The comparison is based on the thermal sensation you would experience at a constant dewpoint of approximately 55 degrees. In addition to thermal sensation, heat stress categories have been developed based on apparent temperatures. Fatigue is possible with prolonged exposure or physical activity, or a combination of the two, in category IV weather. The most severe category is I, which is an apparent temperature of 130 degrees or higher. Back to Top 2.
Condensation leads to mildew and musty odors.
Assuming the basement air temperature is 80 degrees, relative humidity must be 70 percent or lower to prevent condensation. Reducing humidity to 60 percent or less will prevent condensation on cold water pipes. If the basement is used as living space, you will want to maintain a relative humidity of 55 percent or less for optimum comfort. Back to Top 3. One disadvantage of living in the city is that it is always a few degrees hotter in the summer than the adjacent countryside.