My friend in Alaska switched to wool after his foam insulation trapped moisture and caused rust. Wool doesn't just stop condensation, it actually pulls moisture away from the metal and releases it outside. This means the van's frame stays drier over time, which can prevent long-term damage like corrosion. I've been using wool in my van for two years now, and even in humid climates, the interior feels fresh. Plus, wool is naturally fire-resistant and handles temperature swings better than rigid foam.