Check duct work Homeowner concerned with a stain on ceiling. Stain is not below either air handler or condensate line. I checked all ductwork in the area. I could not find any wet insulation. There is a damaged duct that would need to be replaced bit it is not the cause of the stain. There is staining on the underside of the roof where a water leak was. I cannot confirm if it is actively leaking as everything is dry. The roof was replaced in the last few years. Home owner will have a roofer come look at it. Office to quote a duct replacement. 1 bag 10in indoor flex duct. 2 6 in collars. Mastic, tape. 1 hour labor. Current duct is not sealed with mastic. Home owner would like a quote on insulation. We will need to set an appointment for me to return on or after November 21st.