical effort) can be 5 to 8 °C higher than the measured ambient temperature.

The 5 Indispensable EHS Equipment Items for a Warehouse in a Heatwave

1. Industrial Misting Fans

A simple fan moves hot air. A misting fan lowers the perceived temperature by 6 to 10 °C by creating a comfort zone around workstations. Essential on loading docks and in picking areas.

2. Rechargeable Neck Fans for Mobile Operators

An operator who walks 15 km a day through aisles cannot stay in front of a stationary fan. A wireless neck fan provides continuous airflow to sweating areas (neck, throat) without restricting their hands. Rechargeable via USB-C, it lasts 8 to 12 hours on a single charge.

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3. High-Capacity Portable Misters

To be placed in break areas: warehouse entrance, rest room, changing room area. A portable mister with a 300–500 ml reservoir allows continuous diffusion without water network connection.

4. Phase Change Cooling Vests

For managers and team leaders who need to circulate continuously in the warehouse. PCM (Phase Change Material) inserts maintain a surface temperature of 15–18 °C for 2 to 4 hours.

5. Additional Fresh Water Fountains

Regulations require 1 water point per work area. During a heatwave, double the access points and ensure water is 10–15 °C (neither icy nor warm). The goal: 500 ml every 30 minutes per employee engaged in physical activity.

The 7-Step Heatwave EHS Action Plan

Appoint a heatwave referent — an EHS team member with decision-making power over work organization
Install thermometers in at-risk areas — dock, high picking area, packing area — readings every 2 hours during a red alert
Plan for schedule adjustments — start earlier at 6 AM, block heavy tasks between 12 PM and 4 PM
Build a stock of thermal personal protective equipment — neck fans, misters, breathable technical clothing
Train local managers — recognize signs of heatstroke: dry red skin, confusion, hyperthermia > 40 °C
Document all measures taken — update the Single Document for Occupational Risk Assessment (DUERP) before summer
Establish an emergency procedure — who calls 15 (emergency services)? Where is the emergency cooling kit (cold water, wet towel, fan)?

Recognizing and Reacting to Heatstroke

The difference between heat exhaustion and heatstroke is a life-threatening emergency:

Signs	Heat Exhaustion	Heatstroke ⚠️
Skin	Pale, clammy	Red, dry, hot
Temperature	< 40 °C	> 40 °C
Consciousness	Normal but weak	Confusion, agitation
Action	Cool area, hydration	IMMEDIATE CALL TO 15 (emergency services) + active cooling

Downloadable Checklist — Warehouse Heatwave

☐ Thermometers positioned and tested in all zones
☐ Stock of fresh water (calculation: 500 ml × number of employees × number of hours)
☐ Industrial fans in place at critical workstations
☐ Neck fans ordered for mobile operators
☐ Schedules adjusted (start 6 AM, extended break 12 PM–4 PM)
☐ Heatwave referent designated and trained
☐ DUERP updated with thermal risk section
☐ Emergency procedure posted in each work zone
☐ SAMU (French emergency medical service) number posted next to the emergency cooling kit