Extremes of temperature can adversely affect employee's performance and in some cases cause them harm. Comfort is a subjective matter and Employers will need to deal with providing and maintaining reasonable thermal comfort with that fact in mind.

The temperature in workrooms should normally be at least 16 °C unless much of the work involves severe physical effort in which case the temperature should be at least 13 °C. These temperatures may not, however, ensure reasonable comfort, depending on other factors such as air movement and relative humidity.