before you write us all off...
try what teddy bear suggests:
Operate you fan "on" mode for a couple days to test "the condensation in the ducts" theroy.
personally...I'm not sure about that, but would be interested in what you find out. as teddy bear
says..its a learning experience.
better to resolve what is happening than to live with it...right?
investing a week of your time may provide a solution to your RH issues.
living in the south...I've seen the issues caused by the whole chinese drywall fiasco.
corrosion of copper in electrical, hvac causing homes to be re-wired, hvac system completly
changed out...breathing issues. its nothing to make light of.
keeping the thread on track is always difficult. so just ignore what doesn't apply & use
could help you. insulting homeowners is not the intent of this forum.
best of luck
The cure of the part should not be attempted without the cure of the whole. ~Plato