Inspect your exterior walls, doors, and windows
Start with your siding. If wood, is paint starting to peel? Seams opening up? See any signs of cracking? Or mould? Has any wood gone soft? Focus in particular on your home’s north side, as that often is where issues first emerge. If you have brick or stucco, look for stains, cracks, or crumbling. Next, check your doors and windows for a tight seal, all the way around. Then check the wood for softness, mould, stains, or peeling paint.