The lint was collecting humid air, which condensed the water.

I know here in the "lowcountry", where it's very hot and humid, buyers are pretty concerned about having a quality AC system.

just wondering what the ideal humidity is inside a home in winter time when the gas furnace eats up all moisture??

I also learned from this article that a pot farm can virtually ruin a house because of the humid (mold) environment required.

I own several properties in FL, where high humidity is the norm (unlike San Diego).

But if you visit the coastal Carolinas in the summer it can get miserably hot and humid.

Do not have any return ductwork from the bathroom, as that will pull the moist humid air from the bathroom into the HVAC system and this will be circulated through the ducts; there is risk of this moist air condensing within ductwork and potential for mold to develop.Installing exhaust fan(s) in the bathroom is sometimes a good idea too.

I'm not sure how well those are at keeping renters, nor am I sure how much maintenance needs to be done in such warm and humid places.

Two tests were done, one at 85% relative humidity (e.g., unconditioned space such as a garage) and one at 50% relative humidity (conditioned space).

It is around 86 to 90 (30-32 celsius) almost every day and humid.