DSE equipment and light sources discharge a certain amount of heat. Work areas should be well ventilated, kept at a comfortable temperature and free of draughts so as to avoid fatigue or discomfort.

For comfort indoors, the following guidelines may be applied to sedentary work, which involves little or no manual effort: at 18 to 24 degrees Celsius the relative humidity can fluctuate between 30% and 70% without creating thermal discomfort