Waking up to foggy, dripping RV windows is a common problem during cold weather. Condensation might look harmless, but over time it can lead to mold, mildew, and water damage inside your RV. The good news is that with a few simple tricks, you can stop condensation and keep your RV dry and comfortable all winter long.
Why Does Condensation Happen in an RV?
Condensation forms when warm, moist air inside your RV meets the cold glass of your windows. The water vapor turns into liquid and collects on the surface — especially at night when temperatures drop.
Common causes include:
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Cooking or showering without ventilation.
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Propane heaters adding moisture to the air.
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Poor insulation around windows or doors.
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Breathing (yes, even people and pets produce humidity).
How to Reduce and Stop Condensation
1. Ventilate Your RV Regularly
Even in winter, airflow is essential.
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Open a roof vent or window slightly to let humid air escape.
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Use vent covers so you can keep them open during rain or snow.
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Run your RV’s roof vent fan while cooking or showering.
2. Use a Dehumidifier
A small electric or rechargeable dehumidifier helps remove moisture from the air.
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Place one near the kitchen or sleeping area.
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For boondocking, try moisture-absorbing crystals like DampRid.
3. Switch to a Dry Heat Source
Propane heaters without external vents release moisture. Instead:
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Use a vented furnace, electric heater, or heat pump.
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Avoid using the stove or oven for heating — it adds humidity fast.
4. Improve Window Insulation
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Install thermal or double-pane RV windows if possible.
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Use insulating window film, foam boards, or thermal curtains.
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Magnetic or Velcro window covers work great for sleeping areas.
5. Wipe Windows Daily
If condensation does form, wipe it down each morning. Use a microfiber towel or squeegee to remove water before it drips into window seals or walls.
6. Control Interior Humidity
Try to keep indoor humidity between 30–50%.
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Limit indoor drying of clothes.
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Cover pans when cooking.
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Run the bathroom fan during and after showers.
Bonus Tip: Warm the Glass!
If you camp in freezing weather, even a small fan blowing gently across windows can help keep surfaces warm enough to prevent condensation.
Condensation is one of the most common winter RV issues, but with good ventilation, insulation, and humidity control, you can easily keep your windows dry and your RV comfortable.
For professional RV insulation upgrades, window replacement, and weatherproofing, contact Custom-way in Artesia, CA.
We specialize in RV remodeling, roof coating, and cold-weather prep to keep your rig ready for any season.
Call +1 840-205-7314 or email customway.ca@gmail.com today.