A crawl space installed under the house can make the home colder in the winter than a house built on a concrete slab. Mold and mildew are the common problems in a crawl space, so you need to guard your home against that as well. In order to keep the floors warmer and prevent mold and mildew from growing in the crawl space, requires installation of crawl space insulation. The insulation seals out drafts and prevents warm air from escaping out through the space. It is an efficient way to deal with the part of the house that is prone to dampness.