Very common issue here in the south. Mildew and such grows in the coil and the heat cooks the stink out. Regular cleaning of the evaporator usually curbs it, but we use a product that's literally called 'DirtySox' and it does a fantastic job of getting rid of it. UV lights certainly help, but you have to be very careful how it's installed as they can damage ALL plastic in view of the bulb, eat holes right through airfilters and ruin insulation!
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