I have a new home < 1 year old.
The summer humidity level, in my walkout basement, is running 70%. My builder is telling me thats normal. I'm thinking with a 13 Seer/94 AFUE system, if the air was circulated properly the humidity wouldn't be this high. The builder is telling me I need to get a portable de-humidifier unit. I didn't build a new house EVER expecting to need one.
Ps Have not talked with the HVAC installers yet.