From the bloggers at Do It Yourself RV.
Proper ventilation provides maximum comfort in your RV, and also reduces the risk of damaging condensation and mold. During the heat of summer, you’ll probably need to use your A/C. In cool months, a central heating system is a must. For those in between times, finding the right balance can be hard.
For recently-built campers, a roof vent large enough to double as an emergency exit is standard equipment. Often these vents have integrated fans in them, like those made by Fan-Tastic. What about older campers that might not have a large, working ceiling fan?
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