If your home is elevated off the ground, there are high chances it contains a crawl space. The latter is a hollow area between the ground and the floor that's inconspicuous and convenient for installation of air conditioning, electrical wiring, and plumbing. The crawl space should be well insulated to help maintain your home's energy efficiency. Proper insulation also helps preserve the air quality by reducing heat and cool air losses through the floor. This information is a summary found on Waterproofing Saint Louis Pros website.