Preventing the growth of mildew requires a balance between moisture and temperature either in such a way that minimal moisture is available in the air and the air temperature is low enough to inhibit growth (at or below 70 Farad without causing condensation to occur, or in such a way that warmer air temperatures, without an actual change in the amount of water vapor in that air, is by its nature "drier" (has a lower relative humidity) than cooler air and will tend to inhibit mildew growth in this way .