How to use AC(Air Conditioner) in summer? I work in IT and sit all day in AC for 8 How to use AC(Air Conditioner) in summer hrs. When i go back home, my bed room is so hot. When i switch on the ceiling fan, all the heat from the roof comes down making room even more hotter. If i sleep without switching on AC, i get sweat. If i switch on AC for sometime and then switch off, even then i get sweat at night and wake up. For this reasons, i switch on AC and leave it running till morning. (approx 8hrs) So if i am under AC for like 16hrs, 1. What are the health issues that will come if i sleep under AC? 2. What should i cover when i sleep under AC? 3. What is the simple treatment for AC allergy? Who can help me on this??? P.S i am suffering from AC allergy.