Hello - I'm hopeful someone can offer advice. We purchased this house three months ago - it is approx. 60 years old, galvanized/metal duct work was probably installed in the mid 60s. The HVAC unit itself (Carrier A/C - Furnace combo) is probably 3-5 years old and includes a UV light system that is located at the return according to the A/C tech sent by the home warranty company.
Approx. 6 weeks ago we noticed mold growth on the grill in the downstairs bathroom. We returned from one-week vacation at the end of June and mold is now on almost all of the grills although not as bad as what is in the bathroom (temp on A/C was 80 degrees while we were gone if that makes any difference). The A/C tech sent by the home warranty company says that the unit is in fine shape and that he suspected mold in the duct work. The home warranty says such work is considered routine maintenance and is not covered.
We called 2 duct cleaning companies - both reps said we have mold in duct work (neither removed even 1 grill) and offered to clean the duct work for between $700-850 using vacuum/big brush method that is described on EPA/NADCA websites (I apologize for my simplistic terms). Both said they would use Fosters 40-20 on all insulated areas - the first company said they would fog with Fosters 40-80 into clean ducts.
What is a good course of action? What additional questions should I be asking? Is cleaning of ducts necessary?
Thanks for any advice that can be offered!
Catherine in New Orleans