 [ Symptoms ] sitting in front of a window unit cause sniffles how long will they last when you move away from the front of the unit [ Disease ] it would only cause sniffles if those sniffles were to do environmental allergies like pollens or molds allergies can last a long long time so it would not be possible to make a general prediction on the duration of symptoms cold breezes open windows will not cause colds colds are caused by viruses and viruses last about a week