Three times over the last 12 years I have had a chronic cough. The first developed after a trip to LA. The motel we stayed in had an old air-conditioner in it. The cough lasted about 6 months. 4 years later we had a trip to Europe. The airconditioning in the bus we travelled on for 21 days affected me. After 12 or so days a cough developed and lasted 4-5 months. I have the cough again now. It could be related to the airconditioning at work. The cough is non productive. This time it is a croup type cough. Has anyone had these problems. Any remedies anyone knows of?