Are there climates or facility types that are most prone to humidification problems, and consequently, IAQ issues?
MUMMA: In arid climates, and those with a month or more where the outside air temperatures drop below about 30°F, good humidification is more critical. Otherwise, the introduction of significant quantities of dry outdoor air can lead to spaces with single-digit relative humidity, which can negatively affect all types of facilities. LENTZ: It’s important to note that there is not necessarily a direct connection between providing humidification and IAQ issues. Actually, there are many facilities that have never been equipped with humidification systems that provide environments proven to be quite acceptable to the occupants. This is particularly true as one moves toward milder climates. The IAQ issue is more often associated with conditions of inadequate humidity control, such as excessive humidity levels that can produce moisture condensation inside wall or roof systems. In the southeastern U.S., we see these conditions more during hot and humid weather. In the north, IAQ problems resul
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