Thanks for the replies
Tried today: Removed cover plate for air handler, sprayed coils( Looked clean to start with) Collection tray was clean, Poured some water in the collection tray and it ran free and clear to outside drain, also poured a few quarts of hot water and vinegar down the drain tee and it ran strongly to the outside. Removed permanent electrostatic air filter which was clean. Felt down inside the air return box, it was dry, no leaks. Both UV lights working. Sprayed the air filter and return air box and all reachable surfaces with some odor killer suggested by Lowes plumbing associate. I climbed up a step ladder and peered back through the attic (80 year old man here) Ductwork looked ok but can't get up to see the back of the house. I guess the suggestion of a visual duct inspection is necessary. Any suggestions on a company to use?
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