Why it matters to you
Charleston summer dew points often sit in the 70s, so any surface cooler than that — a duct in a crawlspace, a supply register, a cold window — can sweat and grow mold. The EPA advises keeping indoor relative humidity below 60 percent, ideally between 30 and 50 percent, to limit mold growth.
Practical guidance
Keep a hygrometer in your main living area and watch the trend, not a single reading. Sweating ducts, damp floors, or musty closets mean moisture is winning; ask for an inspection that checks system sizing, duct insulation, and crawlspace moisture.
