How long does AC sickness last?

"Air conditioner sickness"—often characterized by cold-like symptoms, sinus irritation, scratchy throat, headaches, fatigue, and dry skin resulting from spending extended time in heavily air-conditioned spaces—typically resolves within twenty-four to forty-eight hours once you remove yourself from the trigger environment and rehydrate. These symptoms are frequently caused by breathing dry, recirculated air that irritates mucous membranes, or by exposure to mold, bacteria, dust mites, and fungal spores breeding inside damp AC evaporator coils or dirty cabin air filters. If symptoms stem from mild dehydration or dryness, resting in a well-ventilated natural airflow room clears discomfort quickly. However, if symptoms persist or involve severe respiratory illness like Legionnaires' disease from contaminated systems, medical treatment is necessary. You can verify recovery when symptoms subside.