Hi,
Sometimes the moisture at the air handler is from a clog drain and it backs up in side causing a mildew, wood rot problem. so we all need to flush and unclog the drain line with hot water and household bleach about every 3 to 6 months also a long the same lines is to drain your hot water heater a little PM gos a long way.
One of my son just had his water heater replaced $1200 for a 40 gal and $400 to unclog the drain yes he was ripped off and no he never did any PM on a 9 year old system
Da Sgt
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