If the risk of heat stress is increased, additional acclimatization will be required. Always drink plenty of water when in the heat. Simply relying on feeling thirsty will not ensure adequate hydration. To replace the four to eight quarts of sweat that may be produced in hot environments, people require one-half to one cup of water every 20 minutes of the workday. Water at 55 F is preferable to ice water or warm water.
Physical fitness is extremely important.
The rate of acclimatization is a function of how physically fit the individual is. The unfit worker takes 50 percent longer to acclimate than one who is fit. Limit exposure time. Employ additional help or increase mechanical assistance if possible. Take rest breaks at frequent, regular intervals, preferably in a cool environment sheltered from direct sunlight.