There's a musty smell upstairs and I can't find where it's coming from.
Coastal houses breathe damp air — even well-built ones. A musty smell almost always means moisture somewhere it shouldn't be, and mold growing on a surface you can't see. Sometimes it's in the bathroom fan ducting, sometimes in the attic, sometimes inside a wall cavity. We'll find it.
We'd start with · Visual inspection + air sample if needed