upstairs condensation inside

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Is it in one spot, like near a ceiling attic entrance? Or all over?

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A few spots are worse than others but it’s all over. Upstairs is a 16x16 room and an adjacent loft.

Sounds like it could be a sealing issue - an air gap - where the top of the gypsum board wall, joins (butts up against) the ceiling gypsum board - of course that is covered by the molding. Hot humid air from the attic, seeping through the gap, hitting the cooler, drier air in the room, and condensation forming.

You’d have to check from the attic side, moving away the attic insulation, which I’m guessing is blown in insulation. Remember this, fiberglass insulation is a thermal barrier, not a vapor barrier.

Also remember this law of thermodynamics - “heat chases cold” (meaning hot air from the attic will move to the cooler conditioned area below) and “wet chases dry” (meaning air with high moisture content like the attic will move to the drier air conditioned air below).

This is a pretty common problem around HVAC supply registers, with ducts in the attic, where the supply register boots at the ceilingj in the attic are not properly air sealed and insulated.

It is where I’d start my investigation. First time you’ve ever noticed this?

Seems like this attic door tent might help: LINK

Make sure you fix it. The walls in my house got royally fricked up from this exact problem when I added a mini split and dropped the temperature a bucn. It was becasue the insulation wasnt quite all tbe way to the soffit in the attic, and hot wet air was getting behind the crown molding and condensation was forming on the tops of the paneling

It was old paneling, and its still screwed up. I havent fixed it yet. Its all dried out now, but it will need to be replaced or covered up.

Eta: also, have the wife not set the thermostat to 65 when its 99 and humid af outside in a 50 year old house after you add a gazillion horsepower of cooling to it. It was ok when I had 1.5 tons of cooking. Now I have 4.5 of variable speed cooling, and you could destroy the house with it if you wanted to.

Any recommendations on what type of company to contact? Roofer, insulation company, A/C people, general contractor???

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Any recommendations on what type of company to contact?

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Sorry for the delay, I lost track of this thread. I would just get some kind of handyman. That type of person could seal up any gaps in your drywall under the molding.