Overview

• Malfunctioning units can harbor Legionella, Aspergillus and other pathogens in stagnant water and contaminated filters, leading to respiratory infections from pneumonia to severe fungal disease.
• Occupants of poorly maintained air-conditioned spaces often experience headache, dizziness, nasal congestion, cough and fatigue that ease once they leave the building.
• Research shows that health risks in air-conditioned offices—such as reduced lung function and higher absenteeism—stem largely from maintenance failures rather than cooling itself.
• Routine cleaning of filters, prompt drainage of water trays and keeping indoor humidity above 40% are critical steps to disrupt microbial growth and improve air quality.
• Hospitals and facilities with immunocompromised patients face elevated dangers and must follow stricter HVAC upkeep protocols to prevent bacterial and fungal outbreaks.