text:  There's conditioned crawl spaces. There's unconditioned crawl spaces. But in general, there's a hole that's dug in the soil. Concrete footings are placed. The concrete stem walls are placed. Then the plastic vapor barrier or some other type of thing goes on the surface of the dirt to keep moisture from coming up. The walls may be insulated. The floors may be insulated. Depending how the system is designed, there may be ventilation in the crawl space. There may be...