Summarizes a study quantifying the impact of ultraviolet irradiation in the C band (UVC) on evaporator coil disinfection of California K-12 Schools, with the goal to determine if UVC is effective in reducing mold and mildew in HVAC systems, thereby improving airflow, indoor environmental quality, energy savings, and attendance. The study concluded that the UVC technology is effective in reducing microbial growth on air conditioning cooling coils. Since microbial activity is correlated with the amount of moisture present, the more humid the climate, the more applicable this technology. Additionally, this technology is more applicable in regions with high annual cooling hours, or inland climate zones, where the potential for mold growth is greater. The study team could not conclusively determine if there were any improvements in air flow or efficiency of the air conditioning units with UVC disinfection systems.
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