There are a lot of scammers around here. I was an HVAC contractor for 38 years. My neighbor told me his HVAC company informed him that his evaporator coil was rusting and needed a treatment that cost nearly $1,000. or he would end up spending more thousands later. NONSENSE! Every evaporator coil that is a few years old has some sign of rust! The end panels are made of galvanized steel and they WILL rust. Don't spend lots of money without having someone else look at it. Mold is a great buzzword for them to get you to spend money too. Be sure that what they are showing you is not in fact dust. Return ducts that lead to a filter will always have dust in them, but remember if the ducts are before the filter, its not a big deal- the purpose of the filter is to catch that dust before it enters the air handler and before it ends up in the supply ducts..
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