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Ever wonder why your windows fog in winter or why the attic sometimes grows frost like a walk-in freezer? We unpack the simple physics behind relative humidity and dew point, then connect those concepts to the real problems homeowners face: condensation on cold surfaces, mold risk in damp basements, and hidden moisture damage in poorly ventilated attics.

We start by making humidity intuitive, showing how warmer air carries more water vapor because it has more energy. From there, we explain dew point in plain language: the temperature where air can’t hold its water anymore and it condenses. That single idea explains the beads on a cold soda can, the musty smell in a basement, and the reason roof sheathing can frost over on the coldest nights. Along the way, we talk through ideal indoor humidity targets (40–50%), why anything at or above 60% invites mold growth, and how device settings can work against you.

You’ll hear our take on common mistakes like running a whole-house humidifier at 55% while a basement dehumidifier fights to hold 45%. We dig into regional realities, why basements and crawl spaces often need dedicated dehumidifiers, and how small leaks in furnace-mounted humidifiers can quietly corrode ductwork. We also map out practical fixes: seal ceiling penetrations, ensure clear soffit paths, add baffles, balance ridge ventilation, and insulate cold spots such as rim joists. The goal is simple—align temperature, moisture, and airflow so dew point happens outside, not on your framing.

If you want a home that feels comfortable, smells clean, and resists mold, this is your roadmap. Tune in for clear guidance, actionable settings, and the inspector insights we rely on during real home visits. If this helped you dial in your humidity, subscribe, share with a friend, and leave a quick review telling us your target RH and what you’ll adjust first.

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To learn more about Habitation Investigation, the Three-time Winner of the Best Home Inspection Company in the Midwest Plus the Winner of Consumer Choice Award for Columbus Ohio visit Home Inspection Columbus Ohio - Habitation Investigation (homeinspectionsinohio.com)

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