I have a question about my AC system/attic/laundry room.
This is a new house built in 2019. Been living here for a year. I Noticed the laundry room has always been humid and figured it was because of the dryer. After finding mildew around a bedroom register, I decided to investigate the other ones.
This is the "second grille" in the laundry room As soon as you get near it you can feel warm, moist air coming down into the room. Taking off the grill reveals this, which is just a tube right into the attic. You can see part of a truss up there in the picture. Once I took the grille off, the warm air "pours" into the room even quicker and it is very humid air.
This is what the vent looks like as it comes into the attic. I didn't take this picture.. I found it on the internet. It's the exact same though.
And just to be sure, here is the actual AC vent in the same room, on the other side of the room. It has no mildew under it, but it does sweat insistently:
So what I originally thought was just humidity from the dryer is FOR CERTAIN coming from the attic. If I leave the doors to the laundry room close, it gets pretty mucky in there, even if the dryer/washer has not been running for more than a day.
Shouldn't warm air be going UP into the attic? Where would I even begin looking to get to the bottom of why warm/moist air is coming into the house from this one single vent?