Making houses less draughty is just one point (convective heat transfer) another point is making walls conduct heat less to reduce conductive heat transfer. Un

Making houses less draughty is just one point (convective heat transfer) another point is making walls conduct heat less to reduce conductive heat transfer. Uninsulated houses often has higher risk to mold because of cold walls. Warmer air has a higher capacity to carry water as humidity. When it hits cold walls the air cools down and the water condensates leading to mold.