Maintaining relative humidity in the proper range can prevent occupant complaints and condensation issues on building finishes. High relative humidity can cause discomfort and can also Suggested Lead to condensation and mold growth within buildings. Low relative humidity causes dryness and is a common indoor air quality complaint during winter months.

As per ASHRAE’s Epidemic Task Force, Building Readiness Guide, maintaining the space relative humidity between 40% and 60% decreases the bioburden of infectious particles in the space and decreases the infectivity of many viruses in the air. Some regions recommend humidity levels are maintained between 30% to 50%.