My Son Suffers From Seasonal Cold. He Is 6 Now.

My son suffers from seasonal cold. he is 6 now. he can handle extreme cold climates but the moment the weather changes he begins to cough. his doctors has put him on huff puff. but that didn't help much. we give him nebuliser 4 doses of Doulin 0.5 mg and 2 doses of bodecort 0.5 mg. for how long are we supposed to carry this on. im not sure if he has astahma. but if he ds . is there a cure for it.