RV Condensation: Keep Windows and Hidden Corners Dry
Wet windows after a cold night do not automatically mean your RV has a failed seal. RV Condensation forms when moisture in the air meets a surface cold enough for that moisture to collect as water. Cooking, showering and even breathing supply the moisture.
At Basecamp RV, we recommend starting with the pattern: when does the water appear, and where does it show up first? Those observations help you decide whether to improve ventilation or investigate water entry.
Start Your RV Condensation Checks With a Humidity Reading
A small hygrometer makes moisture control easier to judge. Put it in the living area away from the stove, shower spray and direct heater airflow. Record a reading before bed and another in the morning, along with whether the windows are wet.
Winnebago recommends keeping relative humidity at 60% or less. Treat that as an upper guideline, not a guarantee of dry glass: a very cold window can still collect condensation. If surfaces stay wet, reduce moisture further and watch how they respond.
Remove Steam While You Are Making It
Run the bathroom exhaust fan while showering, with its vent open as designed, and continue ventilating afterward until the room dries. Use an externally vented range hood while cooking. A recirculating fan cannot carry water vapor outside.
Crack an appropriate window or roof vent to provide ventilation. Follow your coach and fan instructions, especially in rain or freezing conditions. Some heat will leave with the moist air, but sealing the RV tightly while generating steam lets that moisture collect elsewhere.
Check Behind the Things That Hide Moisture
Look inside wardrobes, behind cushions against exterior walls and beneath the mattress. Restricted airflow can leave these areas damp even when the middle of the room feels comfortable. Avoid packing storage spaces so tightly that air cannot circulate.
Lift bedding and move accessible cushions to inspect the surfaces underneath. Dry wet materials before putting them back. If a spot repeatedly becomes damp, photograph it and note the weather and indoor humidity rather than hiding it beneath another layer.
Use Fans and Dehumidifiers for Different Jobs
A circulation fan moves air around the room. An exhaust fan moves moist air outside. A dehumidifier collects moisture from the air. Choose the tool for the problem instead of assuming any running fan is drying the coach.
If you use a dehumidifier, follow its room-temperature limits, provide the specified clearance and empty its collection tank. Compare the humidity readings and the same problem surfaces over several similar nights. A machine running continuously without improving either is a reason to reassess the setup.
Do Not Explain Away a Persistent Leak
Widespread droplets after sleeping or showering are a useful condensation clue. One recurring wet corner after rain deserves a separate investigation. Neither pattern proves the cause, and condensation and a leak can exist together.
Wipe up water, record where it first appeared and inspect accessible trim for staining or swelling. Do not add caulk simply because a window is wet. For exterior seams, our roof-inspection guide explains what separation and lifted sealant look like.
Start with a humidity reading, remove steam at its source and inspect the concealed surfaces. The goal is a coach that stays dry, including the places you cannot see from the dinette.
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