Poorly maintained air conditioners and ventilation systems can cause serious health risks, such as respiratory problems, legionellosis (a serious pneumonia) and worsening of allergies. Legionella bacteria can accumulate in parts of air conditioners and ventilation systems, which can lead to contamination. Thousands of cases of legionellosis are reported each year, with several hundred deaths worldwide.

In addition, poor air quality in poorly maintained systems can lead to asthma, allergies and Sick Building Syndrome (SBS), where people experience headaches, fatigue and breathing problems. So it is important to perform regular maintenance to prevent health problems and risks.