Yes, a dirty aircon can significantly affect the health of the people in the room, as mold, bacteria, dust mites, and other allergens that accumulate inside a neglected unit are continuously circulated into the indoor air every time the aircon operates. In a tropical country like the Philippines where windows are often kept closed while the aircon is running, the indoor air quality is almost entirely dependent on the cleanliness of the unit filtering and recirculating it. Regular exposure to contaminated aircon air can trigger or worsen allergic rhinitis, asthma, skin irritation, and respiratory infections, making proper and timely cleaning a health priority and not just a maintenance concern.