You'll want to do everything you can to warm up your home in winter, but should you cover your crawl space vents? Let's look ...

A house in winter has a snowy hard and is surrounded by snow-covered trees - Don Mason/Getty Images ...

Older homes in the South were typically built over a crawl space rather than a finished basement. Even today, many homes don't include a finished basement because of our damp, Southern soils.

Crawl-space vents were designed to allow airflow under the house, in theory releasing hot and humid air to keep mold at bay and protect the foundation from crumbling. But what about when winter rolls ...